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DNS Tool
Engineer's DNS Intelligence Report
Generated 17 Feb 2026, 18:29 UTC
Duration 21.1s
Version v26.19.22
Integrity 8b57a8506c1dd54dbbc95ce87c2a757ad3a21cd9d4697be28afb17b511219b3875910eec1bf4b9941bdcad9ba0dad26743f6ac5736a2de41cf113455aace03b7
Subject Domain
zmacnashville.net

Engineer's DNS Intelligence Report

zmacnashville.net
17 Feb 2026, 18:29 UTC · 21.1s ·v26.19.22 · SHA-3-512: 8b57✱✱✱✱ Verify
Executive Methodology
Recon Mode Snapshot Re-analyze New Domain
Footprint Google Workspace
DNS Security & Trust Posture
Risk Level: Medium Risk
3 protocols configured, 5 not configured, 1 unavailable on provider Why we go beyond letter grades
1 recommendation 2 monitoring
Suggested Scanner Configuration High Confidence
Based on 15 historical scans of this domain
Parameter Current Suggested Severity Rationale
timeout_seconds 5s 8s low Average scan duration is 45.0s, suggesting DNS responses are slow for this domain. Increasing timeout from 5s to 8s prevents premature resolution failures.
RFC 8767
Suggestions require explicit approval before applying. No automatic changes will be made.
Email Spoofing
Partial
Brand Impersonation
Not Setup
DNS Tampering
Unsigned
Certificate Control
Open
Recommended
Enable DMARC aggregate reporting (rua) for authentication visibility
Monitoring
DMARC record has configuration warnings — review recommended, DKIM signing inferred from provider — could not directly verify selector
Configured
SPF, DMARC (with warnings), DKIM (inferred via Google Workspace)
Not Configured
MTA-STS, TLS-RPT, BIMI, DNSSEC, CAA
Unavailable on Provider
DANE
Priority Actions 5 total Achievable posture: Secure
Medium Add DMARC Aggregate Reporting

Add a rua= tag to receive aggregate DMARC reports. Without reporting, you cannot monitor authentication failures.

Aggregate reports show who is sending mail as your domain and whether it passes authentication.
TypeTXT
Host_dmarc.zmacnashville.net (add to existing DMARC record)
Valuerua=mailto:dmarc-reports@zmacnashville.net
RFC 7489 §7.1
Medium Enable DNSSEC

DNSSEC is not enabled for this domain. DNSSEC provides cryptographic authentication of DNS responses, preventing cache poisoning and DNS spoofing attacks.

RFC 4035
Low Add CAA Records

CAA records specify which Certificate Authorities may issue certificates for your domain, reducing the risk of unauthorized certificate issuance.

CAA constrains which CAs can issue certificates for this domain.
TypeCAA
Hostzmacnashville.net (root of domain — adjust CA to match your provider)
Value0 issue "letsencrypt.org"
RFC 8659
Low Add TLS-RPT Reporting

TLS-RPT (TLS Reporting) sends you reports about TLS connection failures when other servers try to deliver mail to your domain.

TLS-RPT sends you reports about TLS connection failures to your mail servers.
TypeTXT
Host_smtp._tls.zmacnashville.net (SMTP TLS reporting record)
Valuev=TLSRPTv1; rua=mailto:tls-reports@zmacnashville.net
RFC 8460
Low Deploy MTA-STS

MTA-STS enforces TLS encryption for inbound mail delivery, preventing downgrade attacks on your mail transport.

MTA-STS tells sending servers to require TLS when delivering mail to your domain.
TypeTXT
Host_mta-sts.zmacnashville.net (MTA-STS policy record)
Valuev=STSv1; id=zmacnashville.net
RFC 8461
Registrar (RDAP) OBSERVED LIVE
GoDaddy.com, LLC
Where domain was purchased
Email Service Provider
Unknown
Moderately Protected
Web Hosting
Unknown
Where website is hosted
DNS Hosting
Unknown
Where DNS records are edited
Email Security Methodology Can this domain be impersonated by email? Uncertain incomplete configuration

SPF Record RFC 7208 §4 Verified

Does this domain declare who may send email on its behalf? Yes
Success ~all 1/10 lookups

SPF valid with industry-standard soft fail (~all), 1/10 lookups

v=spf1 include:dc-aa8e722993._spfm.zmacnashville.net ~all
RFC 7208 Conformant — This SPF record conforms to the syntax and semantics defined in RFC 7208 §4.
RFC Failure Mode: Unlike DMARC (where unknown tags are silently ignored per RFC 7489 §6.3), SPF with unrecognized mechanisms produces a PermError per RFC 7208 §4.6 — the record fails loudly rather than silently.
Related CVEs: CVE-2024-7208 (multi-tenant domain spoofing), CVE-2024-7209 (shared SPF exploitation), CVE-2023-51764 (SMTP smuggling bypasses SPF)
~all is the industry standard. Google, Apple, and most providers default to soft fail. CISA (BOD 18-01) and RFC 7489 confirm that DMARC policy — not SPF alone — is the primary enforcement control. Using ~all allows DKIM to be evaluated before a DMARC decision is made.

DMARC Policy RFC 7489 §6.3 Verified

Are spoofed emails rejected or quarantined? No policy published
Warning

No DMARC record found

RFC 7489 Present — DMARC record published per RFC 7489 §6.3.
DMARCbis (Pending): draft-ietf-dmarc-dmarcbis will elevate DMARC to Standards Track, obsolete RFC 7489, replace pct= with t= (testing flag), add np= (non-existent subdomain policy), and mandate DNS tree walk for policy discovery instead of the Public Suffix List.
Related CVEs: CVE-2024-49040 (Exchange sender spoofing), CVE-2024-7208 (multi-tenant DMARC bypass)

DKIM Records RFC 6376 §3.6 Verified

Are outbound emails cryptographically signed? Provider-managed
Provider Verified

DKIM not discoverable via common selectors (large providers use rotating selectors)

Google Workspace detected as primary mail platform — DKIM signing is managed by the provider. The primary provider may use custom selectors not discoverable through standard checks.
Know your DKIM selector? Re-scan with a custom selector to verify.
RFC 6376 (Provider-Managed) — DKIM signing managed by the detected mail provider per RFC 6376.
Known Vulnerabilities: DKIM l= tag body length vulnerability (attacker appends unsigned content to signed mail), weak key exploitation (keys below 1024-bit are cryptographically breakable per RFC 6376 §3.3.3), DKIM replay attacks (re-sending legitimately signed messages at scale)

MTA-STS RFC 8461 §3 Verified

Can attackers downgrade SMTP to intercept mail? Not prevented
Warning

No MTA-STS record found

MTA-STS policy enforcement is evaluated in Mail Transport Security below.

TLS-RPT RFC 8460 §3 Verified

Will failures in TLS delivery be reported? No reporting
Warning

No TLS-RPT record found

DANE / TLSA Verified Recon Methodology Can mail servers establish identity without a public CA? No
RFC 7672 §3 RFC 6698 §2 Not Available

DANE not available — Google Workspace does not support inbound DANE/TLSA on its MX infrastructure

DANE not deployable on Google Workspace

Google Workspace supports DANE for outbound mail verification but does not publish TLSA records for its MX hosts.

Recommended alternative: MTA-STS

Note: Google Workspace does validate DANE/TLSA when sending mail to DANE-enabled recipients (outbound DANE).

Email Transport Security

Two mechanisms protect email in transit. DANE is the primary standard; MTA-STS is the alternative for domains that cannot deploy DNSSEC:

  • DNSSEC + DANE (RFC 7672) — Cryptographic chain of trust from DNS root to mail server certificate. Eliminates reliance on certificate authorities. No trust-on-first-use weakness. Requires DNSSEC.
  • MTA-STS (RFC 8461) — HTTPS-based policy requiring TLS for mail delivery. Works without DNSSEC but relies on CA trust and is vulnerable on first use (§10). Created for domains where “deploying DNSSEC is undesirable or impractical” (§2).
This domain has neither DANE nor MTA-STS. Since Google Workspace does not support inbound DANE, deploy MTA-STS (RFC 8461) to enforce TLS and protect against downgrade attacks.

Industry trend: Microsoft Exchange Online enforces inbound DANE with DNSSEC (GA October 2024), and providers like Proton Mail and Fastmail also support DANE. Google Workspace does not support DANE and relies on MTA-STS. Both mechanisms coexist because DANE is backward-compatible — senders skip the check if the domain isn't DNSSEC-signed (RFC 7672 §1.3).

Brand Security Can this brand be convincingly faked? Partially DMARC policy is not set to reject — partial protection only

BIMI BIMI Spec Verified Warning

Is the brand identity verified and displayed in inboxes? No

No BIMI record found

CAA RFC 8659 §4 Verified Warning

Does this domain restrict who can issue TLS certificates? No

No CAA records found - any CA can issue certificates

Vulnerability Disclosure Policy (security.txt) Is there a verified way to report security issues? No RFC 9116

No security.txt found

A security.txt file at /.well-known/security.txt provides security researchers with a standardized way to report vulnerabilities. See securitytxt.org for a generator.
AI Surface Scanner Beta Is this domain discoverable by AI — and protected from abuse? No

No significant AI surface findings

llms.txt llmstxt.org
Is this domain publishing AI-readable brand context? No
No llms.txt found
No llms-full.txt found
AI Crawler Governance (robots.txt) RFC 9309 IETF Draft
Are AI crawlers explicitly allowed or blocked? No directives
No robots.txt found
Content-Usage Directive IETF Draft
Does the site express AI content-usage preferences? Not Configured
No Content-Usage directive detected. The IETF AI Preferences working group is developing a Content-Usage: directive for robots.txt that lets site owners declare whether their content may be used for AI training and inference. This is an active draft, not yet a ratified standard.
Example: Add Content-Usage: ai=no to robots.txt to deny AI training, or Content-Usage: ai=allow to explicitly permit it. Without this directive, AI crawler behavior depends on individual crawler policies and User-agent rules.
AI Recommendation Poisoning
Is this site trying to manipulate AI recommendations? No
No AI recommendation poisoning indicators found
Hidden Prompt Artifacts
Is hidden prompt-injection text present in the source? No
No hidden prompt-like artifacts detected
Public Exposure Checks Are sensitive files or secrets exposed? No

No exposed secrets detected in public page source — same-origin, non-intrusive scan of publicly visible page source and scripts.

No exposed secrets, API keys, or credentials were detected in publicly accessible page source or scripts.
Sources scanned (1)
  • https://zmacnashville.net/
What type of scan is this?

This is OSINT (Open Source Intelligence) collection — we check the same publicly accessible URLs that any web browser could visit. No authentication is bypassed, no ports are probed, no vulnerabilities are exploited.

Is this a PCI compliance scan? No. PCI DSS requires scans performed by an Approved Scanning Vendor (ASV) certified by the PCI Security Standards Council. DNS Tool is not an ASV. If you need PCI compliance scanning, engage a certified ASV such as Qualys, Tenable, or Trustwave.

Is this a penetration test? No. Penetration testing involves active exploitation attempts against systems with authorization. Our checks are passive observation of publicly accessible resources — the same methodology used by Shodan, Mozilla Observatory, and other OSINT platforms.

Mail Transport Security Beta Is mail transport encrypted and verified? No No MTA-STS or DANE — mail transport encryption is opportunistic only

Transport security inferred from 1 signal(s) — no enforcement policy active

Policy Assessment Primary
  • Google Workspace enforces TLS 1.2+ with valid certificates on all inbound/outbound mail
Telemetry
TLS-RPT not configured — domain has no visibility into TLS delivery failures from real senders
Live Probe Supplementary
Skipped — SMTP probe skipped — outbound TCP port 25 is blocked by cloud hosting provider. This is standard for all major cloud platforms (AWS, GCP, Azure, Replit) as an anti-spam measure. Transport security is assessed via DNS policy records above, which is the standards-aligned primary method per NIST SP 800-177 Rev. 1.
Infrastructure Intelligence Who hosts this domain and what services power it? Direct

ASN / Network Success

Resolved 1 unique ASN(s) across 1 IP address(es)

ASNNameCountry
AS26496 US
IPv4 Mappings:
208.109.41.234 → AS26496 (208.109.32.0/19)

Edge / CDN Success

Domain appears to use direct origin hosting

SaaS TXT Footprint Success

No SaaS services detected

Detects SaaS services that leave DNS TXT verification records (e.g., domain ownership proofs). Does not detect all SaaS platforms — only those indicated by DNS.

Domain Security Methodology Can DNS responses be tampered with in transit? Possible DNSSEC is not deployed, DNS responses are not cryptographically verified

DNSSEC RFC 4033 §2 Verified Unsigned

DNSSEC not configured - DNS responses are unsigned

Domain does not use DNSSEC. Enable in your registrar's DNS settings (look for "DNSSEC" or "DS records" section).

NS Delegation Verified

2 nameserver(s) configured

Nameservers: ns63.domaincontrol.com ns64.domaincontrol.com
Multi-Resolver Verification Recon: Consensus reached - 4 resolvers (Cloudflare, Google, Quad9, OpenDNS, DNS4EU) agree on DNS records
Traffic & Routing Where does this domain's traffic actually terminate?

AIPv4 Address

208.109.41.234
Where the domain points for web traffic

AAAAIPv6 Address

No AAAA records
IPv6 not configured

MXMail Servers

10 alt4.aspmx.l.google.com.
1 aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
Priority + mail server for email delivery

SRVServices

No SRV records
No service-specific routing configured
Web: Reachable (1 IPv4, 0 IPv6) Mail: 5 servers Services: None
Subdomain Discovery RFC 6962 Recon LIVE What subdomains and infrastructure are exposed in certificate logs? 4 subdomains discovered
How did we find these?
Certificate Transparency Logs Unavailable The results below are from DNS probing only and may be significantly incomplete. CT logs typically reveal hundreds or thousands of additional subdomains via certificate issuance history (RFC 6962).
Re-Analyze to Retry CT Lookup
CT logs unavailable 4 current 0 expired 2 CNAMEs Source: Certificate Transparency + DNS Intelligence
Subdomains discovered via CT logs (RFC 6962), DNS probing of common service names, and CNAME chain traversal.
Subdomain Source Status Provider / CNAME Certificates First Seen Issuer(s)
admin.zmacnashville.net DNS Current — — — —
cpanel.zmacnashville.net DNS Current zmacnashville.net — — —
mail.zmacnashville.net DNS Current — — — —
www.zmacnashville.net DNS Current zmacnashville.net — — —
Export Recon (CSV)
Δ No Propagation Issues: All DNS records are synchronized between resolver and authoritative nameserver.
DNS Intelligence What does DNS look like right now — and what changed over time?
DNS Evidence Diff Side-by-side comparison
Resolver Records (Public DNS cache)
Authoritative Records (Source of truth)
A Synchronized 1 / 1 records
208.109.41.234
208.109.41.234
AAAA 0 / 0 records
No records
No records
CAA RFC 8659 §4 0 / 0 records
No records
No records
MX RFC 5321 Synchronized 5 / 5 records
10 alt4.aspmx.l.google.com.
1 aspmx.l.google.com.
1 aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
10 alt4.aspmx.l.google.com.
NS RFC 1035 Synchronized 2 / 2 records
ns64.domaincontrol.com.
ns63.domaincontrol.com.
ns63.domaincontrol.com.
ns64.domaincontrol.com.
SOA RFC 1035 Synchronized 1 / 1 records
ns63.domaincontrol.com. dns.jomax.net. 2024071803 28800 7200 604800 600
ns63.domaincontrol.com. dns.jomax.net. 2024071803 28800 7200 604800 600
TXT RFC 7208 §4 Synchronized 2 / 2 records
v=spf1 include:dc-aa8e722993._spfm.zmacnashville.net ~all
google-site-verification=08FOl5aM_SQpAyOWMfPuhcG2umduF0bxdVdIUw-PykM
google-site-verification=08FOl5aM_SQpAyOWMfPuhcG2umduF0bxdVdIUw-PykM
v=spf1 include:dc-aa8e722993._spfm.zmacnashville.net ~all
DNS History Timeline BETA
Your key is sent directly to SecurityTrails and is never stored on our servers. Get an API key
DNS History Timeline BETA

When was a record added, removed, or changed — and could that change be the problem?

Analyze Another Domain

Confirm Your Email Configuration

This tool analyzes DNS records, but to verify actual email delivery, send a test email to Red Sift Investigate. Their tool shows exactly how your emails arrive, including SPF/DKIM/DMARC pass/fail results in the headers.

DATA FRESHNESS & METHODOLOGY

All security-critical records (SPF, DMARC, DKIM, DANE/TLSA, DNSSEC, MTA-STS, TLS-RPT, BIMI, CAA) are queried live from authoritative nameservers and cross-referenced against 5 independent public DNS resolvers (Cloudflare, Google, Quad9, OpenDNS, DNS4EU) at the time of each analysis. No security verdict uses cached data.

Registrar data (RDAP) is cached for up to 24 hours because domain ownership and registration details change infrequently. Certificate Transparency logs (subdomain discovery via RFC 6962) are cached for 1 hour because CT entries are append-only historical records. Sections using cached data are marked with a CACHED badge; live queries show LIVE.

Intelligence Sources

This analysis used 4 DNS resolvers (consensus), reverse DNS (PTR), Team Cymru (ASN attribution), IANA RDAP (registrar), crt.sh (CT logs), and SMTP probing (transport). All using open-standard protocols.

Full List
Verify Report Integrity SHA-3-512 Has this report been altered since generation? Verify below

This cryptographic hash seals the analysis data, domain, timestamp, and tool version into a tamper-evident fingerprint. Any modification to the report data will produce a different hash. This is distinct from the posture hash (used for drift detection) — the integrity hash uniquely identifies this specific report instance.

8b57a8506c1dd54dbbc95ce87c2a757ad3a21cd9d4697be28afb17b511219b3875910eec1bf4b9941bdcad9ba0dad26743f6ac5736a2de41cf113455aace03b7
Evaluations reference 12 RFCs. Methods are reproducible using the verification commands provided. Results reflect DNS state at 17 Feb 2026, 18:29 UTC.
Download Raw Intelligence Download Checksum (.sha3)

Download the intelligence dump and verify its integrity, like you would a Kali ISO or any critical artifact. The SHA-3-512 checksum covers every byte of the download — deterministic serialization ensures identical hashes across downloads.

After downloading, verify with any of these commands:

Tip: cd ~/Downloads first (or wherever you saved the files).

OpenSSL + Sidecar (macOS, Linux, WSL) 
cat dns-intelligence-zmacnashville.net.json.sha3 && echo '---' && openssl dgst -sha3-512 dns-intelligence-zmacnashville.net.json
Python 3 (cross-platform) 
python3 -c "import hashlib; print(hashlib.sha3_512(open('dns-intelligence-zmacnashville.net.json','rb').read()).hexdigest())"
sha3sum (coreutils 9+) 
sha3sum -a 512 dns-intelligence-zmacnashville.net.json
Compare the output against the .sha3 file or the checksum API at /api/analysis/1379/checksum. Hash algorithm: SHA-3-512 (Keccak, NIST FIPS 202).

Every finding in this report is backed by DNS queries you can run yourself. These vetted one-liners reproduce the exact checks used to build this report for zmacnashville.net. Our analysis adds multi-resolver consensus, RFC-based evaluation, and cross-referencing — but the underlying data is always independently verifiable. We are intelligence analysts, not gatekeepers.

DNS Records

Query A records (IPv4) RFC 1035 
dig +noall +answer zmacnashville.net A
Query AAAA records (IPv6) RFC 1035 
dig +noall +answer zmacnashville.net AAAA
Query MX records (mail servers) RFC 1035 
dig +noall +answer zmacnashville.net MX
Query NS records (nameservers) RFC 1035 
dig +noall +answer zmacnashville.net NS
Query TXT records RFC 1035 
dig +noall +answer zmacnashville.net TXT

Email Authentication

Check SPF record RFC 7208 
dig +short zmacnashville.net TXT | grep -i spf
Check DMARC policy RFC 7489 
dig +short _dmarc.zmacnashville.net TXT
Check DKIM key for selector 'default' RFC 6376 
dig +short default._domainkey.zmacnashville.net TXT
Check DKIM key for selector 'google' RFC 6376 
dig +short google._domainkey.zmacnashville.net TXT
Check DKIM key for selector 'selector1' RFC 6376 
dig +short selector1._domainkey.zmacnashville.net TXT
Check DKIM key for selector 'selector2' RFC 6376 
dig +short selector2._domainkey.zmacnashville.net TXT

Domain Security

Check DNSSEC DNSKEY records RFC 4035 
dig +dnssec +noall +answer zmacnashville.net DNSKEY
Check DNSSEC DS records RFC 4035 
dig +noall +answer zmacnashville.net DS
Validate DNSSEC chain (requires DNSSEC-validating resolver) RFC 4035 
dig +dnssec +cd zmacnashville.net A @1.1.1.1

Transport Security

Check TLSA record for alt4.aspmx.l.google.com RFC 7672 
dig +noall +answer _25._tcp.alt4.aspmx.l.google.com TLSA
Check TLSA record for aspmx.l.google.com RFC 7672 
dig +noall +answer _25._tcp.aspmx.l.google.com TLSA
Check TLSA record for alt2.aspmx.l.google.com RFC 7672 
dig +noall +answer _25._tcp.alt2.aspmx.l.google.com TLSA
Check TLSA record for alt3.aspmx.l.google.com RFC 7672 
dig +noall +answer _25._tcp.alt3.aspmx.l.google.com TLSA
Check TLSA record for alt1.aspmx.l.google.com RFC 7672 
dig +noall +answer _25._tcp.alt1.aspmx.l.google.com TLSA
Verify TLS certificate on primary MX (alt4.aspmx.l.google.com) RFC 6698 
openssl s_client -starttls smtp -connect alt4.aspmx.l.google.com:25 -servername alt4.aspmx.l.google.com 2>/dev/null | openssl x509 -noout -subject -dates
Check MTA-STS DNS record RFC 8461 
dig +short _mta-sts.zmacnashville.net TXT
Fetch MTA-STS policy file RFC 8461 
curl -sL https://mta-sts.zmacnashville.net/.well-known/mta-sts.txt
Check TLS-RPT record RFC 8460 
dig +short _smtp._tls.zmacnashville.net TXT

Brand & Trust

Check BIMI record BIMI Draft 
dig +short default._bimi.zmacnashville.net TXT
Check CAA records (certificate authority authorization) RFC 8659 
dig +noall +answer zmacnashville.net CAA

DNS Records

Check HTTPS/SVCB records RFC 9460 
dig +noall +answer zmacnashville.net HTTPS

Domain Security

Check CDS/CDNSKEY automation records RFC 7344 
dig +noall +answer zmacnashville.net CDS

Infrastructure Intelligence

RDAP domain registration lookup RFC 9083 
curl -sL 'https://rdap.org/domain/zmacnashville.net' | python3 -m json.tool | head -50

Transport Security

Test STARTTLS on primary MX (alt4.aspmx.l.google.com) RFC 3207 
openssl s_client -starttls smtp -connect alt4.aspmx.l.google.com:25 -servername alt4.aspmx.l.google.com </dev/null 2>/dev/null | head -5

Infrastructure Intelligence

Search Certificate Transparency logs RFC 6962 
curl -s 'https://crt.sh/?q=%25.zmacnashville.net&output=json' | python3 -c "import json,sys; [print(e['name_value']) for e in json.load(sys.stdin)]" | sort -u | head -20
Check security.txt RFC 9116 
curl -sL https://zmacnashville.net/.well-known/security.txt | head -20

AI Surface

Check for llms.txt 
curl -sI https://zmacnashville.net/llms.txt | head -5
Check robots.txt for AI crawler rules 
curl -s https://zmacnashville.net/robots.txt | grep -i -E 'GPTBot|ChatGPT|Claude|Anthropic|Google-Extended|CCBot|PerplexityBot'

Infrastructure Intelligence

ASN lookup for 208.109.41.234 (Team Cymru) 
dig +short 234.41.109.208.origin.asn.cymru.com TXT
Commands use dig, openssl, and curl — standard tools available on macOS, Linux, and WSL. Results may vary slightly due to DNS propagation timing and resolver caching.
Intelligence Confidence Audit Engine Verified · 9/9 Evaluated
How confident are these results? Each protocol is independently verified against RFC standards. No self-awarded badges.
SPF
Verified 4851 runs
DKIM
Verified 4670 runs
DMARC
Verified 4835 runs
DANE/TLSA
Verified 4654 runs
DNSSEC
Verified 4832 runs
BIMI
Verified 4669 runs
MTA-STS
Verified 4672 runs
TLS-RPT
Verified 4674 runs
CAA
Verified 4666 runs
Maturity: Development → Verified → Consistent → Gold → Gold Master

Appendix: Verification Commands

The core DNS queries behind this report can be independently verified using these standard terminal commands (dig, openssl, curl). DNS Tool adds multi-resolver consensus, RFC-based evaluation, and cross-referencing on top of the raw data shown here.

DNS Records

Query A records (IPv4) (RFC 1035) 
dig +noall +answer zmacnashville.net A
Query AAAA records (IPv6) (RFC 1035) 
dig +noall +answer zmacnashville.net AAAA
Query MX records (mail servers) (RFC 1035) 
dig +noall +answer zmacnashville.net MX
Query NS records (nameservers) (RFC 1035) 
dig +noall +answer zmacnashville.net NS
Query TXT records (RFC 1035) 
dig +noall +answer zmacnashville.net TXT

Email Authentication

Check SPF record (RFC 7208) 
dig +short zmacnashville.net TXT | grep -i spf
Check DMARC policy (RFC 7489) 
dig +short _dmarc.zmacnashville.net TXT
Check DKIM key for selector 'default' (RFC 6376) 
dig +short default._domainkey.zmacnashville.net TXT
Check DKIM key for selector 'google' (RFC 6376) 
dig +short google._domainkey.zmacnashville.net TXT
Check DKIM key for selector 'selector1' (RFC 6376) 
dig +short selector1._domainkey.zmacnashville.net TXT
Check DKIM key for selector 'selector2' (RFC 6376) 
dig +short selector2._domainkey.zmacnashville.net TXT

Domain Security

Check DNSSEC DNSKEY records (RFC 4035) 
dig +dnssec +noall +answer zmacnashville.net DNSKEY
Check DNSSEC DS records (RFC 4035) 
dig +noall +answer zmacnashville.net DS
Validate DNSSEC chain (requires DNSSEC-validating resolver) (RFC 4035) 
dig +dnssec +cd zmacnashville.net A @1.1.1.1

Transport Security

Check TLSA record for alt4.aspmx.l.google.com (RFC 7672) 
dig +noall +answer _25._tcp.alt4.aspmx.l.google.com TLSA
Check TLSA record for aspmx.l.google.com (RFC 7672) 
dig +noall +answer _25._tcp.aspmx.l.google.com TLSA
Check TLSA record for alt2.aspmx.l.google.com (RFC 7672) 
dig +noall +answer _25._tcp.alt2.aspmx.l.google.com TLSA
Check TLSA record for alt3.aspmx.l.google.com (RFC 7672) 
dig +noall +answer _25._tcp.alt3.aspmx.l.google.com TLSA
Check TLSA record for alt1.aspmx.l.google.com (RFC 7672) 
dig +noall +answer _25._tcp.alt1.aspmx.l.google.com TLSA
Verify TLS certificate on primary MX (alt4.aspmx.l.google.com) (RFC 6698) 
openssl s_client -starttls smtp -connect alt4.aspmx.l.google.com:25 -servername alt4.aspmx.l.google.com 2>/dev/null | openssl x509 -noout -subject -dates
Check MTA-STS DNS record (RFC 8461) 
dig +short _mta-sts.zmacnashville.net TXT
Fetch MTA-STS policy file (RFC 8461) 
curl -sL https://mta-sts.zmacnashville.net/.well-known/mta-sts.txt
Check TLS-RPT record (RFC 8460) 
dig +short _smtp._tls.zmacnashville.net TXT

Brand & Trust

Check BIMI record (BIMI Draft) 
dig +short default._bimi.zmacnashville.net TXT
Check CAA records (certificate authority authorization) (RFC 8659) 
dig +noall +answer zmacnashville.net CAA

DNS Records

Check HTTPS/SVCB records (RFC 9460) 
dig +noall +answer zmacnashville.net HTTPS

Domain Security

Check CDS/CDNSKEY automation records (RFC 7344) 
dig +noall +answer zmacnashville.net CDS

Infrastructure Intelligence

RDAP domain registration lookup (RFC 9083) 
curl -sL 'https://rdap.org/domain/zmacnashville.net' | python3 -m json.tool | head -50

Transport Security

Test STARTTLS on primary MX (alt4.aspmx.l.google.com) (RFC 3207) 
openssl s_client -starttls smtp -connect alt4.aspmx.l.google.com:25 -servername alt4.aspmx.l.google.com </dev/null 2>/dev/null | head -5

Infrastructure Intelligence

Search Certificate Transparency logs (RFC 6962) 
curl -s 'https://crt.sh/?q=%25.zmacnashville.net&output=json' | python3 -c "import json,sys; [print(e['name_value']) for e in json.load(sys.stdin)]" | sort -u | head -20
Check security.txt (RFC 9116) 
curl -sL https://zmacnashville.net/.well-known/security.txt | head -20

AI Surface

Check for llms.txt 
curl -sI https://zmacnashville.net/llms.txt | head -5
Check robots.txt for AI crawler rules 
curl -s https://zmacnashville.net/robots.txt | grep -i -E 'GPTBot|ChatGPT|Claude|Anthropic|Google-Extended|CCBot|PerplexityBot'

Infrastructure Intelligence

ASN lookup for 208.109.41.234 (Team Cymru) 
dig +short 234.41.109.208.origin.asn.cymru.com TXT
Running Multi-Source Intelligence Audit

zmacnashville.net

0s
DNS records — Cloudflare, Google, Quad9, OpenDNS, DNS4EU
Email auth — SPF, DMARC, DKIM selectors
DNSSEC chain of trust & DANE/TLSA
Certificate Transparency & subdomain discovery
SMTP transport & STARTTLS verification
MTA-STS, TLS-RPT, BIMI, CAA
Registrar & infrastructure analysis
Intelligence Classification & Interpretation

Every result includes terminal commands you can run to independently verify the underlying data. No proprietary magic.