DNS and email security scanner with 82 MCP tools for SPF, DMARC, DNSSEC, SSL, and brand audits.
Connect Remote server
claude mcp add --transport http dns https://dns-mcp.blackveilsecurity.com/mcp{
"mcpServers": {
"dns": {
"url": "https://dns-mcp.blackveilsecurity.com/mcp"
}
}
}{
"servers": {
"dns": {
"type": "http",
"url": "https://dns-mcp.blackveilsecurity.com/mcp"
}
}
}Settings > Connectors > Add custom connector
URL: https://dns-mcp.blackveilsecurity.com/mcpTools 80 found in our last check
get_access_contextRead the effective authentication context for this request: tier, owner-IP-gate disposition, a keyed pseudonymous principal reference, server version and observation time. Performs no target checks or quota/session/cache/job writes. An unavailable result is not anonymous/free fa…
check_mxLook up MX records for a domain. Identifies which mail servers receive inbound email for the domain and which email hosting provider is used (Google Workspace, Microsoft 365, Proofpoint, etc.). Use when asked which email provider hosts inbound mail for a domain, or to see MX rec…
check_spfLook up and validate the SPF record for a domain. Lists all IP addresses and third-party senders authorised to send email on behalf of the domain, flags syntax errors, and shows the trust surface (which mail servers are whitelisted). Use when you need to know who is permitted to…
check_dmarcLook up and validate a domain's DMARC record: enforcement level (none/quarantine/reject), alignment mode, and aggregate/forensic reporting destinations. Use to find a domain's DMARC enforcement, whether it sends aggregate reports, or whether it is protected against email imperso…
check_dkimLook up DKIM records for a domain. Probes common selectors, validates the signing algorithm used for outgoing email (RSA-1024/2048, Ed25519), and reports key strength. Use to verify that outbound email signatures are cryptographically sound. Part of the scan_domain audit.
check_dnssecCheck DNSSEC status for a domain. Verifies whether DNS is tamper-proof and protected against cache poisoning and DNS spoofing attacks by validating DNSKEY and DS records. Reports whether DNSSEC is enabled and validating. Part of the scan_domain audit.
check_sslCheck HTTPS/TLS posture: reachability, HSTS, HTTP-to-HTTPS redirect, and certificate issuer, expiry, days remaining and SAN count from public CT logs (the latest LOGGED certificate, which may differ from the one served). TLS protocol versions and cipher suites are not assessed.…
check_mta_stsCheck whether a domain enforces SMTP TLS for inbound mail via MTA-STS, protecting against downgrade attacks. Queries _mta-sts.<domain> and fetches the policy file, reports mode (enforce/testing/none) and MX coverage. Use to verify whether inbound SMTP is protected against TLS do…
check_nsAudit a domain’s nameserver delegation and redundancy. Identifies the DNS hosting provider and, when the infrastructure probe is available, directly compares parent and child NS sets, verifies authoritative AA responses, and checks required glue addresses. Use to detect stale re…
check_caaLook up CAA records for a domain. Shows which Certificate Authorities are authorized to issue certificates. Part of the scan_domain audit.
check_bimiCheck the BIMI record at default._bimi.<domain>: validates the logo URL (l=), the presence of mark-certificate authority evidence (a=; a bare URL, so VMC vs CMC is not determined), and the DMARC enforcement prerequisite (p=quarantine/reject) mail clients require. Use to assess b…
check_tlsrptCheck whether a domain has SMTP TLS Reporting (TLS-RPT) configured. Queries _smtp._tls.<domain> for the v=TLSRPTv1 record and validates its reporting destination (rua= mailto:/https:), flagging a missing record, duplicate records, or an invalid/absent reporting URI. Complements…
check_http_securityAudit browser-facing HTTP security headers over HTTPS: Content-Security-Policy (unsafe-inline/unsafe-eval/wildcards), X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy and COOP/COEP/CORP; also detects CDN/WAF interception. Returns per-header findings f…
check_daneCheck DANE/TLSA pinning for SMTP: looks up TLSA records at _25._tcp.<mx-host> for each MX and validates their fields and DNSSEC backing. Records are reported present but UNVERIFIED: there is no port-25 certificate probe, so a pin is never compared to the certificate actually ser…
check_ptrVerify forward-confirmed reverse DNS (PTR/FCrDNS) for mail servers. Part of the scan_domain audit.
check_dane_httpsVerify DANE/TLSA pinning for HTTPS (port 443): looks up TLSA records at _443._tcp.<domain> and validates fields and DNSSEC backing. Reported present but UNVERIFIED in every deployment: comparison with the served certificate is withdrawn (the probe cannot observe the origin certi…
check_svcb_httpsValidate HTTPS/SVCB records (RFC 9460) for modern transport capability advertisement. Part of the scan_domain audit.
check_lookalikesDetect active typosquat and lookalike/homoglyph domains that impersonate your brand and could be used in phishing. Identifies character-substitution and visual-confusion domains registered by attackers. Distinct from check_shadow_domains (TLD variants with auth gaps) and discove…
check_subdomailingDetect SubdoMailing risk: analyzes the SPF include chain for dangling or hijackable subdomains that could let an attacker send email as the domain. Use when you want to know if an SPF include chain can be hijacked through a dangling domain, or to detect subdomain mailing risk hi…
scan_domainRun a full DNS and email security audit for one domain across every scan-included check (SPF, DKIM, DMARC, DNSSEC and more); returns an overall score, NIST-aligned letter grade (A+ to F), maturity stage and prioritized findings. Use for a comprehensive audit, overall grade or em…
batch_scanBulk-scan up to 10 domains in parallel with a full security audit each; returns score, NIST-aligned letter grade (A+ to F) and finding counts per domain. Use to audit several domains at once; use compare_domains for a side-by-side comparison of 2-5 domains. scoringModelVersion (…
batch_scan_startStart a durable asynchronous scan of 1–10 domains. Returns a stable job ID; replaying the same idempotency key with the same principal, normalized inputs, and scoring versions returns the same job.
batch_scan_statusRead the owner-scoped status of an asynchronous batch scan.
batch_scan_findingsFetch owner-scoped findings for a completed asynchronous batch scan.
compare_domainsSide-by-side security comparison of 2–5 domains. Shows relative scores, category gaps, and unique weaknesses for each domain. Use when comparing your security posture against a competitor, or doing a head-to-head comparison between multiple domains.
compare_baselineCompare a domain's current security configuration against a fixed policy baseline to determine compliance. Use to check whether a domain meets a policy requirement — not for tracking improvement/regression over time (use analyze_drift) and not for comparing multiple domains (use…
check_shadow_domainsFind alternate TLD variants of a domain (e.g. example.net, example.co) that have weak or missing email authentication and could be used to spoof email. Use when asked about TLD variants with email auth gaps — distinct from check_lookalikes which detects typosquat/homoglyph imper…
check_txt_hygieneAudit TXT records for stale entries and SaaS exposure.
check_mx_reputationCheck whether the mail server (MX) IP addresses are listed on spam blocklists (Spamhaus, Barracuda, SORBS, and other RBLs). Also verifies reverse DNS for MX hosts. Use when you want to know if your mail server IP is blacklisted, or if your MX is on any blocklist — distinct from…
check_srvMap a domain's DNS-visible service footprint by probing 19 common SRV prefixes (email, calendar, messaging, directory, web) in parallel; returns discovered services and flags insecure advertisements such as plaintext IMAP/POP3/LDAP with no encrypted variant. No match among probe…
check_zone_hygieneAudit DNS zone hygiene: identifies sensitive or forgotten subdomains exposed in DNS, stale SOA records, and zone propagation issues. Use to find any sensitive subdomains that should not be publicly visible, or to audit overall DNS zone cleanliness.
generateGenerate a DNS/email security remediation artifact. Artifact types: spf_record (build a new SPF record), dmarc_record (create a DMARC policy), dkim_config (DKIM key setup), mta_sts_policy (generate an MTA-STS policy file), fix_plan (prioritized remediation plan for all findings)…
get_domain_rankRank a domain against its country or global cohort using the GSI benchmark corpus. Accepts a domain score (from scan_domain) and optional country/sector; returns a percentile: "scores better than X% of peers". Owner-gate exempt — public cohort data only.
get_benchmarkGet industry benchmark data: shows what percentile a domain's security score ranks at within its sector or country cohort, the mean score, and the most common DNS security failures across the industry. Use when asked how a score compares to the industry average, what percentile…
get_provider_insightsGet security benchmarks and common configuration issues for a specific email or DNS service-provider cohort (e.g. Google Workspace customers, Microsoft 365 customers). Use when asked how an email service provider compares to competitors on security posture, or to see typical mis…
assess_spoofabilityCompute a composite email spoofability risk score (0-100, higher = more spoofable) from SPF trust surface, DMARC enforcement and DKIM coverage. Returns a risk level (minimal to critical), per-control sub-scores and a plain-language summary. Use when asked how easy it is to spoof…
check_resolver_consistencyCheck DNS consistency across 4 public resolvers.
explain_findingExplain a finding with impact and remediation.
map_supply_chainMap DNS-visible third-party service dependencies for a domain. Correlates SPF, NS, TXT verifications, SRV services, and CAA records to reveal which third-party vendors can send email as the domain, control DNS, or access integrated services. Use when asked to map third-party or…
analyze_driftMeasure whether a domain's DNS security posture improved or regressed versus a prior scan snapshot; returns a drift classification (improving/stable/regressing/mixed), score delta, and lists of improvements and regressions. Use for "did our score improve or regress since last ti…
validate_fixRe-check a specific security control after applying a fix, to confirm the finding is now resolved. Use only when a fix has already been applied and you want to verify or confirm the remediation was successful — not for initial inspection of a record.
resolve_spf_chainTrace the full SPF include chain for a domain. Recursively resolves all includes, shows lookup count, tree depth, and flags circular includes or exceeding the 10-lookup limit.
discover_subdomainsFind subdomains via Certificate Transparency logs to reveal shadow IT and forgotten services. Returns a CT SAMPLE, not an asset inventory: counts are a lower bound, hosts without a logged certificate never appear, and a per-source `coverage` record states what was consulted. `co…
map_complianceMap scan findings to compliance frameworks: NIST 800-177, PCI DSS 4.0, SOC 2, CIS Controls. Shows pass/fail/partial status per control.
sge_quickscanCheck whether ONE domain meets the New Zealand Secure Government Email (SGE) requirements due October 2026. Reports seven controls (DMARC p=reject, SPF -all, DKIM, SMTP transport TLS, MTA-STS enforce, TLS-RPT, sub-domain coverage) as satisfied, not satisfied or NOT MEASURED, wit…
prioritize_portfolio_leadsRank a brand’s portfolio (or an explicit domain set) into prioritized registrar-partner sales leads by product-gap value × severity. Multi-domain, paid. Reuses map_registrar_products per domain, then ranks. Distinct from map_registrar_products (per-domain product mapping) and ba…
simulate_attack_pathsAnalyze current DNS posture and enumerate specific attack paths an adversary could exploit, with severity, feasibility, steps, and mitigations.
check_dblCheck domain reputation against DNS-based Domain Block Lists (Spamhaus DBL, URIBL, SURBL). Returns listing status with decoded return codes.
check_rblCheck MX server IP reputation against 6 DNS-based Real-time Blocklists (SpamCop, UCEProtect, Mailspike, Barracuda, PSBL). Resolves MX hosts to IPs first.
cymru_asnMap domain IPs to Autonomous System Numbers via Team Cymru DNS. Returns ASN, prefix, country, registry, and organization for each IP. Flags high-risk hosting ASNs.
rdap_lookupFetch domain registration data via RDAP (modern WHOIS replacement). Returns the domain registrar (the company the domain was registered with), registrant contact, creation/expiration dates, EPP status codes, and domain age. Use when asked who registered the domain, who the regis…
check_realtime_threat_feedCheck a domain against BlackVeil real-time threat intelligence (curated intel-gateway feed). Distinct from DNSBL checks. Operator-deploy only; degrades to info when unprovisioned.
check_nsec_walkabilityAssess zone walkability risk by analyzing NSEC3PARAM configuration. Detects plain NSEC zones, weak NSEC3 parameters, and opt-out flags.
check_dnssec_chainWalk the full DNSSEC chain of trust from the DNS root down to the target domain, tracing DS/DNSKEY records and algorithm usage at each zone level. Use when asked to trace the chain of trust from the DNS root, or to see the full DNSSEC delegation path step by step.
check_agent_discoveryAssess IETF BANDAID agent-discovery DNS records: finds SVCB agent records under _agents, reports whether the discovery zone is DNSSEC-anchored (unsigned means spoofable endpoints), evaluates DANE/TLSA binding trust and checks capability-document integrity (cap / cap-sha256). Rea…
check_llms_txtInspect a domain's /llms.txt and /llms-full.txt for links and install commands an AI agent could inherit. Sweeps external link hosts for dangling CNAMEs and deprovisioned-service fingerprints (evidence, not proof it is claimable) and checks npm/PyPI install package names for unr…
check_dnskey_strengthAudit DNSKEY signing algorithms used for DNSSEC: reports the algorithm in use (RSA/SHA-1, RSA/SHA-256, ECDSA P-256, Ed25519, etc.) and flags deprecated ones (RSA/SHA-1, DSA), independent of whether the chain validates. Use when asked which algorithm signs DNSSEC keys or if depre…
check_fast_fluxDetect fast-flux DNS behavior: performs multiple rounds of A/AAAA queries and checks whether IP addresses are rotating rapidly on each DNS query (a sign of botnet or malicious infrastructure). Compares IP answer sets and TTLs across rounds to identify rapidly rotating infrastruc…
check_subdomain_takeoverSweep subdomains for dangling CNAMEs pointing at deprovisioned cloud services an attacker could claim (subdomain takeover); detects 16 provider families such as AWS S3/CloudFront, Azure, GCP Storage, Heroku, GitHub Pages, Vercel and Firebase. Use when asked if subdomains point t…
check_authoritative_dns_infraMeasure a hostname's authoritative DNS posture by querying its nameservers directly over TCP/53 from one vantage: reachability, AA flag, recursion exposure, SOA serial consistency, DNSKEY/RRSIG presence (not validation), IPv4/IPv6 parity. Authenticated callers also get a zone-tr…
check_root_server_setQuery a rotating sample of 3 root servers per call and compare the priming NS set, glue, SOA serials, and cross-root consistency against the embedded official root hints. Uses BV_INFRA_PROBE when available; without it, returns the embedded hints as reference data only.
discover_brand_domainsDiscover all domains that belong to a brand's portfolio by aggregating certificate, DNS, redirect, and mail-policy signals. Use when asked what domains are part of a brand portfolio, or to find all domains related to a brand. Pass the EXACT seed domain verbatim — do NOT normaliz…
discover_brand_domains_startStart an async brand-domain discovery for the EXACT seed domain provided (the async sibling of discover_brand_domains, which can run ~24s and time out interactive clients). Same args as discover_brand_domains. Returns { auditId, queuedAt, etaSeconds } immediately; poll with disc…
discover_brand_domains_statusPoll the status of an async brand-domain discovery started with discover_brand_domains_start. Returns status (queued | running | completed | failed) and progress. Owner-scoped — operationIds owned by other principals surface as notFound.
discover_brand_domains_findingsFetch the ranked candidate domains (the discovery CheckResult) for an async run started with discover_brand_domains_start. Returns notReady while the discovery is still in-flight; the discovery result once complete. Owner-scoped.
brand_audit_singleRun a full brand audit on one target (optional standard/deep depth, brand aliases, candidate domains). Discovers brand-related domains, looks up registrar and registrant, and classifies each as consolidated, shadowIt, authorized vendor, indeterminate or impersonation. Gated by m…
brand_audit_batch_startEnqueue an async brand audit across up to 50 target domains with optional standard/deep discovery depth, brand aliases, and caller-supplied candidate domains. Returns { auditId, queuedAt, targetCount, etaSeconds } immediately; poll with brand_audit_status and fetch results with…
brand_audit_statusPoll the status of an enqueued brand audit. Returns audit-level status (queued | running | completed | failed), progress 'N/M', and per-target statuses. Owner-scoped — auditIds owned by other principals surface as notFound.
brand_audit_get_reportFetch the result JSON of a completed brand audit: the per-target CheckResult when `target` is set, else the audit-level aggregate; returns notReady while in flight. When a PDF sidecar exists, metadata includes pdfUrl, an authenticated /reports/ download link (same bearer credent…
list_brand_audit_watchesReturns the caller's recurring brand-audit watches: watchId, domain, interval, webhook presence, last-run time, and active state. Owner-scoped. Read-only.
register_brand_audit_watchCreates a recurring brand-audit watch for a domain on a daily/weekly/monthly cadence. Each run enqueues a fresh brand_audit_batch_start and (when a webhook is configured) POSTs a diff webhook on classification drift. Returns the new watchId. Owner-scoped; per-principal cap of 20…
delete_brand_audit_watchPermanently removes a recurring brand-audit watch by watchId. Owner-scoped — a watchId owned by another principal surfaces as notFound. Returns confirmation of deletion.
scan_buckets_startStart an async cloud-bucket discovery scan for a target domain. Operator-deploy only; targets must be operator-authorized on the recon watchlist; degrades to info when unprovisioned. Returns a scanId immediately — poll progress with scan_buckets_status and retrieve results with…
scan_buckets_statusPoll the status of a cloud-bucket discovery scan by scanId. Operator-deploy only; targets must be operator-authorized on the recon watchlist; degrades to info when unprovisioned. Returns scan status (running | completed | failed) and progress metadata.
scan_buckets_findingsRetrieve findings from a completed cloud-bucket discovery scan by scanId. Operator-deploy only; targets must be operator-authorized on the recon watchlist; degrades to info when unprovisioned. The scanId is required so reads can be owner-scoped; target and provider filters are o…
osint_investigate_domain_startStart an async OSINT investigation for a domain. Operator-deploy only; targets must be operator-authorized on the recon watchlist; degrades to info when unprovisioned. Returns an investigationId immediately — poll with osint_investigation_status and retrieve results with osint_i…
osint_investigate_infrastructure_startStart an async deep-infrastructure OSINT investigation for a query (domain, IP, or org). Operator-deploy only; targets must be operator-authorized on the recon watchlist; degrades to info when unprovisioned. Returns an investigationId immediately — poll with osint_investigation_…
osint_investigate_supply_chain_startStart an async supply-chain OSINT investigation for a query. Operator-deploy only; targets must be operator-authorized on the recon watchlist; degrades to info when unprovisioned. Returns an investigationId immediately — poll with osint_investigation_status.
osint_investigate_username_startStart an async OSINT investigation for a username (cross-platform presence, breach correlation). Owner/enterprise tier only — people-centric OSINT is restricted to prevent misuse. Returns an investigationId immediately — poll with osint_investigation_status and retrieve results…
osint_investigate_email_startStart an async OSINT investigation for an email address (breach exposure, account correlation). Owner/enterprise tier only — people-centric OSINT is restricted to prevent misuse. Returns an investigationId immediately — poll with osint_investigation_status and retrieve results w…
Details
| Endpoint | https://dns-mcp.blackveilsecurity.com/mcp (Streamable HTTP) |
| First published | 13 Nov 2026 |
| Last updated | 13 Nov 2026 |
| Registry name | com.blackveilsecurity/dns |
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