{"uid":"cap_SN129FeK97Hcuq5DWvzaC","slug":"dns-aaaa-record-lookup-for-smtp-subdomain-55916966","name":"DNS AAAA Record Lookup for smtp Subdomain","description":"AAAA record of smtp.<domain>: looks up the smtp host under the domain you give (AAAA via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like smtp without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/smtp/aaaa?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ElJ4JTYLZWTNm9J8sB-vl","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up the IPv6 (AAAA) DNS record for the smtp.<domain> host via Cloudflare DNS-over-HTTPS and returns whether it exists, its records, and TTL.","exampleAgentPrompt":"Can you check whether smtp.example.com has an IPv6 (AAAA) DNS record — I want to know if it exists and what its TTL is?","exampleUseCases":[{"title":"Verify email server IPv6 support","prompt":"Does smtp.fastmail.com have an IPv6 address configured in DNS? I need to know if their SMTP host has an AAAA record and what the TTL is."},{"title":"Pre-flight mail infrastructure audit","prompt":"I'm setting up a new domain and want to confirm that smtp.mynewdomain.com already has its AAAA record in DNS — can you check via Cloudflare's DoH?"},{"title":"Diagnose IPv6 email delivery issue","prompt":"We're having trouble delivering email over IPv6 to smtp.acmecorp.com — can you check if its AAAA record exists and what addresses it resolves to?"}],"resultDescription":"Returns whether the smtp.<domain> AAAA record exists, the IPv6 address(es) in the record, the TTL, and the DNS response code (e.g. NOERROR or NXDOMAIN), as resolved via Cloudflare DNS-over-HTTPS.","failureModes":["Domain does not have an smtp subdomain — returns NXDOMAIN with no records","Invalid or malformed domain name causes a failed lookup","Cloudflare DoH upstream unavailability leads to timeout or error response","Domain exists but smtp host has no AAAA record (only A record) — returns empty record set"],"whenToPreferThis":"Use this endpoint when you specifically need to check whether the smtp subdomain of a given domain has an IPv6 (AAAA) DNS record, without performing broad subdomain enumeration. Ideal for quick existence checks on mail server IPv6 configuration. Prefer over general DNS tools when you want a targeted, per-domain, pay-per-lookup approach via Cloudflare DoH.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T18:55:51.844Z","isFirstParty":false,"canonicalSlug":"dns-aaaa-record-lookup-for-smtp-subdomain-55916966"}