{"uid":"cap_50jyTkGcRz_QMX55txb6D","slug":"dns-a-record-lookup-for-vpn-subdomain-via-cloudflare-doh-97a0bd14","name":"DNS A Record Lookup for VPN Subdomain via Cloudflare DoH","description":"A record of vpn.<domain>: looks up the vpn host under the domain you give (A via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like vpn without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/vpn/a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_wkqh042QSQbpL1tv3plTt","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 A record of vpn.<domain> using Cloudflare DNS over HTTPS and reports whether the host exists, its IP records, and TTL.","exampleAgentPrompt":"Can you check if vpn.example.com exists in DNS — specifically the A record — and tell me what IP it resolves to and the TTL?","exampleUseCases":[{"title":"VPN infrastructure discovery for a domain","prompt":"Does example.com have a VPN subdomain set up? Check the DNS A record for vpn.example.com and tell me if it exists and what IP it points to."},{"title":"Security audit of corporate DNS","prompt":"I'm auditing acmecorp.com — can you check whether they have a vpn host configured in DNS and what IP address it resolves to?"},{"title":"Competitor infrastructure research","prompt":"I want to know if our competitor rivalcompany.com is running a VPN endpoint — look up the A record for their vpn subdomain and tell me what you find."}],"resultDescription":"Returns whether the vpn.<domain> A record exists, the resolved IP address(es), the TTL value, and the DNS response code (e.g. NOERROR or NXDOMAIN) as answered by Cloudflare DNS over HTTPS.","failureModes":["Domain does not have a vpn subdomain (NXDOMAIN response returned)","Invalid or malformed domain name input causes query failure","Cloudflare DoH service temporarily unavailable","Domain exists but has no A record (e.g. only CNAME or AAAA records)","Rate limiting or payment failure for the $0.01 per-call fee"],"whenToPreferThis":"Use this endpoint when you need a quick, targeted existence check for the vpn subdomain of a specific domain without enumerating all subdomains. Prefer this over general DNS lookup tools when you specifically want the A record for the vpn host resolved via Cloudflare DoH, and when a cheap per-call cost model ($0.01) is acceptable.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T18:54:45.240Z","isFirstParty":false,"canonicalSlug":"dns-a-record-lookup-for-vpn-subdomain-via-cloudflare-doh-97a0bd14"}