{"uid":"cap_A3g0nUKD46gL2z4IpokB4","slug":"dns-a-record-lookup-for-www-subdomain-via-cloudflare-doh-3da73fc4","name":"DNS A Record Lookup for www Subdomain via Cloudflare DoH","description":"A record of www.<domain>: looks up the www 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 www without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/www/a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_-OosafpUjLUKwej9MRNkF","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 (IPv4) DNS record for the www subdomain of a given domain using Cloudflare DNS-over-HTTPS, returning existence status, IP records, and TTL.","exampleAgentPrompt":"Can you check if www.example.com has a valid DNS A record — I need to know the IP it resolves to and its TTL?","exampleUseCases":[{"title":"Verify website www subdomain is live","prompt":"Before we launch the campaign, can you check if www.acmecorp.com has an A record configured and what IP it resolves to?"},{"title":"Monitor competitor web presence","prompt":"I want to know if www.rivalstartup.io is resolving — does it have an A record and what's the TTL?"},{"title":"Validate domain setup after migration","prompt":"We just migrated our DNS — can you confirm that www.mybrand.net is pointing to an IP address and tell me the TTL so I know it's propagated?"}],"resultDescription":"Returns whether the www subdomain has an A record, the IPv4 address(es) it resolves to, the TTL of the record, and the DNS response code indicating existence or non-existence of the host.","failureModes":["Domain does not exist — NXDOMAIN response with no records","www subdomain not configured — no A record found but domain itself may exist","Invalid domain format in query — request rejected","Cloudflare DoH upstream timeout or failure — lookup may return an error","Network unreachability — endpoint itself may be temporarily unavailable"],"whenToPreferThis":"Use this endpoint when you specifically need to check whether the www host of a domain is configured with an IPv4 A record, without enumerating all subdomains. Prefer this over general DNS lookup services when you want a targeted, quick existence check for the canonical www subdomain, especially when building domain validation pipelines or monitoring web presence.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T18:47:55.472Z","isFirstParty":false,"canonicalSlug":"dns-a-record-lookup-for-www-subdomain-via-cloudflare-doh-3da73fc4"}