{"uid":"cap_yDSxfBV8sCxF-UTLJaoGm","slug":"reverse-dns-ptr-lookup-d773592f","name":"Reverse DNS (PTR) Lookup","description":"Reverse DNS (PTR) lookup: the hostname for an IPv4 or IPv6 address, with the arpa name and TTL. Identify servers, mail hosts and hosting providers from an IP. $0.01 per lookup.","url":"https://intel.rallylive.ca/dns/reverse","method":"GET","headers":{},"bodySchema":{"type":"object","$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_rVJgVcnFvsYV0WfcUEnBW","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":"Resolves an IPv4 or IPv6 address to its hostname via a PTR record, returning the ARPA name and TTL.","exampleAgentPrompt":"Can you do a reverse DNS lookup on 8.8.8.8 and tell me what hostname and ARPA name it resolves to?","exampleUseCases":[{"title":"Identify mail server behind IP","prompt":"I'm seeing emails coming from 185.220.101.45 — can you do a reverse DNS lookup and tell me what hostname that IP resolves to so I can figure out if it's a legit mail host?"},{"title":"Investigate suspicious server IP","prompt":"We're seeing traffic from 203.0.113.72 in our logs — do a reverse DNS lookup on it and tell me the PTR record and TTL so I can identify what server or hosting provider it belongs to."},{"title":"Enrich IP data for abuse report","prompt":"I need the hostname and ARPA name for 2001:4860:4860::8888 — run a reverse DNS lookup so I can include the PTR record details in my network abuse report."}],"resultDescription":"Returns the resolved hostname (PTR record target), the ARPA domain name (e.g. 8.8.8.8.in-addr.arpa), and the TTL of the PTR record for the queried IP address.","failureModes":["No PTR record exists for the IP — returns empty or NXDOMAIN-equivalent result","Invalid IP address format — query rejected","IPv6 address not found in reverse DNS — returns null hostname","Network timeout or DNS resolver error — service may return an error response","Private/reserved IP ranges may have no public PTR records"],"whenToPreferThis":"Use this endpoint when you need to resolve an IP address to a human-readable hostname using DNS PTR records, especially for identifying mail servers, hosting providers, or server infrastructure. Prefer this over forward DNS lookups when you start from an IP and need the associated domain. At $0.01 per call it is cost-effective for on-demand enrichment of individual IPs in security, deliverability, or network analysis workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T13:13:20.834Z","isFirstParty":false}