{"uid":"cap_cxR_HFfiJ8S0Ci28Ok3Pd","slug":"reverse-dns-via-cleanbrowsing-1206359b","name":"reverse-dns-via-cleanbrowsing","description":"Reverse DNS (PTR) of an IPv4 address as answered by CleanBrowsing (security filter): the hostname(s), TTL and response code, plus whether the PTR's forward A record points back (forward-confirmed reverse DNS). Compare resolvers for stale or filtered answers. $0.01 per lookup.","url":"https://ip.intel.rallylive.ca/ip/ptr/via/cleanbrowsing?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_oSiRetbKQo4-e2NkAhilW","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":"Performs a reverse DNS (PTR) lookup for an IPv4 address using CleanBrowsing's security-filtered resolver, returning hostname(s), TTL, response code, and forward-confirmed reverse DNS (FCrDNS) status.","exampleAgentPrompt":"What hostname does CleanBrowsing return for the reverse DNS of 8.8.8.8, and does the PTR record forward-confirm back to that IP?","exampleUseCases":[{"title":"Email sender IP reputation check","prompt":"I need to verify the reverse DNS of the IP 203.0.113.45 using CleanBrowsing's resolver — does it have a PTR record, and does the forward A record point back to confirm it?"},{"title":"Detecting filtered PTR via security resolver","prompt":"Can you check whether CleanBrowsing is filtering or blocking the PTR record for 198.51.100.12? I want to know the response code and TTL it returns."},{"title":"Comparing resolver PTR discrepancies","prompt":"Look up the reverse DNS of 192.0.2.100 through CleanBrowsing and tell me the hostname, TTL, and whether forward-confirmed reverse DNS checks out — I'm comparing it against other resolvers to spot stale answers."}],"resultDescription":"Returns the PTR hostname(s) associated with the queried IPv4 address as resolved by CleanBrowsing, along with the DNS TTL, DNS response code (e.g. NOERROR, NXDOMAIN, SERVFAIL), and a boolean indicating whether the PTR record is forward-confirmed (i.e. the resolved hostname's A record points back to the original IP).","failureModes":["IP not in valid IPv4 format returns an error or empty response","CleanBrowsing may filter or block certain PTR records, returning NXDOMAIN or SERVFAIL even if a PTR exists on other resolvers","No PTR record configured for the IP results in NXDOMAIN response","FCrDNS check fails if the hostname's A record does not resolve back to the queried IP","Network timeout contacting CleanBrowsing resolvers may result in a SERVFAIL response"],"whenToPreferThis":"Choose this endpoint when you specifically want to see how CleanBrowsing's security-filtered DNS resolver answers PTR queries — useful for diagnosing whether a security filter is suppressing or altering reverse DNS results, verifying FCrDNS for email deliverability checks, or comparing resolver behavior across providers. Prefer this over generic PTR lookups when CleanBrowsing's perspective (security filtering) is the distinguishing factor.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:43:30.515Z","isFirstParty":false,"canonicalSlug":"reverse-dns-via-cleanbrowsing-1206359b"}