{"uid":"cap_7-ouJRKqzGDwn_tYgDSWw","slug":"reverse-dns-change-watch-via-nextdns-5fd134d2","name":"Reverse DNS Change Watch via NextDNS","description":"Change watch for reverse dns via nextdns: runs the check, compares it with the result from your previous call for the same ip (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.","url":"https://ip.intel.rallylive.ca/watch/ip/ptr/via/nextdns?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2TdQ-lMBx7sDbrqV4uag3","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Monitors the reverse DNS (PTR) record of an IP address via NextDNS, detecting and reporting any changes since the last check.","exampleAgentPrompt":"Keep an eye on the reverse DNS record for 104.21.45.67 using NextDNS — let me know if the PTR record has changed since the last time you checked.","exampleUseCases":[{"title":"Server infrastructure PTR record monitoring","prompt":"Watch the reverse DNS for my server at 198.51.100.22 via NextDNS and tell me if its PTR record has changed since the last check — I want to know immediately if someone has altered the hostname."},{"title":"Suspicious IP hostname drift detection","prompt":"I'm tracking this suspicious IP 185.220.101.45 — check its reverse DNS through NextDNS and tell me whether the PTR record is different from what you saw last time, and what changed."},{"title":"Scheduled ISP reassignment alerting","prompt":"Set up a regular watch on reverse DNS for 203.0.113.10 using NextDNS so I get alerted whenever the PTR record flips, which would tell me the IP has been reassigned to a different customer or ISP block."}],"resultDescription":"Returns the current PTR (reverse DNS) record for the IP, a boolean 'changed' flag indicating whether it differs from the previous check, a list of fields that changed with before/after values, and the timestamp of when the record was last seen. Previous results are retained for 90 days for comparison.","failureModes":["IP address not provided or malformed — returns error","NextDNS resolution failure or timeout — may return error or empty PTR","No previous check exists for this IP yet — 'changed' will be false or indeterminate on first call","IP has no PTR record — returns empty or NXDOMAIN response","Payment not processed (x402) — request blocked before execution"],"whenToPreferThis":"Use this endpoint when you need to detect changes in reverse DNS (PTR records) for specific IP addresses over time, especially via NextDNS as the resolver. Prefer this over a plain PTR lookup when you want change detection with before/after diffs rather than just the current value. Ideal for scheduled monitoring pipelines, security alerting, or ISP reassignment tracking where knowing WHAT changed matters as much as the current state.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:43:17.053Z","isFirstParty":false,"canonicalSlug":"reverse-dns-change-watch-via-nextdns-5fd134d2"}