{"uid":"cap_nqf3HkKW6ObLvLaD2DpOG","slug":"reverse-dns-via-alidns-watch-9b8c991d","name":"reverse-dns-via-alidns-watch","description":"Change watch for reverse dns via alidns: 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. $0.02 per check.","url":"https://ip.intel.rallylive.ca/watch/ip/ptr/via/alidns?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_NlCF4ZArYX-hekeTMzEW5","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":"Performs a reverse DNS (PTR) lookup for an IP using AliDNS, then compares the result against the previously stored result to detect changes.","exampleAgentPrompt":"Check the reverse DNS of 203.0.113.42 using AliDNS and tell me if the PTR record has changed since the last time we checked — show me what changed, the before and after values, and when it was last seen.","exampleUseCases":[{"title":"Server IP hostname drift detection","prompt":"Keep an eye on the PTR record for 198.51.100.7 via AliDNS — I want to know immediately if the reverse DNS changes and what the old vs new hostname was."},{"title":"Threat intel IP reputation monitoring","prompt":"For IP 45.33.32.156, check its reverse DNS through AliDNS right now and compare it to what it was before — flag it if anything changed so I can update my threat feed."},{"title":"CDN or cloud provider attribution tracking","prompt":"Run a reverse DNS watch on 104.21.0.1 using AliDNS and tell me if the PTR record has flipped — I'm tracking whether this IP moved to a different cloud provider."}],"resultDescription":"Returns the current PTR record answer from AliDNS, a boolean 'changed' flag, a list of fields that changed with their before and after values, and a timestamp of when the record was last seen. Results are stored for 90 days for comparison.","failureModes":["IP not previously checked — no baseline exists so 'changed' will be false on first call","IP has no PTR record — response returns empty or null PTR answer","AliDNS resolver unavailable — lookup may time out or return an error","Malformed IP address input — invalid format may cause a 4xx error","90-day retention window exceeded — previous result purged, treated as first-time check"],"whenToPreferThis":"Choose this endpoint when you specifically want to detect changes in reverse DNS (PTR) records using AliDNS as the resolver, and need a historical comparison with before/after diffs rather than just a raw PTR lookup. Prefer this over a plain reverse DNS lookup when your goal is change alerting, drift detection, or audit logging of PTR record mutations over time.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:42:38.500Z","isFirstParty":false,"canonicalSlug":"reverse-dns-via-alidns-watch-9b8c991d"}