{"uid":"cap_kuM-bB1Yr_h4YQyzSEhE_","slug":"is-port-873-open-d973471c","name":"is-port-873-open","description":"Is TCP port 873 (rsync) open on a host? Attempts a connection from Cloudflare's edge and reports open/closed/filtered with the connect time; Cloudflare-fronted hosts are reported as inconclusive because their edge answers for them. Exposure checks for rsync without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/873?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_2hTIX3E2UiJw39SZ4XCD6","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":"Checks whether TCP port 873 (rsync) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.","exampleAgentPrompt":"Can you check whether TCP port 873 (rsync) is open or closed on the host 203.0.113.42? I want to know if rsync is publicly exposed without running a scanner.","exampleUseCases":[{"title":"Rsync exposure audit before deployment","prompt":"Before I deploy this server, check if port 873 is open on 198.51.100.10 — I need to make sure rsync isn't accidentally exposed to the internet."},{"title":"Security sweep of a client's server","prompt":"Run a quick check on port 873 for my client's server at storage.example.com — I want to know if rsync is reachable and how long the connection takes."},{"title":"Incident response rsync exposure check","prompt":"We got a tip that one of our servers might have rsync exposed — can you check if TCP port 873 is open or filtered on 192.0.2.55?"}],"resultDescription":"Returns the status of TCP port 873 on the target host: open, closed, or filtered, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is marked as inconclusive because Cloudflare's edge answers on behalf of the origin.","failureModes":["Cloudflare-fronted hosts return inconclusive result because Cloudflare's edge intercepts the connection","Host is unreachable or DNS does not resolve, returning an error or filtered status","Network-level firewalls may cause filtered status even when the service is running","Rate limiting or payment failure may prevent the check from completing"],"whenToPreferThis":"Use this endpoint when you need a lightweight, no-scanner check on whether rsync (TCP port 873) is publicly reachable on a specific host, especially for security audits, compliance checks, or pre-deployment exposure verification. It is preferable to full port scanners when you only need to check this specific port quickly and cheaply at $0.01 per call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:41:45.299Z","isFirstParty":false,"canonicalSlug":"is-port-873-open-d973471c"}