{"uid":"cap_vHHuL2ljFYadFBZU17-F-","slug":"is-port-513-open-eabce1fd","name":"is-port-513-open","description":"Is TCP port 513 (rlogin) 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 rlogin without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/513?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_fprEat1fWypnTo0uu7Kym","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 513 (rlogin) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.","exampleAgentPrompt":"Can you check if TCP port 513 (rlogin) is open on the host 203.0.113.45 — I need to know if it's exposed, closed, or being filtered?","exampleUseCases":[{"title":"Rlogin exposure audit on server","prompt":"I need to know if rlogin port 513 is open or exposed on my server at 198.51.100.12 — can you check whether it's reachable from the outside?"},{"title":"Security sweep for legacy protocols","prompt":"We're doing a security review and want to check if port 513 is open on the host legacy-app.example.com — can you probe it and tell me if rlogin is accessible?"},{"title":"Verify firewall blocks rlogin","prompt":"I just updated our firewall rules to block rlogin. Can you test whether port 513 is still open on 10.0.0.5 to confirm it's now properly closed or filtered?"}],"resultDescription":"Returns the port status (open, closed, or filtered) for TCP port 513 on the target host, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is marked inconclusive because Cloudflare's edge answers on behalf of the origin.","failureModes":["Cloudflare-fronted hosts return inconclusive result because the edge terminates connections","Invalid or unresolvable hostname returns an error","Firewall or network timeout may cause the port to be reported as filtered rather than closed","Rate limiting or network errors at Cloudflare's edge may cause transient failures"],"whenToPreferThis":"Use this endpoint when you need a quick, lightweight check on whether rlogin (TCP port 513) is exposed on a specific host without deploying a full port scanner. Ideal for security audits, compliance checks, or verifying firewall rules for legacy protocols. Note that Cloudflare-fronted hosts will yield inconclusive results.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:23.946Z","isFirstParty":false,"canonicalSlug":"is-port-513-open-eabce1fd"}