{"uid":"cap_gn2hDzsq14Iteyr7noV4v","slug":"is-port-512-open-df23796e","name":"is-port-512-open","description":"Is TCP port 512 (rexec) 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 rexec without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/512?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_1NxYTBw4BCgc4hjCXm_al","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 512 (rexec) 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 512 (rexec) is open or closed on 203.0.113.45? I want to know if it's exposed without running a local scanner.","exampleUseCases":[{"title":"Security audit for rexec exposure","prompt":"I need to know if port 512 is open on my production server at api.mycompany.com — can you check whether rexec is accessible from the internet?"},{"title":"Pre-deployment firewall verification","prompt":"We're about to go live with our new VPS at 198.51.100.12 — can you confirm port 512 is closed or filtered so rexec isn't accidentally exposed?"},{"title":"Third-party vendor risk check","prompt":"I'm evaluating a vendor whose API server is at vendor.example.net — can you check if TCP port 512 is open on it? I want to know if they have rexec exposed before we connect."}],"resultDescription":"Returns whether TCP port 512 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is reported as inconclusive since Cloudflare's edge answers on behalf of the origin.","failureModes":["Host is Cloudflare-fronted: result returned as inconclusive rather than open/closed/filtered","Invalid or unresolvable hostname: lookup fails with an error","Network timeout: connection attempt times out, may be reported as filtered","Host actively refuses connection: reported as closed","Firewall silently drops packets: may be reported as filtered after timeout delay"],"whenToPreferThis":"Choose this endpoint when you need a quick, lightweight external check for rexec (port 512) exposure on a specific host without deploying your own scanner. It is ideal for security audits, firewall validation, and vendor risk assessments where you want an outside-in perspective on port reachability. Note the Cloudflare-fronted caveat: results for CDN-protected hosts will be inconclusive.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:40:52.414Z","isFirstParty":false,"canonicalSlug":"is-port-512-open-df23796e"}