{"uid":"cap_NOfOGdirk5nGm6TLRkudU","slug":"is-port-23-open-27f3c7d1","name":"is-port-23-open","description":"Is TCP port 23 (Telnet) 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 Telnet without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/23?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_wM8Yvtq3KrM61oUl_FNGe","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 23 (Telnet) 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 23 (Telnet) is open on host 192.168.1.100? I want to know if it's exposed without running a full scanner.","exampleUseCases":[{"title":"Telnet exposure audit on server","prompt":"Can you check whether port 23 is open or closed on my server at server.example.com? I need to know if Telnet is accidentally exposed to the internet."},{"title":"IoT device Telnet check","prompt":"I've got an IoT device at IP 203.0.113.45 — can you tell me if TCP port 23 is open on it? I want to make sure Telnet isn't accessible."},{"title":"Security compliance spot-check","prompt":"Before our security audit, can you verify if Telnet (port 23) is open or filtered on api.mycompany.com? I need the connection time too if it's reachable."}],"resultDescription":"Returns the port status as open, closed, or filtered, along with the connection attempt time in milliseconds. If the host is fronted by Cloudflare's edge network, the result is marked as inconclusive since Cloudflare answers on behalf of the origin.","failureModes":["Invalid or unresolvable hostname returns an error","Cloudflare-fronted hosts return inconclusive result rather than true port status","Network timeouts may cause filtered vs closed ambiguity","Private/RFC1918 IP addresses may not be reachable from Cloudflare's edge","Rate limits or payment failures return 402 or error response"],"whenToPreferThis":"Choose this endpoint when you need a quick, external Telnet (port 23) exposure check on a host without deploying your own network scanner. It's ideal for security audits, compliance checks, and asset monitoring where you need an outside-in perspective on port 23 specifically. Note the Cloudflare-fronted host limitation — if you know the target is behind Cloudflare, results will be inconclusive.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:43:25.939Z","isFirstParty":false,"canonicalSlug":"is-port-23-open-27f3c7d1"}