{"uid":"cap_U8IZYYgmVo-YjgYAUixrk","slug":"is-port-123-open-c9328268","name":"is-port-123-open","description":"Is TCP port 123 (NTP) 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 NTP without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/123?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_6B3-TST6VLyzgLyMtrbe6","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 123 (NTP) 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 123 (NTP) is open or closed on the host 203.0.113.42? I want to know if it's exposed to the internet without running a scanner.","exampleUseCases":[{"title":"NTP exposure audit for public server","prompt":"Check whether port 123 is open on ntp.example.com — I want to confirm whether our NTP service is actually reachable from the internet or being blocked by a firewall."},{"title":"Security scan for unexpected NTP listener","prompt":"Is TCP port 123 open on 198.51.100.15? I'm doing a quick security check to see if that host is accidentally exposing an NTP service."},{"title":"Infrastructure readiness check before go-live","prompt":"Before we launch, can you verify that port 123 is accessible on our time server at 192.0.2.88? We need NTP to be reachable from external clients."}],"resultDescription":"Returns whether TCP port 123 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is behind Cloudflare, the result is marked inconclusive since Cloudflare's edge intercepts the connection.","failureModes":["Host is Cloudflare-fronted: result marked inconclusive because Cloudflare's edge answers instead of the actual host","Host is unreachable or DNS does not resolve: may return filtered or error state","Firewall silently drops packets: reported as filtered rather than closed","Network timeout from Cloudflare edge: may return filtered","Invalid hostname or IP supplied: request error"],"whenToPreferThis":"Use this endpoint when you need a lightweight, remote NTP port reachability check from an external vantage point (Cloudflare's edge) without deploying your own network scanner. Ideal for security audits, infrastructure validation, and exposure checks where you want to confirm whether port 123 is internet-accessible. Note that Cloudflare-fronted hosts will return inconclusive results.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:43.543Z","isFirstParty":false,"canonicalSlug":"is-port-123-open-c9328268"}