{"uid":"cap_U5Zj6MGEY-_HEeSS4wiwF","slug":"is-port-19-open-df7d2d09","name":"is-port-19-open","description":"Is TCP port 19 (Chargen) 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 Chargen without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/19?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_UCVf6NX67L7PFc4m6ROKx","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 19 (Chargen) 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 19 (Chargen) is open or closed on 203.0.113.45? I want to know if the Chargen service is exposed without running a full scanner.","exampleUseCases":[{"title":"Security audit for Chargen exposure","prompt":"I'm doing a security review — can you check if port 19 (Chargen) is open on server 198.51.100.22? I need to know if it's exposed to the internet so I can assess our DDoS amplification risk."},{"title":"Pre-deployment infrastructure check","prompt":"Before we go live, can you verify that port 19 is closed or filtered on our host at 192.0.2.100? We need to confirm Chargen isn't accidentally exposed."},{"title":"Third-party vendor risk assessment","prompt":"I'm assessing a vendor's network posture — can you probe whether TCP port 19 is open on their host vendor-infra.example.com and tell me the connection time if it is?"}],"resultDescription":"Returns whether TCP port 19 is open, closed, or filtered on the specified host, along with the connection time in milliseconds. Hosts behind Cloudflare's edge are flagged as inconclusive since Cloudflare intercepts connections on their behalf.","failureModes":["Cloudflare-fronted hosts return inconclusive result because Cloudflare's edge answers the connection probe","Hosts with aggressive firewalls may appear filtered even if the service is running internally","Temporary network transients at Cloudflare's edge may cause false closed/filtered results","Invalid or unresolvable hostnames will return an error or no result"],"whenToPreferThis":"Choose this endpoint when you need a quick, passive check on whether Chargen (TCP port 19) is exposed on a remote host without deploying your own scanner. Ideal for security audits, compliance checks, and DDoS amplification surface assessments. Prefer this over general port scanners when you specifically need port 19 status at low cost per check and want results proxied through Cloudflare's edge.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:45:40.987Z","isFirstParty":false,"canonicalSlug":"is-port-19-open-df7d2d09"}