{"uid":"cap_1f1xJieLSbCxmuRyQXfF-","slug":"ip-listed-on-cbl-composite-blocking-list-88264afe","name":"IP Listed on CBL (Composite Blocking List)","description":"Is this IPv4 address listed on cbl (cbl.abuseat.org)? Performs the DNSBL query (reversed octets under cbl.abuseat.org, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.","url":"https://ip.intel.rallylive.ca/ip/blacklist/cbl?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_rrQ-BgNdcgKbJaZTnBIj1","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 a given IPv4 address is listed on the Composite Blocking List (cbl.abuseat.org) via DNSBL lookup, returning listed status, return codes, and reason text.","exampleAgentPrompt":"Can you check if the IP address 203.0.113.42 is listed on the CBL (cbl.abuseat.org) blacklist, and tell me the reason if it is?","exampleUseCases":[{"title":"Mail server deliverability check","prompt":"My email server at IP 198.51.100.10 is having deliverability issues — can you check if it's listed on the CBL blacklist and tell me why?"},{"title":"Suspicious traffic source investigation","prompt":"We're getting spam from IP 192.0.2.77 — is it flagged on the Composite Blocking List at cbl.abuseat.org?"},{"title":"Pre-send IP reputation audit","prompt":"Before we launch our email campaign, can you check if our sending IP 203.0.113.5 is on the CBL DNSBL and what the return code says?"}],"resultDescription":"Returns a yes/no indicator of whether the IPv4 address is listed on CBL (cbl.abuseat.org), along with DNSBL return codes and, where available, the reason text explaining why the IP was listed.","failureModes":["Invalid or non-routable IPv4 address provided returns an error","DNS resolution failure via Cloudflare DoH may cause a timeout or error response","IPv6 addresses are not supported (CBL/DNSBL lookup is IPv4-only)","Temporary unavailability of cbl.abuseat.org may result in a failed lookup"],"whenToPreferThis":"Choose this endpoint when you need a precise, single-list check against the Composite Blocking List (CBL) specifically, rather than a broad multi-list check. It is ideal for diagnosing CBL-specific blocks on mail servers, investigating spam sources that CBL tracks (botnet and proxy abuse), or when you need the CBL's reason text to understand the listing cause.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:46.950Z","isFirstParty":false,"canonicalSlug":"ip-listed-on-cbl-composite-blocking-list-88264afe"}