{"uid":"cap_Wzvd3iCn0eu0V4-2AW33i","slug":"ip-listed-on-uceprotect-level-3-dnsbl-3-uceprotect-net-5c8cef5e","name":"IP Listed on UCEPROTECT Level 3 (dnsbl-3.uceprotect.net)","description":"Is this IPv4 address listed on uceprotect 3 (dnsbl-3.uceprotect.net)? Performs the DNSBL query (reversed octets under dnsbl-3.uceprotect.net, 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. $0.01 per lookup.","url":"https://ip.intel.rallylive.ca/ip/blacklist/uceprotect-3?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_sBdceuWel7VzrNIi1S3kV","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 an IPv4 address is listed on the UCEPROTECT Level 3 DNSBL (dnsbl-3.uceprotect.net) and returns the listing status, return codes, and reason text.","exampleAgentPrompt":"Check if 198.51.100.45 is listed on the UCEPROTECT Level 3 blacklist and tell me whether it's flagged and why.","exampleUseCases":[{"title":"Pre-send email deliverability check","prompt":"Before I send out this email campaign, check if our sending IP 203.0.113.12 is listed on the UCEPROTECT-3 blacklist — I need to know if we're blocked and what the reason is."},{"title":"Investigating blocked inbound mail","prompt":"We're having trouble receiving mail from a partner — their server IP is 198.51.100.88. Can you check if it's listed on UCEPROTECT Level 3 and give me the return code and any reason text?"},{"title":"IP reputation audit for new server","prompt":"I just provisioned a new server at 192.0.2.77 and want to make sure it's clean — can you check if it's on the UCEPROTECT-3 DNSBL before I start sending mail from it?"}],"resultDescription":"Returns whether the queried IPv4 address is listed on UCEPROTECT Level 3 (dnsbl-3.uceprotect.net), along with the DNS return codes from the lookup and, where published by the list, a human-readable reason explaining why the IP or its network is listed.","failureModes":["Invalid or non-public IPv4 address provided — no meaningful DNSBL result","DNS resolution failure via Cloudflare DoH — lookup cannot be completed","IP is not listed — returns listed: false with no return codes or reason","UCEPROTECT-3 service unavailable or unreachable — timeout or error response","Malformed input (e.g. IPv6 address, domain name instead of IP) — request rejected"],"whenToPreferThis":"Use this endpoint when you specifically need to check the UCEPROTECT Level 3 list, which lists entire ASNs or netblocks rather than individual IPs — making it relevant for diagnosing ISP-level or network-level spam reputation issues. Prefer this over UCEPROTECT Level 1 or 2 endpoints when investigating why a whole network range is blocked. It provides a single authoritative answer for exactly one list, making it suitable for targeted DNSBL checks rather than broad reputation aggregation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:26.539Z","isFirstParty":false,"canonicalSlug":"ip-listed-on-uceprotect-level-3-dnsbl-3-uceprotect-net-5c8cef5e"}