{"uid":"cap_zCyHR5B35XWjhh8GmjxHk","slug":"saylor-innovations-asn-prefix-lookup-2e7e0b57","name":"Saylor Innovations ASN Prefix Lookup","description":"Autonomous system holder and announced IP prefixes by ASN from RIPEstat - IPv4 and IPv6 ranges currently routed in BGP and registry block information","url":"https://saylorinnovations.com/api/net/asn-prefixes?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","required":["asn"],"properties":{"asn":{"type":"string","description":"Autonomous system number, e.g. 3333 or AS3333"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["asn","announced"],"properties":{"asn":{"type":"number"},"holder":{"type":["string","null"]},"source":{"type":"string","description":"Data source the values come from"},"window":{"type":"object"},"announced":{"type":"boolean"},"truncated":{"type":"boolean","description":"True when the list was cut at the limit"},"ipv4_prefixes":{"type":"array","description":"Ipv4 prefixes"},"ipv6_prefixes":{"type":"array","description":"Ipv6 prefixes"},"prefix_counts":{"type":"object","description":"Prefix counts"},"registry_block":{"type":["string","null"],"description":"Registry block"}}}}}}},"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_1-PF_f11aqd9Yg4Mz_YUZ","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":"Returns announced IPv4 and IPv6 BGP prefixes, holder information, and registry block data for a given Autonomous System Number (ASN) via RIPEstat","exampleAgentPrompt":"What IPv4 and IPv6 prefixes is AS13335 currently announcing in BGP, and who holds that ASN?","exampleUseCases":[{"title":"Cloudflare network footprint audit","prompt":"Can you pull all the IP prefixes announced by AS13335 — I want to see every IPv4 and IPv6 range Cloudflare is routing in BGP right now, plus the holder name."},{"title":"Threat intel ASN investigation","prompt":"I need to know everything about AS9009 — is it active in BGP, who holds it, and what IPv4 and IPv6 blocks are being announced? I'm investigating some suspicious traffic."},{"title":"ISP infrastructure enumeration","prompt":"Look up the BGP prefixes for AS3320 — I want the full list of IPv4 and IPv6 ranges they're routing along with the registry block info for that autonomous system."}],"resultDescription":"A JSON object containing the ASN number, holder name (or null), whether the ASN is currently announced in BGP, arrays of IPv4 and IPv6 prefix strings currently routed, prefix counts broken down by IP version, the registry block string, the data source (RIPEstat), the BGP observation window, and a truncation flag indicating if the prefix list was cut short.","failureModes":["Invalid or malformed ASN input returns an error","ASN not found in RIPEstat database returns empty or null holder","ASN exists but has no active BGP announcements — announced=false with empty prefix arrays","Prefix list truncated when ASN announces an extremely large number of routes (truncated=true)","Upstream RIPEstat API unavailability causes request failure"],"whenToPreferThis":"Use this endpoint when you need authoritative BGP routing data — specifically the currently announced IP prefix ranges for a given ASN — sourced from RIPEstat/RIPE NCC. Prefer it over generic WHOIS tools when you need structured IPv4 and IPv6 prefix arrays with counts, not just holder text. It is ideal for network reconnaissance, threat intelligence enrichment, ISP footprint analysis, or validating whether an ASN is actively routing traffic in the global BGP table.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T19:25:05.561Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-asn-prefix-lookup-2e7e0b57"}