{"slug":"agent402-tools-api-asn-info-2c879b","title":"Look up the Autonomous System (ASN), prefix, country, registry, and allocation d","host":"agent402.tools","method":"POST","resource":"https://agent402.tools/api/asn-info","category":"company","description":"Look up the Autonomous System (ASN), prefix, country, registry, and allocation date for an IPv4 address - or for a hostname (which is resolved first). Uses Team Cymru's free DNS-based IP→ASN mapping; no HTTPS upstream, no auth, no rate-limit headaches.","price_listed":0.001,"price_asked":0.001,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":936,"reported_calls_30d":5,"reported_payers_30d":2,"networks":["algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=","eip155:10","eip155:1329","eip155:137","eip155:143","eip155:42161","eip155:42220","eip155:43114","eip155:4663","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","stellar:pubnet"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"ip":"8.8.8.8"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"host":{"description":"Hostname to resolve first (also accepts hostname/domain/url/email)","type":"string"},"ip":{"description":"IPv4 address to look up (mutually exclusive with host)","type":"string"}},"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"allocationDate":{"type":"string"},"asn":{"type":"string"},"country":{"type":"string"},"ip":{"type":"string"},"owner":{"type":"string"},"prefix":{"type":"string"},"queriedAt":{"type":"string"},"registry":{"type":"string"}},"required":["ip","asn","owner","prefix","country","registry","allocationDate","queriedAt"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-24","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.001,"price_match":true,"latency_ms":936,"error":null}],"description_full":"Look up the Autonomous System (ASN), prefix, country, registry, and allocation date for an IPv4 address - or for a hostname (which is resolved first). Uses Team Cymru's free DNS-based IP→ASN mapping; no HTTPS upstream, no auth, no rate-limit headaches.","last_updated":"2026-09-17T05:20:52.284Z","schemes":["exact","upto"]}