Look up an Autonomous System (BGP) by AS number. Pass asn as AS3333 or 3333. Returns the AS holder/operator name, the IANA/RIR allocation block it falls in, whether it is currently announced, and a live routing-status block: first/last seen prefixes, announced IPv4/IPv6 prefix + address counts, RIS peer visibility, and observed BGP neighbour count. Data: RIPEstat (RIPE NCC), free and public. Distinct from geo.ip (host geolocation) and dns/whois (name lookups) — this is who-owns-and-routes-this-AS, observed live from the global routing table. For network forensics, abuse/security triage, and infrastructure mapping.
/api/net/asnPAYMENT-SIGNATURE.The asn API is a pay-per-call net endpoint built for AI agents and autonomous software. Look up an Autonomous System (BGP) by AS number.
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in asn data source for an agent tool-use loop, an MCP host, or a backend that needs net data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
asnrequired | string | AS number, e.g. AS3333 or 3333. min 1 chars · max 15 chars |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/net/asn?asn=example' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/net/asn?asn=example' \ -H 'PAYMENT-SIGNATURE: <base64-json-payload>' # Or use the canonical runner (handles probe → sign → retry): # EVM_PRIVATE_KEY=0x... node --env-file=.env.local \ # --experimental-strip-types scripts/x402-pay.ts \ # 'https://2s.io/api/net/asn?asn=example'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.net.asn({
"asn": "example"
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.net.asn(asn="example")
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "net.asn",
"arguments": {
"asn": "example"
}
}
}| Field | Type | Description |
|---|---|---|
asn | number | |
resource | string | |
holder | string | |
announced | boolean | |
block | object | |
routing | object | |
sources | array |
{
"asn": 1,
"resource": "example",
"holder": "example",
"announced": false,
"block": {
"resource": "example",
"name": "example",
"description": "example"
},
"routing": {
"found": false,
"error": "example",
"firstSeen": {
"prefix": "example",
"time": "example"
},
"lastSeen": {
"prefix": "example",
"time": "example"
},
"announcedV4": {
"prefixes": 1,
"ips": 1
},
"announcedV6": {
"prefixes": 1,
"slash48s": 1
},
"visibilityV4": {
"seeing": 1,
"total": 1
},
"visibilityV6": {
"seeing": 1,
"total": 1
},
"observedNeighbours": 1
},
"sources": [
{
"provider": "example",
"url": "example",
"license": "example"
}
]
}