ASN Lookup

openapi: 3.1.0
info:
  title: ASN Lookup
  description: 'Given an internet address (IP) or a network identification number (ASN), this tool returns who operates that
    piece of the internet: the network number, the owner''s name, the country it''s registered in, the regional registry that
    manages it, and the exact address range it belongs to.'
  version: 1.0.0
  contact:
    name: _done
    url: https://forms.gle/5KzuSFH7p8hHtDmz7
    email: info@underscoredone.com
  x-openapi-url: https://asn-lookup.underscoredone.com/openapi.json
  x-logo:
    url: https://underscoredone.com/logo.png
    altText: _done
  x-guidance: Send a query that is either a plain IP address (like 8.8.8.8) or an ASN reference (like AS15169 or 15169). The
    tool figures out which one it is automatically. It looks up live data from the RIPEstat public information service (no
    key required) and returns the owning network's details. If the query is invalid or nothing is found, it returns a clear
    error message instead of guessing.
  x-ai-instructions: Send a query that is either a plain IP address (like 8.8.8.8) or an ASN reference (like AS15169 or 15169).
    The tool figures out which one it is automatically. It looks up live data from the RIPEstat public information service
    (no key required) and returns the owning network's details. If the query is invalid or nothing is found, it returns a
    clear error message instead of guessing.
  x-provider: _done — single-purpose utility APIs for developers and AI agents. Pay per call with USDC on Base Mainnet or
    Solana Mainnet.
  x-pricing:
    model: pay-per-call
    currency: USDC
    network: Base Mainnet or Solana Mainnet
    price: $0.01
  x-keywords:
  - network
  - asn
  - lookup
  - ip address
  - autonomous system
  - threat intel
  - abuse reporting
  - infrastructure mapping
  - whois
  - cidr
  - utility
  - api
  - ai-agent
  - pay-per-call
  - usdc
  - x402
  x-category: asn lookup
  x-provider-url: https://underscoredone.com
  x-agentcash-auth:
    mode: paid
  x-402:
    price: $0.01
    network: eip155:8453
    asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
    pay_to: '0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08'
    facilitator: https://api.cdp.coinbase.com/platform/v2/x402
    scheme: exact
    description: 'Given an internet address (IP) or a network identification number (ASN), this tool returns who operates
      that piece of the internet: the network number, the owner''s name, the country it''s registered in, the regional registry
      that manages it, and the exact address range it belongs to.'
    mime_type: application/json
    networks:
    - network: eip155:8453
      asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
      pay_to: '0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08'
    - network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
      asset: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v
      pay_to: 8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b
paths:
  /lookup:
    post:
      tags:
      - asn lookup
      - ip lookup
      - asn
      - ip intelligence
      - who owns this ip
      - autonomous system number
      - ip to asn
      - network owner
      - ip whois
      - bgp lookup
      - ip address owner
      - asn to ip range
      - regional internet registry
      - isp lookup
      - ip country
      summary: Finds the network owner and details behind an IP address or ASN
      description: Find out who owns and runs the piece of the internet behind an address or network number.
      operationId: handler_lookup_post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Request'
        required: true
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Response'
              examples:
                success:
                  summary: Successful response
                  value:
                    api_version: 1.0.0
                    query: 8.8.8.8
                    asn: AS15169
                    holder: GOOGLE
                    country: US
                    registry: arin
                    prefix: 8.8.8.0/24
                    allocated: '1992-12-01'
        '422':
          description: Unprocessable — a required field is missing or the wrong type. Check the detail field for specifics.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: array
        '402':
          description: Payment required. Send a signed USDC payment on Base Mainnet or Solana Mainnet using the x402 protocol.
          headers:
            X-Payment-Response:
              description: x402 payment challenge — base64-encoded JSON with payment details.
              schema:
                type: string
        '400':
          description: Bad request — your input failed validation or could not be processed. Check the detail field for specifics.
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
      x-ai-instructions: Send a query that is either a plain IP address (like 8.8.8.8) or an ASN reference (like AS15169 or
        15169). The tool figures out which one it is automatically. It looks up live data from the RIPEstat public information
        service (no key required) and returns the owning network's details. If the query is invalid or nothing is found, it
        returns a clear error message instead of guessing.
      x-guidance: Send a query that is either a plain IP address (like 8.8.8.8) or an ASN reference (like AS15169 or 15169).
        The tool figures out which one it is automatically. It looks up live data from the RIPEstat public information service
        (no key required) and returns the owning network's details. If the query is invalid or nothing is found, it returns
        a clear error message instead of guessing.
      x-payment-info:
        price:
          fixed:
            mode: fixed
            currency: USD
            amount: '0.01'
        protocols:
        - x402: {}
components:
  schemas:
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    Request:
      properties:
        query:
          type: string
          title: Query
          description: An internet address such as 8.8.8.8 or 2001:4860:4860::8888, or a network reference such as AS15169
            or 15169, that you want information about.
      type: object
      required:
      - query
      title: Request
      example:
        query: 8.8.8.8
    Response:
      properties:
        api_version:
          type: string
          title: Api Version
          description: The version number of this tool
          default: 1.0.0
        query:
          type: string
          title: Query
          description: The exact address or network number you searched for
        asn:
          type: string
          title: Asn
          description: The network number that owns this address, shown like AS15169
        holder:
          type: string
          title: Holder
          description: The name of the organisation that operates this network
        country:
          anyOf:
          - type: string
          - type: 'null'
          title: Country
          description: The two-letter country code where this network is registered, if known
        registry:
          anyOf:
          - type: string
          - type: 'null'
          title: Registry
          description: The regional internet registry that manages this network, if known
        prefix:
          anyOf:
          - type: string
          - type: 'null'
          title: Prefix
          description: The block of addresses this network owns, if known
        allocated:
          anyOf:
          - type: string
          - type: 'null'
          title: Allocated
          description: The date this network block was first given out, if known
      type: object
      required:
      - query
      - asn
      - holder
      title: Response
      example:
        allocated: '1992-12-01'
        api_version: 1.0.0
        asn: AS15169
        country: US
        holder: GOOGLE
        prefix: 8.8.8.0/24
        query: 8.8.8.8
        registry: arin
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError
  securitySchemes:
    siwx:
      type: apiKey
      in: header
      name: SIGN-IN-WITH-X
      description: CAIP-122 wallet signature for repeat access after payment
servers:
- url: https://asn-lookup.underscoredone.com
  description: Production
tags:
- name: asn lookup
- name: ip lookup
- name: asn
- name: ip intelligence
- name: who owns this ip
- name: autonomous system number
- name: ip to asn
- name: network owner
- name: ip whois
- name: bgp lookup
- name: ip address owner
- name: asn to ip range
- name: regional internet registry
- name: isp lookup
- name: ip country
x402Version: 2
x-payment-accepts:
- scheme: exact
  network: eip155:8453
  payTo: '0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08'
  asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
- scheme: exact
  network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
  payTo: 8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b
  asset: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v