IP address classifier API: private, public, loopback or link-local

$0.001 per call with a key ($0.01 paid per call from a wallet) · failed calls are never charged · no account needed: a card key or USDC

Classify an IPv4 or IPv6 address without any lookup: version, whether it is private, loopback, link-local, carrier-grade NAT or public, and its integer and reverse-DNS forms (IPv4). Use to triage IPs in logs or allowlists.

When to use it

Triage IPs in logs or allowlists
Tell private, loopback, link-local, carrier-grade NAT and public addresses apart
Get the integer and reverse-DNS forms of an IPv4 address

Run it free (3 free calls) Buy credits by card (from $1) Example result (JSON)

$0.001 per call with prepaid credits: $1 by card pays for 1,000 calls, with no account and no subscription.

Inputs

Name	Type	Description
`ip` (required)	string	The IP address

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://glyphcall.com/ip/info?ip=10.1.2.3"

Or one of your 3 free calls, no key:

curl "https://glyphcall.com/ip/info?ip=10.1.2.3&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "ip": "10.1.2.3",
  "version": 4,
  "private": true,
  "loopback": false,
  "linkLocal": false,
  "public": false,
  "integer": 167838211,
  "reverseDns": "3.2.1.10.in-addr.arpa"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ip_info, and the first 25 successful calls are free:

https://glyphcall.com/mcp

Questions

Does it look up geolocation or ownership?

No. It classifies the IPv4 or IPv6 address without any lookup.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 3 calls are free (25 through an MCP client). Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.