CIDR calculator

$0.003 per call · failed calls are never charged · no account or API key needed

Details of an IPv4 network in CIDR notation: network and broadcast address, first and last usable host, netmask, number of addresses, and whether a given IP falls inside. Use for firewall rules and allowlists.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
cidr (required)stringIPv4 network in CIDR notation
ipstringOptional IPv4 address to test for membership

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/ip/cidr?cidr=192.168.1.0%2F24"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/ip/cidr?cidr=192.168.1.0%2F24&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, Monad, World Chain or Tempo) and retries.

Example result

{
  "network": "192.168.1.0",
  "broadcast": "192.168.1.255",
  "first": "192.168.1.1",
  "last": "192.168.1.254",
  "prefix": 24,
  "netmask": "255.255.255.0",
  "addresses": 256,
  "usableHosts": 254,
  "contains": true
}

From an AI agent (MCP)

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

https://agent-data-tools.revmesh2074.workers.dev/mcp

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