IP-in-CIDR Membership Check

Check whether an IPv4 or IPv6 address falls inside a CIDR network block (RFC 4632).

Free tier eligible — 500 calls/month with a free key from /pricing; x402 pay-per-call above quota.

Parameters

Parameter	Type	Required	Description
`ip`	string	required	IP address (IPv4 or IPv6)
`cidr`	string	required	CIDR network block, e.g. '10.0.0.0/8'

Call it over MCP (JSON-RPC 2.0)

curl -s https://wingmanprotocol.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "ip_in_cidr", "arguments": {"ip": "example", "cidr": "example-id"}}}'

Or plain HTTP

curl -s https://wingmanprotocol.com/tools/ip_in_cidr \
  -H 'Content-Type: application/json' \
  -d '{"ip": "example", "cidr": "example-id"}'

Try it live

Edit the JSON and run it — this POSTs to https://wingmanprotocol.com/tools/ip_in_cidr from your browser.

This tool is x402-metered — agents pay per call with USDC on Base. The 402 response below is the standard x402 payment-requirements envelope: sign the EIP-3009 authorization and retry with the X-Payment header, or get a free key at /pricing (500 calls/month, no card, no crypto).