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FastX402 IP CIDR Membership Check
x402
FastX402 IP CIDR Membership Check is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).
Checks whether a given IP address (IPv4 or IPv6) falls within a specified CIDR network range
Price / call$0.001
Success—
StatusUnknown
How this service works
200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object with the queried IP address, the CIDR range, and a boolean 'match' field indicating whether the IP falls within the specified CIDR block (e.g. {"ip": "192.168.1.50", "cidr": "192.168.1.0/24", "match": true}).
Example use cases
Firewall rule IP allowlist check
“I need to verify whether the IP 203.0.113.45 is within my allowed network range 203.0.113.0/24 — can you check if it's a member?”
Private network detection
“Is the IP address 10.42.7.200 part of the private network range 10.0.0.0/8?”
IPv6 subnet membership
“Check if the IPv6 address 2001:db8::ff00 is inside the subnet 2001:db8::/32.”
Technical details
Endpoint
GEThttps://fastx402.tools/ip-cidr-membership?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, lightweight, no-account-required check for IP-to-CIDR membership — especially useful in agent workflows that need to validate whether a request IP is within an allowed or blocked range, perform geofencing logic, or enforce network access control policies. Prefer this over writing custom subnet math when you need a reliable, API-based single check at minimal cost ($0.001 USDC per call).
Side effects
- Invalid IP address format returns an error response
- Malformed CIDR notation (e.g. missing prefix length) returns an error
- IPv4 address checked against IPv6 CIDR or vice versa may return match: false or error
- Missing required query parameters (ip or cidr) results in a bad request error
- Payment failure via x402 protocol prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ip": "192.168.1.50",
"cidr": "192.168.1.0/24",
"match": true
}
}Tags
x402
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