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FastX402 CIDR Calculator
x402
FastX402 CIDR Calculator is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).
Calculates network details for an IPv4 CIDR block (netmask, broadcast, host range, usable hosts) and optionally tests whether a given IP address falls within that block.
Price / call$0.002
Success—
StatusUnknown
How this service works
146 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 CIDR prefix length, netmask, wildcard mask, network address, broadcast address, first and last usable host addresses, total usable host count, and optionally a boolean indicating whether the provided IP address is within the block.
Example use cases
Subnet planning for cloud VPC
“I'm setting up a VPC and need to know the full details of 172.16.0.0/20 — give me the network address, broadcast, first and last usable host, and how many hosts fit in it.”
IP membership check for firewall rules
“I need to verify whether 192.168.5.47 is inside the subnet 192.168.4.0/22 — can you check that for me?”
Subnetting audit for network documentation
“For our network documentation, can you break down 10.10.0.0/26 and tell me the netmask, wildcard, broadcast address, and how many usable hosts it has?”
Technical details
Endpoint
GEThttps://fastx402.tools/cidr-calc?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need fast, structured IPv4 subnet calculations without setting up an account or API key — particularly useful in networking automation, infrastructure planning, or firewall rule validation workflows where payment via USDC on Base per call is acceptable.
Side effects
- Missing required 'cidr' query parameter returns an error
- Invalid CIDR notation (e.g. malformed prefix or out-of-range prefix length 0-32) returns an error
- Invalid IPv4 format for optional 'ip' parameter returns an error
- Payment not included or invalid x402 payment header results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ip": "10.0.3.255",
"cidr": "10.0.0.0/22",
"prefix": 22,
"netmask": "255.255.252.0",
"network": "10.0.0.0",
"wildcard": "0.0.3.255",
"broadcast": "10.0.3.255",
"ip_inside": true,
"last_host": "10.0.3.254",
"first_host": "10.0.0.1",
"usable_hosts": 1022
}
}Tags
x402
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