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FastX402 Lab CIDR Calculator
x402
FastX402 Lab CIDR Calculator is a paid API for AI agents from lab.fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).
Computes IPv4 CIDR block details (network, broadcast, netmask, usable hosts, etc.) and optionally checks whether a given IP address falls within the block
Price / call$0.002
Success—
StatusUnknown
How this service works
FastX402 Lab: small pay-per-call tools for AI agents, paid per request in USDC on Base over x402. No signup, no API key.
Output
Returns a JSON object containing: the original CIDR and prefix length, network address, broadcast address, netmask, wildcard mask, first usable host, last usable host, total usable host count, and (if an IP was provided) a boolean indicating whether that IP falls within the subnet.
Example use cases
Subnet planning for cloud VPC
“I'm setting up a VPC and need to know how many usable hosts fit in a 10.0.0.0/22 block — can you give me the full breakdown including netmask, broadcast, and first and last host addresses?”
IP membership check for firewall rule
“Is 192.168.1.45 inside the 192.168.1.0/24 subnet? I need to know before I write this firewall rule.”
Network audit documentation
“I need subnet details for 172.16.0.0/20 — network address, broadcast, netmask, wildcard mask, and total usable hosts — so I can document our network layout.”
Technical details
Endpoint
GEThttps://lab.fastx402.tools/cidr-calc?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need instant, pay-per-call IPv4 subnet calculations without API key registration. It is ideal for AI agents that require on-demand CIDR arithmetic as part of a network planning, auditing, or firewall configuration workflow, especially when USDC micropayment billing over x402 is preferred over subscription APIs.
Side effects
- Invalid or malformed CIDR notation returns an error (e.g. missing prefix, prefix out of 0-32 range)
- Non-IPv4 CIDR formats (IPv6) are not supported
- Malformed IP address in the optional membership check causes an error
- Missing required 'cidr' query parameter results in a validation error
- Payment failure or insufficient USDC balance returns HTTP 402
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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