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CIDR Contains Check
x402
CIDR Contains Check is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Checks whether a given IPv4 address falls within a specified CIDR block, returning a boolean result
Price / call$0.001
Success—
StatusUnknown
How this service works
Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.
Output
Returns a JSON object with a single boolean field 'contains' — true if the provided IPv4 address falls within the specified CIDR block, false otherwise. For example: {"contains": true}
Example use cases
Firewall allowlist IP validation
“I need to know if the IP 203.0.113.77 is inside the trusted corporate network range 203.0.113.0/24 — can you check that for me?”
Cloud egress range membership check
“Is the IP 35.192.0.5 part of the Google Cloud subnet 35.192.0.0/14? I need to confirm it's a GCP egress address before allowing it through.”
VPN subnet access control
“Can you verify whether 172.16.8.200 falls within the VPN subnet 172.16.0.0/12 so I can decide if this client should get access?”
Technical details
Endpoint
POSThttps://x402-agent.kariguetoazul.workers.dev/api/network/cidr-contains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap ($0.001 USDC), serverless computation to determine IPv4 subnet membership without running local networking libraries. Ideal for agents performing access control checks, firewall rule evaluation, or IP whitelisting logic in cloud-native or edge workflows where spinning up a local library is impractical. Best for single IP-to-CIDR checks; for bulk checks, consider batching multiple calls.
Side effects
- Invalid IPv4 address format returns an error
- Malformed CIDR notation (e.g. missing prefix length) causes a parse error
- IPv6 addresses are not supported (input capped at 15 chars for IPv4)
- CIDR prefix length out of range (e.g. /33) may return an error
- Missing required fields (ip or cidr) results in a validation error
- Payment failure via x402 protocol blocks request execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ip | string | IPv4 address. |
| cidr | string | IPv4 CIDR. |
Output
Schema · Response
{
"type": "json",
"example": {
"contains": true
}
}Tags
x402
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