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IP CIDR Containment Check
x402
IP CIDR Containment Check is a paid API for AI agents from ip.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Tests whether a given IP address (IPv4 or IPv6) falls within a specified CIDR block, returning a boolean contains result.
Price / call$0.002
Success—
StatusUnknown
How this service works
Test whether an IP address falls within a CIDR block. A well-formed address of a different family (or simply outside the block) returns contains=false — not an error.
Output
Returns a JSON object with a boolean 'contains' field indicating whether the provided IP address falls within the specified CIDR block. A well-formed IP of a different address family or an IP simply outside the range returns contains=false rather than an error.
Example use cases
Firewall allowlist IP validation
“I need to check whether 10.20.30.45 is inside our trusted internal subnet 10.20.0.0/16 before allowing it through the firewall — can you confirm if it's in that block?”
Cloud VPC subnet membership check
“Does the IP 172.31.15.200 fall within the AWS VPC subnet 172.31.0.0/20? I need to know if this instance is in the right network segment.”
IPv6 address range verification
“Can you tell me if the IPv6 address 2001:db8::ff is contained within the CIDR block 2001:db8::/32?”
Technical details
Endpoint
POSThttps://ip.openverbs.com/v1/containsWhen to prefer
Use this endpoint when you need a fast, reliable, single-call check to determine if an IP address falls within a CIDR block — especially in agentic workflows that need to validate network membership, enforce IP allowlists/blocklists, or route traffic decisions. Prefer this over rolling your own bitwise math or loading a full networking library when you need a lightweight, pay-per-use microservice with no setup. It handles both IPv4 and IPv6 gracefully without throwing errors on cross-family comparisons.
Side effects
- Malformed CIDR block (e.g. missing prefix length or invalid notation) returns an error
- Malformed IP address string returns an error
- Missing required fields (cidr or address) returns a validation error
- Payment not included or insufficient triggers a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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