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Subnet calculator

Compute network details of a CIDR block — network & broadcast address, usable host range, total and usable address counts. Works for IPv4 and IPv6 (counts returned as strings for large IPv6 blocks). Honours RFC 3021 for /31.

Visit ip.openverbs.com

Hostip.openverbs.com
Price$0.002 per call
NetworkBase
Paid endpoints listed4
Calls, last 30 days*8
Most unique payers on one endpoint (30 days)*2
Last paid call*2026-10-08
Tagssubnet calculator, cidr calculator, ip network range, calculate usable hosts, network broadcast address, ip address parser, parse ip address, classify ip address

* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.

Endpoints

URLMethodPrice
https://ip.openverbs.com/v1/subnet
Compute network details of a CIDR block — network & broadcast address, usable host range, total and usable address…		POST$0.002
https://ip.openverbs.com/v1/parse
Parse an IPv4 or IPv6 address and classify it — version, normalized form and RFC range (unicast, private, loopback,…		POST$0.002
https://ip.openverbs.com/v1/contains
Test whether an IP address falls within a CIDR block. A well-formed address of a different family (or simply outside…		POST$0.002
https://ip.openverbs.com/v1/expand
Return both the fully-expanded (eight 4-hex groups) and canonical compressed (RFC 5952) forms of an address. IPv4 is…		POST$0.002

Source: x402 Bazaar discovery API (Coinbase CDP) · Licence: Public discovery metadata; descriptions by each provider. Listed in x402 pay-per-call APIs. We list tools; we do not test, rate or endorse them.

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