Work with IP addresses, subnets, and CIDR with ease
IP addressing is full of small, error-prone calculations. Does this address fall inside that subnet? What range does a /22 actually cover? How do I turn a messy list of addresses pulled from a log into something sorted and deduplicated? The tools in this category handle exactly these tasks, replacing manual binary math and spreadsheet gymnastics with instant, reliable answers for both IPv4 and IPv6.
Everything runs locally in your browser, so you can safely paste internal address plans, firewall rules, or production logs without any of that information leaving your machine.
Tools in this category
- IP Validator — Check whether an address is a valid IPv4 or IPv6.
- IP Subnet Checker — Test whether an address belongs to a given subnet.
- IP Sort & Compare — Sort, deduplicate, and compare lists of addresses.
- IP Text Extractor — Pull every IP address out of free-form text or logs.
- IP Address Generator — Generate addresses for testing.
- Subnet Generator — Split a network into subnets and list their ranges.
- CIDR to IP Range — Expand a CIDR block into its first and last address.
- IP Range to CIDR — Collapse an address range into minimal CIDR blocks.
- MAC Lookup — Identify the hardware vendor behind a MAC address.
Common use cases
Network and system engineers use these utilities to plan and document address space, audit firewall and ACL rules, clean up the IP lists that appear in incident investigations, and translate between the CIDR notation configuration files prefer and the explicit ranges humans find easier to reason about. The MAC lookup is handy when inventorying devices on a network. Each tool includes a clear explanation of the underlying concept, from subnet masks to the structure of a MAC address.
Frequently asked questions
Do these tools support IPv6? Yes. Validation, subnet checks, and conversions handle both IPv4 and IPv6 where applicable.
Where does the MAC vendor data come from? It is matched against the public IEEE OUI registry, bundled with the tool so the lookup works entirely offline in your browser.
Is my address data sent anywhere? No. All parsing and calculation happens locally, so internal network details stay private.