Useful tools, with visible limits.

Calculate IPv4 and IPv6 subnet boundaries, exact address counts and masks. Explore the prefix visually and split a network into smaller blocks.

Independent, practical and free to use

IP Calculator is part of our independently operated internet-utility network. You do not need an account or an advertising click to use the core tool. The field guide explains its assumptions and links to primary documentation.

Observations, not invented certainty

We do not fabricate measurements, infer identity from an IP address or label a planning estimate as a live test. The main tool operates locally in your browser. Nothing here changes your network configuration.

How the network is funded

We currently display labeled promotions for our companion sites. No paid advertising, sponsored rankings or affiliate tracking is active. Future commercial links must be disclosed and kept separate from tool results.