About NetCalcTools

NetCalcTools is a free, growing collection of tools built for network engineers, students, system administrators, and anyone who works in networking or IT. Our goal is simple: give you accurate results instantly, without ads getting in the way, without a login wall, and without unnecessary clutter.

Why we built this

Most online tools are either buried in ads, hidden behind sign-up walls, or built on outdated interfaces that are painful to use on a phone. We wanted tools that are fast, accurate, accessible, and genuinely pleasant to use — whether you're studying for a CCNA exam, configuring a VLAN, generating a secure password, or double-checking a CIDR range at 2 AM.

What's available today

The IP Subnet Calculator supports full IPv4 subnetting (network address, broadcast address, usable host range, subnet mask, wildcard mask, CIDR notation) and IPv6 subnetting (network prefix, address range, total addresses), plus a full IPv4 subnet reference table from /1 to /32. The Password Generator creates cryptographically random passwords and passphrases with a live strength meter. More tools are on the way — see the homepage for what's coming next.

Accuracy & privacy

Every calculation and every generated password runs entirely in your browser using standard client-side logic — no data is sent to a server, and nothing you enter is ever logged or stored.

Get in touch

Found a bug or have a feature request? We'd love to hear from you. This is an independently run project, continuously improved based on real user feedback.