Chrome Extension

NetworkCalc — IP & Subnet Tools

Fast IPv4/IPv6 calculators, CIDR converters and checks, MAC OUI lookup, and handy encoders — right in your browser. Works offline.

Add to Chrome See features
Designed for network engineers • Keyboard‑first • No clutter
NetworkCalc logo

What you get

Daily‑driver tools for network engineers.

IPv4/IPv6 Calculators

Subnet size, usable hosts and ranges, IPv6 expand, subnet split.

CIDR Tools & Checks

Mask ↔ prefix converter and “IP ∈ subnet” check.

MAC & Encoders

OUI vendor lookup, Base64, Hex/Dec/IP, URL, ASCII ↔ Hex, MD5.

Screenshots

CIDR
CIDR Converter
MAC OUI
MAC OUI Lookup

Free — with optional supporter perks

Core features are free. Supporters unlock advanced tools.

Free
$0
  • IPv4 calculators
  • Offline
  • No account required
Add to Chrome
Supporter
License Key
$10
  • IPv6, CIDR, MAC OUI
  • Encoders (Base64, Hex/Dec/IP, URL, ASCII ↔ Hex, MD5)
  • Support future development
Boosty Patreon

Enter your key in the extension settings.

FAQ

Yes. IPv4 core tools are free. Some advanced features require a supporter license.

Yes. All calculations are local in your browser; no data is sent to a server.

Open the extension Settings → “License” and paste your key.

Built for Chrome. Often works in Edge/Brave, but not guaranteed.
Contact

Press, partnerships, or bulk keys.