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Subnet calculator

IPv4 CIDR calculator. Real-time as you type.

Quick presets
Network address
192.168.1.0
Broadcast address
192.168.1.255
Subnet mask
255.255.255.0
Total IPs
256
Usable hosts
254
Host range
192.168.1.1 — 192.168.1.254
Wildcard mask
0.0.0.255
Binary mask
11111111.11111111.11111111.00000000

Install errorbudget tools

Add to your home screen — works offline, opens like a native app.

Why install
  • ✓ Works completely offline
  • ✓ Opens instantly from home screen
  • ✓ No ads, no tracking, no signup
  • ✓ Free forever
1
Open this page in Safari (other browsers won't work for install on iOS).
2
Tap the Share button at the bottom of Safari (square with arrow up).
3
Scroll down and tap "Add to Home Screen".
4
Tap "Add" in the top right. The app icon appears on your home screen.
1
Open this page in Chrome or Edge.
2
Tap the menu button (⋮) at the top right.
3
Tap "Install app" or "Add to Home screen".
4
Confirm by tapping Install. App appears in app drawer + home screen.
1
Use Chrome, Edge, or Brave browser.
2
Look for the install icon (⊕) on the right side of the address bar.
3
Click it, then click "Install".
4
App opens in its own window. Pin to taskbar/dock for quick access.