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IPv4 Subnet Calculator

Calculate network, broadcast, host range, and mask details from a CIDR block.

Quick context
  • Runs entirely client-side with no server dependency.
  • Built for copy-paste workflows and fast iteration.
  • Optimized for desktop and mobile editing sessions.
ipv4cidrnetwork
CIDR input
Mask
255.255.255.0
Network
192.168.1.0
Broadcast
192.168.1.255
First host
192.168.1.1
Last host
192.168.1.254
Total addresses
256
Usable hosts
254

Subnet details