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100% Local In-Browser Calculation
Subnet & IP CIDR Calculator
Calculate IP netmask, broadcast address, usable hosts range, and binary breakdown 100% locally.
IP & CIDR Prefix Input
RFC 1918 Private IPSubnet Mask
255.255.255.0
Network ID
192.168.1.0
Broadcast IP
192.168.1.255
Usable Host Range
192.168.1.1 — 192.168.1.254
Total Usable Hosts
254 Hosts
Binary Breakdown
IP Address (Binary)
11000000.10101000.00000001.10010110
Subnet Mask (Binary)
11111111.11111111.11111111.00000000
CIDR Prefix Breakdown
The first /24 bits are reserved for network routing. The remaining 8 host bits allow 254 usable IP addresses.