network engineering / addressing tools

Subnet/Calculator

Calculate IPv4 and IPv6 network ranges, prefix lengths, subnet masks, address counts and binary boundaries using an interactive engineering reference.

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IPv4 / IPv6 calculator Binary address breakdown Subnet calculation results

IPv4 · IPv6
Prefix / mask calculations
Click results to copy

Network class

IP address

Subnet mask

Enter a valid IPv4 address, like 192.168.1.10.

IP address

You can use :: for the shortened format

Prefix length

Enter a valid IPv6 address, like 2001:db8::1.

Where the mask cuts

network bits host bits

IP subnet

Click any result to copy it.

NETWORK ENGINEERING / SUBNET CALCULATOR