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IPv4 subnet calculator

Explore an IPv4 network, its subnet mask, address range and host counts.

Your IPv4 network192.168.1.0/24
24 network bits8 host bits
Octet 1 192
Octet 2 168
Octet 3 1
Octet 4 42

Tap a bit to set the prefix. Filled bits belong to the network; outlined bits belong to the host.

Subnet mask255.255.255.0
Wildcard mask0.0.0.255
Total addresses256
Host count254
First host192.168.1.1
Last host192.168.1.254
Broadcast192.168.1.255
Address modelConventional network and broadcast exclusions
Entire address range192.168.1.0 → 192.168.1.255
Number of network bits, from 0 to 32.

Try /31 for a point-to-point pair or /32 for a single-address route.

Processed on your device

How it works & useful details

How it works & limits

Enter an IPv4 address and a prefix from /0 to /32. The host bits are cleared to find the network; the range includes both endpoints. IPv4 octets use decimal notation without leading zeros.

/31 uses both addresses on a point-to-point link under RFC 3021. /32 represents one address. Other host counts exclude the network and broadcast addresses. Special-purpose ranges may have additional restrictions; this calculation does not establish availability.

Your working space

Explore the live view, then save copyable text and a downloadable file. Everything is calculated locally. Inputs are not stored; refreshing clears them.

These tools inspect address notation and ranges. They do not contact addresses, check availability or establish connectivity.