IP Subnet Calculator

Enter an IPv4 address and CIDR prefix (or dotted mask) to get the network address, broadcast, usable host range, wildcard mask, total hosts and binary representation.

100% free No uploads Runs in your browser No signup

IP subnet calculator

IPv4 address

Prefix length (CIDR)

0–32 · netmask 255.255.255.0

Network /24

Network address

192.168.1.0/24

Netmask

255.255.255.0

Wildcard mask

0.0.0.255

Broadcast

192.168.1.255

First host

192.168.1.1

Last host

192.168.1.254

Total addresses

256

Usable hosts

254

IP class

Address in binary

11000000.10101000.00000001.00001010

Netmask in binary

11111111.11111111.11111111.00000000

/24 is the classic home network (256 addresses, 254 usable); /30 is used for point-to-point links (2 usable). For /31 (RFC 3021) both addresses are usable, and /32 denotes a single host. Private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.

How to use the IP Subnet Calculator

1
Open the tool above — it is already running, no install or account needed.
2
Enter your input and adjust the options to match what you need.
3
Copy or download the result — everything was processed locally in your browser.

Private by design

This tool runs 100% inside your own browser using local JavaScript — your input never touches a server. That makes it instant, offline-capable in many cases, and private even for sensitive data.

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