Developer Tools

Subnet / CIDR Calculator — Free, No Upload, Browser-Based

🔒 Runs in your browser

Enter any IP address and CIDR prefix length to instantly see the network address, broadcast address, usable host range, subnet mask, wildcard mask, and total host count — all calculated in your browser. No IP address or network data is ever transmitted to a server, making it safe for inspecting internal or sensitive network ranges.

How to use this tool

  1. Type an IP address and adjust the prefix length slider or type a CIDR block like 10.0.0.0/8.
  2. The calculator instantly shows network address, broadcast, subnet mask, wildcard mask, and host range.
  3. Copy any individual value with the Copy button next to each result row.
/
Prefix length/24
/0/8 Class A/16 Class B/24 Class C/32

Network

192.168.1.0/24

PrivateClass C
Network address
192.168.1.0
Broadcast address
192.168.1.255
Subnet mask
255.255.255.0 (/24)
Wildcard mask
0.0.0.255
First usable host
192.168.1.1
Last usable host
192.168.1.254
Usable hosts
254
Total addresses
256

All calculations happen in your browser. No IP addresses are transmitted.

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Subnet / CIDR Calculator — Free, No Upload, Browser-Based | brevio