Enter a CIDR block to see network address, broadcast address, usable host range, and total host count instantly.
Did this tool save you some time? A quick testimonial helps a lot.
Enter a CIDR block to see network address, broadcast address, usable host range, and total host count instantly. Common questions — like does this support ipv6 cidr blocks — are answered in the FAQ below.
Add your input to the workspace above, review the result, then copy or download it when it's ready. No account or installation is required.
CIDR / Subnet Calculator runs in your browser, so the information you enter stays on your device instead of being uploaded to a server.
A few worked examples so you know what to expect before you paste in your own input.
Input
192.168.1.0/24
Output
Network: 192.168.1.0 · Broadcast: 192.168.1.255 Usable range: 192.168.1.1 – 192.168.1.254 (254 hosts)
Input
10.0.0.0/28
Output
Network: 10.0.0.0 · Broadcast: 10.0.0.15 Usable range: 10.0.0.1 – 10.0.0.14 (14 hosts)
Input
172.16.0.0/30
Output
Network: 172.16.0.0 · Broadcast: 172.16.0.3 Usable range: 172.16.0.1 – 172.16.0.2 (2 hosts)
CIDR notation packs a network address and subnet size into one string. Here's how to read it, calculate ranges by hand, and where people get it wrong.
Related Tools