Free network tool
Calculate an IPv4 CIDR network address, broadcast, subnet mask, wildcard mask, usable host range, and address count entirely in your browser.
Your result will appear here.
About this tool
Enter an IPv4 address and choose a common subnet prefix, or enable manual CIDR entry, to calculate its range, masks, broadcast address, and usable host count.
The common-mask selector supplies the prefix unless manual CIDR mode is enabled. The four IPv4 octets are converted to a 32-bit value and the prefix mask derives network and broadcast boundaries without contacting the address.
Common uses
Scope
Worked example
Use the prefilled value in the tool above or paste a similar value of your own.
192.168.10.42/24
Network: 192.168.10.0/24 · Broadcast: 192.168.10.255 · Hosts: 192.168.10.1–192.168.10.254 · Usable: 254
Quick answers
It means the first 24 of 32 address bits identify the network, equivalent to subnet mask 255.255.255.0.
A /31 is treated as a two-address point-to-point network under RFC 3021, while a /32 represents one host route.
No. The value is treated only as a number for local subnet arithmetic.