network tools
subnet
/
calc
IPv4
IPv6
Network class
Any
A
B
C
IP address
Subnet mask
Calculate
Enter a valid IPv4 address, like 192.168.1.10.
IP address
You can use :: for the shortened format
Prefix length
Calculate
Enter a valid IPv6 address, like 2001:db8::1.
Where the mask cuts
network bits
host bits
IP subnet