Point-to-point and host routes
/31 is treated using both addresses and /32 as one address instead of applying the traditional network/broadcast subtraction.
Network calculator
Calculate an IPv4 subnet precisely.
Enter an IPv4 address and CIDR prefix to get network boundaries, netmask, wildcard, broadcast and usable addresses.
Result
Calculated values
Integer arithmetic
The calculation uses 32-bit integer masks rather than string approximations.
Local calculation
The entered address never needs to leave your browser.
Do not confuse range with routing
A subnet calculation describes address boundaries; routing, DHCP and firewall policy are separate decisions.