🌐 IP Subnet Calculator

Enter an IPv4 address with CIDR notation (e.g. 192.168.1.0/24) or a separate subnet mask to get full subnet details.

IP Address / CIDR

Enter as CIDR (e.g. 192.168.1.0/24) or just an IP address with the mask below.

Subnet Mask (if not using /prefix)

Leave blank if using CIDR notation above.

Common Subnet Masks