IP Subnet Calculator Calculate IP Address Subnet Mask (CIDR) Select CIDR /8 /16 /24 /25 /26 /27 /28 /29 /30 Calculate π Toggle Theme Features in this Tool Input IP Address + select CIDR mask. Shows:β Subnet Maskβ Network Addressβ Broadcast Addressβ Total Hosts & Usable Hostsβ First & Last usable IP Light/Dark Theme toggle πβοΈ