IPv4/6 Subnet Calculator

Enter a network in CIDR notation:

Network (CIDR)
?Enter IPv4 (e.g., 192.168.1.0/24) or IPv6 (e.g., 2001:db8::/32) in CIDR notation Link

Subnet Table

Use Divide to split a subnet into two smaller subnets, or Join to merge adjacent subnets back together. For IPv6, the hierarchy context rows above show the standard allocation boundaries containing your network.

Clipboard Network address Netmask ?Display format: DEC (255.255.255.0), HEX (0xFFFFFF00), BIN (binary octets) DECHEXBIN Wildcard ?Inverse of netmask, used in ACLs (e.g., 0.0.0.255 for /24) Range of addresses First usable Last usable Hosts Capacity ?Number of child allocations: /32→/48s, /48→/56s, /56→/64s, /64→hosts Reverse DNS ?ip6.arpa zone delegation string for DNS PTR records Broadcast Total IPs Divide ?Split a subnet into two smaller subnets Join ?Click a mask to merge adjacent subnets back together
Clipboard table: { } CSV