Networking tools
Every SubnetKit calculator, free and running entirely in your browser. Nothing is uploaded, and results appear as you type.
Subnet calculator
The main IPv4 subnet calculator with binary, mask, and wildcard.
CIDR calculator
Expand a CIDR block into its full address range and host count.
Subnet mask calculator
Convert between prefix length and subnet mask, both directions.
Wildcard mask calculator
Turn a subnet mask into the wildcard mask used in Cisco ACLs.
Supernet calculator
Summarize multiple networks into one aggregate CIDR route.
IPv6 subnet calculator
Expand, compress, and subnet any IPv6 prefix.
IP converter
Convert an IP between decimal, integer, binary, hex and octal.
MAC address formatter
Reformat a MAC address between colon, dash, dotted and bare forms.
Random IP generator
Generate random valid IPv4 addresses, public or private, for testing.