Network Tools

Type a value into any field. Related fields update instantly.

CIDR calculator

Enter an IPv4 or IPv6 address with a prefix length, e.g. 192.168.1.10/24 or 2001:db8::/32. Without a prefix length the address is treated as a single host.

Enter a valid IPv4 or IPv6 address with a prefix length, e.g. 192.168.1.10/24.

IPv4 address

Type a value into any octet field. The same octet is updated in the other notations.

IPv4 address (decimal)
Octets are numbers from 0 to 255.
IPv4 address (hexadecimal)
Octets are two hexadecimal digits (00 to FF).
IPv4 address (binary)
Octets are up to eight binary digits (0 and 1).

IPv6 address

Type an IPv6 address in any notation, with or without ::. All forms are shown below.

Not a valid IPv6 address, e.g. 2001:db8::1.

MAC address

The canonical form of a MAC address has the bits of every byte in reverse order (least significant bit first, as Ethernet sends them). Type an address into either field to see the other. Separators such as - : . are accepted.

A MAC address has 12 hexadecimal digits (0-9, A-F), e.g. 00-1A-2B-3C-4D-5E.
A MAC address has 12 hexadecimal digits (0-9, A-F), e.g. 00-1A-2B-3C-4D-5E.