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Network Tools
Free networking tools for IPv4 and IPv6 — subnet and CIDR calculators, IP range and class lookups, wildcard masks, random MAC and IP generators, and a common-ports reference.
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IPv4 Subnet Calculator
Calculate netmask, network, broadcast, host range and counts from an IP and CIDR.
↔CIDR to IP Range
Convert CIDR notation to a first/last IP range, or an IP range to covering CIDR blocks.
::IPv6 Expander
Expand an IPv6 address to its full eight-group form or compress it to :: shorthand.
MACMAC Address Generator
Generate random locally-administered unicast MAC addresses in your chosen format.
:80Common Ports Reference
Search a table of well-known TCP and UDP port numbers and their services.
A·BIP Address Class
Identify the class, type and default mask of any IPv4 address.
0.0Wildcard Mask Converter
Convert freely between CIDR prefix, subnet mask and wildcard mask.
#.#Random IP Generator
Generate random IPv4 or IPv6 addresses, optionally restricted to public ranges.