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Networking tools.

Subnet, CIDR, IP and DNS calculators that do exact 32- and 128-bit math in your browser.

6 tools All tools

Networking tools

  • Networking Live

    Subnet Calculator

    Network, broadcast, mask and host range from any IPv4/IPv6 CIDR.

    Enter an IPv4 or IPv6 address with a prefix and get the network and broadcast addresses, netmask, wildcard, usable host range and address counts. Pure client-side.

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  • Networking Live

    IP Address Converter

    Convert an IP between dotted decimal, integer, hex and binary.

    Paste an IPv4 or IPv6 address in any form — dotted decimal, integer, hexadecimal or binary — and see every representation at once. Pure client-side.

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  • Networking Live

    CIDR / Subnet Checker

    Check an IP against CIDR ranges, find overlaps, and merge lists.

    Paste an IP plus CIDRs — or a whole list — to check membership, spot overlapping or contained ranges, and get the minimal covering set. Pure client-side.

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  • Networking Live

    MAC Address Formatter

    Reformat a MAC across colon, hyphen, Cisco and bare — and read its bits.

    Paste a MAC address and get it normalised across colon, hyphen, Cisco dotted and bare forms, plus the U/L and I/G bit meaning, OUI and the EUI-64 IPv6 link-local address it derives. Pure client-side.

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  • Networking Live

    Reverse DNS / PTR Helper

    Build the in-addr.arpa / ip6.arpa PTR name and reverse zone for any IP.

    Enter an IPv4 or IPv6 address or CIDR and get the in-addr.arpa or ip6.arpa PTR name, the matching reverse zone and the nibble breakdown behind it. Pure client-side.

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  • Networking Live

    Subnet Splitter

    Split a parent CIDR into subnets and find the free space around allocations.

    Split a parent IPv4 or IPv6 CIDR into equal subnets or carve it up with VLSM, then list existing allocations to find the gaps and the next available subnet. Pure client-side.

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