Free Networking & Server Tools

Calculate the network, broadcast, host range, masks and more from any IPv4 address and CIDR, with a binary view and subnet splitting.

Expand, compress and analyze any IPv6 prefix: address range, total addresses, /64 counts, reverse DNS and prefix splitting.

Identify the vendor behind any MAC address or OUI prefix, with block details, randomized-MAC detection, format conversions, and bulk lookup.

Run live BGP route lookups, pings and traceroutes from our own network. See how a prefix is actually routed across the internet.

Work out usable capacity, fault tolerance, efficiency and overhead for RAID 0, 1, 5, 6, and 10, with the TB vs TiB difference made explicit.

Convert a port speed into monthly data transfer and back (Gbps and Mbps to TB per month, with utilization) and see how 95th-percentile, metered, and unmetered billing compare.

Expand a CIDR block into its first and last address, or collapse an arbitrary start–end IP range into the smallest set of CIDR blocks, both directions, instantly.

Check all three email-authentication records for any domain in one click: SPF policy and lookup count, DKIM key and selector, and DMARC alignment and policy, each graded and explained.