Networking

Subnets, CIDR, IP ranges, throughput and latency.

• Bandwidth-Delay Product Calculator How much data is in flight on a link, and the TCP window needed to keep it full.
• IP Range to CIDR Calculator The smallest set of CIDR blocks that exactly covers a range of IPv4 addresses.
• IPv4 Subnet Calculator: Network, Broadcast and IP Range The network and broadcast addresses, usable IP range, mask and host count for an IPv4 address in CIDR notation.
• IPv6 Subnet Calculator The network, last address, address count and /64 count of an IPv6 prefix, in full and compressed forms.
• Latency and Round-Trip Time Calculator The best-case one-way latency and round-trip time over a distance, with hops and serialisation delay.
• Port Range Calculator How many TCP or UDP ports a range holds, and how it splits between system, user and dynamic ports.
• Subnet Mask Calculator Convert between a subnet mask and its CIDR prefix, with the wildcard mask and host count.
• TCP Throughput Calculator The maximum TCP throughput a connection can reach, given its window, round-trip time, packet loss and link speed.
• Usable Hosts Calculator The smallest IPv4 subnet that holds a given number of hosts, and the host count of nearby prefixes.
• VLSM Subnet Calculator Split an IPv4 network into up to six subnets sized for the hosts each one needs.