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Networking calculators.
IPv4 Subnet, CIDR and VLSM calculator
Analyse IPv4 networks, convert masks and CIDR prefixes, split subnets and create VLSM address plans.
Open calculator → Most popular IPv6IPv6 Subnet Calculator calculator
Expand and compress IPv6 addresses, analyse prefixes, classify addresses and plan numbered /64 LAN subnets.
Open calculator → Most popular BandwidthBandwidth and Data Transfer Calculator calculator
Calculate transfer time, required bandwidth or transferable data with bit, byte, decimal, binary and throughput-efficiency options.
Open calculator →Networking Calculators
Calculate address ranges and plan IP networks without converting every octet by hand.
IPv4 Subnet, CIDR and VLSM Calculator
Analyse an IPv4 address with a CIDR prefix, subnet mask or host requirement. View the usable range, binary network boundary, wildcard mask and adjacent networks, or allocate multiple VLSM subnets from one parent block.
IPv6 Subnet Calculator
Expand and compress IPv6 addresses, inspect the first and last address in a prefix, identify global, unique-local, link-local and multicast ranges, generate reverse-DNS names and divide a site allocation into numbered /64 LANs.
Bandwidth and Data Transfer Calculator
Calculate how long a file transfer will take, determine the connection bandwidth required for a deadline, or estimate how much data can move during a chosen period. Compare bits and bytes, decimal and binary units, and adjust for usable throughput.
Why network planning matters
Address plans prevent overlapping ranges and make routing policies easier to maintain. Bandwidth planning complements them by estimating capacity, transfer windows and the effect of real-world throughput.