IPv6 Subnet Calculator
Calculate an IPv6 network prefix, subnet mask, full address range, and address count from an IPv6 address and prefix length.
Technical calculators
Network calculators
IP addressing and link-performance math that's easy to get wrong by hand: subnet boundaries, the Mbps-versus-MB/s mixup, and how round-trip time limits TCP throughput on long or high-latency paths. Each calculator below states its formula and the specific mistake it guards against.
CIDR and Subnet Calculator
Calculate IPv4 network, mask, wildcard, usable range, RFC address type, AWS/Azure/GCP usable hosts, subnet splits, and VLSM plans from one CIDR.
Bandwidth Transfer Time Calculator
Estimate file transfer time from size, link speed, and protocol efficiency, with decimal and binary units, a deadline check, and common link speeds.
Bandwidth-Delay Product Calculator
Calculate the BDP, required TCP window and window scale, window-limited throughput, and Mathis loss-limited throughput for a path.