Free online Network calculators.
Calculate how long a file transfer will take based on file size, connection speed, and protocol overhead — or find the bandwidth needed to hit a target time.
Professional IPv4 subnet calculator for network administrators. Calculate network addresses, broadcast addresses, usable host ranges, and CIDR masks with ease.
Professional IPv6 subnet calculator. Plan your 128-bit network architecture, calculate prefix boundaries, and handle IPv6 address compression and expansion with ease.
Calculate usable capacity, space efficiency and the number of drive failures survived for RAID 0, 1, 5, 6, 10, 50, 60, ZFS RAID-Z and JBOD, with hot spares and TB or TiB display. Free.
Free SLA uptime calculator. Convert an availability percentage such as 99.9% or 99.99% into allowed downtime per day, week, month, quarter and year, work back from downtime to uptime, and combine components in series or parallel.
Plan a VLSM subnet layout: give a network and the hosts each subnet needs, and get the CIDR block, mask, usable range and broadcast address for each, largest first, with free space left. Free.