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Subnet Calculator (IPv4 & IPv6)
Work out the network, broadcast, mask, host range and size of any IPv4 or IPv6 subnet, and split it into smaller ones. -
Chmod Calculator
Convert Linux file permissions between octal (755), symbolic (rwxr-xr-x) and chmod’s u=,g=,o= form, with special bits explained. -
Uptime & SLA Calculator
See how much downtime an availability target allows per day, month and year, turn an outage into a percentage, and combine components. -
Bandwidth & Transfer Time Calculator
Estimate how long a file takes to transfer at a given speed, and convert between monthly traffic and average bandwidth. -
RAID Calculator
Compare usable capacity, fault tolerance and speed for RAID 0, 1, 5, 6, 10, 50 and 60 with any number of disks. -
Data Size Converter
Convert between bytes, KB, MB, GB, TB and KiB, MiB, GiB, TiB, and bits, and see why a 1 TB drive shows as 931 GB.
Infrastructure Tools
Plan networks, servers and storage: subnets, file permissions, uptime targets, bandwidth, RAID and data sizes. Everything runs in your browser.