Networking Calculators

Tools for networks and the web: subnet details for any IPv4 address, CIDR prefixes for a number of hosts, IP address formats, website bandwidth and how long a download will take.

Subnet Calculator

Network, broadcast and host range for an IPv4 subnet.

CIDR Calculator

CIDR prefix for N hosts, and prefix to mask.

IP Address Converter

IPv4 address in decimal, binary and hex.

Bandwidth Calculator

Website data transfer and bandwidth.

Download Time Calculator

Time to download a file at your speed.