🖧Online network tools (IP, CIDR)
This category brings together network tools for admins and developers: IPv4 subnet calculator, CIDR notation conversion and chmod permission converter. Compute address ranges and masks in an instant, right in the browser.
Compute Unix permissions (octal ↔ symbolic): read, write, execute.
Convert an IPv4 address range (start–end) into the minimal CIDR blocks.
Convert an IPv4 address to a decimal integer, binary and hexadecimal.
Calculate an IPv4 / CIDR subnet: mask, range, broadcast and host count.
Expand an IPv6 address to full form and compress it (::).
Look up a network port number and its associated service (common ports reference), in your browser.
Generate a random MAC address (configurable format and separator), in your browser.
Frequently asked questions
How do I calculate an IPv4 subnet?
Enter an IP address and a mask or CIDR notation: the tool shows the network address, host range, broadcast and number of available addresses.
What does CIDR notation /24 mean?
The /24 suffix means the first 24 bits identify the network, i.e. a 255.255.255.0 mask and 254 usable hosts.