Networking.

Network planning and troubleshooting tools that calculate instantly in your browser. Subnet an address range, convert between IP formats, or look up CIDR blocks — no installs, no data sent to any server. Useful for sysadmins, network engineers, and developers configuring firewalls, VPCs, or routing tables.

Bookmark this page to quickly access all your networking tools, or save individual tools to your browser favorites.