Networking
Visual Subnet Calculator
Divide a network into subnets by clicking, then join them back. Shows address ranges, usable IPs, netmasks and host counts — and encodes your whole division into a shareable link. Look up a single address to see every network it belongs to and which reserved block it falls in.
Presets:
Look up a single address
Which blocks is it inside, and what could it be a subnet of?
Every network it belongs to
Widest mask first. Pick one to load it into the table above and start dividing.
| Prefix | Network | Range | Netmask | Hosts | Load |
|---|
Show columns
Click Divide to split a subnet in two. Click a bracket in the Join column to merge everything under it back together.
Subnets
| Subnet address | Netmask | Range of addresses | Useable IPs | Hosts | Divide | Join |
|---|
Runs entirely in your browser — nothing you type here is uploaded, logged or stored. Privacy policy