Button Highlighting
The View buttons can be pressed to set the IP address to the Network ID,
Broadcast IP, First Host, Last Host, Next Network, Previous Network, Next IP,
and Previous IP. They are also highlighted if the IP displayed happens to be
one of these as well.
A button is dimmed when its action isn't possible at the current mask —
for example, a /31 or /32 has no room for a First or Last Host, and a /32 has
no Broadcast address.
Keyboard Shortcuts
Subnet mask
- ← — decrease CIDR
- → — increase CIDR
Randomize
- ↑ — Network bits only
- ↓ — Host bits only
- R — Both, keeping the same CIDR
- Space — Everything, including the CIDR
Jump to an address
- N — Network ID
- B — Broadcast IP
- F — First Host IP
- L — Last Host IP
Step
- , — Previous IP
- . — Next IP
- Z — Previous Network
- X — Next Network
Direct Linking
This tool supports linking directly to an IP / CIDR value. Simply add ?ip=5.5.5.5/27 to the URL to go directly to this IP and Mask combination.
Note from Ed
I made this tool for two reasons:
- To help visualize the relationship between CIDR, Binary Subnet Masks, and Subnet Masks.
- To help visualize how the CIDR/Subnet Mask affects an IP address
This was initially a teaching tool for my students, but I thought to give it to the world in hopes that other students (or teachers!) can use it to help in the learning journey.
Feedback? Mention it on my Discord server: pracnet.net/discord.