OT Network Calculator
Break down an IPv4 subnet for PLC, SCADA and DCS networks: network and broadcast address, usable range, wildcard mask and binary view.
Free, no account needed. Everything runs in your browser; nothing you enter is sent to a server.
Subnet
Enter an IPv4 address with a prefix length or subnet mask. The result updates as you type.
For example 10.0.0.1/16. The address does not have to be the network address; any address inside the range works.
Load an example
Result
| Property | Value | Copy |
|---|---|---|
| Entered address | — | |
| CIDR notation | — | |
| Subnet mask | — | |
| Wildcard mask | — | |
| Network address | — | |
| Broadcast address | — | |
| First usable address | — | |
| Last usable address | — | |
| Total addresses | — | |
| Usable addresses | — | |
| Class (classful) | — | |
| Type | — |
Binary view
Network bits are shown bright, host bits dim.
Export and share
Notes on this subnet
The notes are derived only from the calculated values and published addressing rules (RFC 1918, RFC 3021).
How to use it
- Enter the address. Start with CIDR notation (192.168.10.0/24) or an address and subnet mask.
- Read the result. See the network and broadcast address, usable range, wildcard mask and binary view.
- Share the plan. Share the subnet as a link or export usable addresses as CSV.
Common questions
How is the usable host count calculated?
The network and broadcast addresses are subtracted from the total address count. A /24 has 256 − 2 = 254 usable addresses.
Which addresses are private?
The RFC 1918 private ranges are 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. The tool tells you whether the address you enter is private or public.
How should I divide subnets on an OT network?
Separating subnets by production cell or function makes firewall rules and troubleshooting simpler. See our network planning article for details.
Planning an IT/OT project?
Describe your machine, data flow or production goal in a few sentences and the ASP Dijital team will reply by email.