Networking
Industrial subnet worked examples
Calculate network, broadcast, usable-host range, and same-subnet decisions for common industrial IPv4 prefixes before changing a controller or device address.
- Product
- Industrial Ethernet IPv4 networks
- Level
- Field triage
- Read time
- 9 min
- Reviewed
- 2026-07-15
What to establish before troubleshooting
The subnet mask determines which address bits describe the network and which describe the host. Devices make the same-subnet decision locally before they ever use a default gateway.
Write addresses in CIDR notation and calculate network, broadcast, and usable-host boundaries instead of relying on matching octets by sight.
Abbreviated worked example
Locate 192.168.10.34/24
A controller is configured as 192.168.10.34 with prefix /24.
- 1A /24 mask is 255.255.255.0, leaving eight host bits.
- 2Network is 192.168.10.0; broadcast is 192.168.10.255; typical usable hosts are .1 through .254.
Result: 192.168.10.34 is a usable host on 192.168.10.0/24.
Caution: Industrial networks may reserve address ranges, and host usability must still follow the site addressing plan.
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