This example demonstrates how to segment a small office network using IPv4 subnetting for better organization, performance, and security.
| Device Category |
Estimated Count |
| Client PCs |
30 |
| Server PC |
1 |
| NAS |
1 |
| CCTV Cameras (IP) |
15 |
| Printers |
4 |
| Wireless Access Points |
3 |
| Networking Devices |
2–3 |
| Total Estimate |
~55 devices |
- Use 192.168.X.X private IP range (Class C)
- Allocate just enough IPs per group to avoid waste
- Improve security, isolation, and network monitoring
- Reserve space for future growth
| Subnet Name |
CIDR |
IP Range |
Hosts |
Devices Covered |
| Clients |
192.168.10.0/26 |
192.168.10.1 – .62 |
62 |
30 PCs + room for expansion |
| Servers & NAS |
192.168.20.0/29 |
192.168.20.1 – .6 |
6 |
1 Server + 1 NAS + IT access |
| CCTV Cameras |
192.168.30.0/27 |
192.168.30.1 – .30 |
30 |
15 IP cameras |
| Printers |
192.168.40.0/28 |
192.168.40.1 – .14 |
14 |
4 Printers |
| Access Points |
192.168.50.0/28 |
192.168.50.1 – .14 |
14 |
3 APs + Management + spare |
| Networking Infra |
192.168.60.0/29 |
192.168.60.1 – .6 |
6 |
Router, Switch, Firewall |
| Reserved |
192.168.100.0/25 |
192.168.100.1 – .126 |
126 |
Future growth, guests, test lab |
| CIDR |
Subnet Mask |
Usable Hosts |
Best Used For |
| /29 |
255.255.255.248 |
6 |
Servers, infra, NAS |
| /28 |
255.255.255.240 |
14 |
APs, printers, small groups |
| /27 |
255.255.255.224 |
30 |
Cameras, small devices |
| /26 |
255.255.255.192 |
62 |
Client PCs and growth |
| /25 |
255.255.255.128 |
126 |
Future expansion/reserve |
| Subnet |
Access Controls Example |
| Clients |
Allow Internet, internal file shares |
| Servers |
Restricted access from IT/Admin VLAN only |
| Cameras |
No Internet; only NVR or viewing stations access |
| Printers |
Access from client subnet only |
| APs |
Separate VLAN for guest Wi-Fi |
| Infra Devices |
SSH/Web UI access from IT IPs only |
- Use VLANs to enforce segmentation at Layer 2
- Assign static IPs to servers, NAS, printers, and APs
- Set
.1 as gateway address in each subnet
- Reserve
.254 or .253 for network monitoring
- Use DHCP for client PCs only
| Category |
Total |
| Subnets used |
6 + 1 reserve |
| Hosts covered |
~200 |
| Class Used |
IPv4 Private Class C |
| Isolation Method |
VLAN + Subnetting + Firewall ACLs |
💡 Smart subnetting improves not just IP efficiency, but also network control, diagnostics, and long-term scalability.