6 Tips for Working with IP Addresses and Subnets

6 Tips for Working with IP Addresses

1. Always Account for Two Reserved Addresses

In every subnet, the first address is the network address and the last is the broadcast address. A /24 has 254 usable hosts, not 256.

2. Plan with a Buffer

When designing a network, allocate at least a 30% address buffer for future growth.

3. Use CIDR Instead of Classful Addressing

CIDR allows you to flexibly carve subnets of the needed size without being tied to the outdated Class A, B, C system.

4. Document the Address Plan

Maintain a subnet allocation table. This prevents address conflicts and simplifies administration.

5. Separate Services by Subnets

Allocate separate subnets for servers, workstations, Wi-Fi, and IoT devices. This improves security.

6. Check for Overlaps

Before adding a new subnet, make sure it does not overlap with existing ones. The IP calculator will show the full range.

Verify your calculations with the IP Calculator.

See also: Subnet Calculator, MAC Lookup