IP Range Calculator

How to use the IP Range Calculator

1. 1

   Choose From CIDR / mask, enter an IPv4 address and a prefix such as /24, then read the full range and usable IPs.

2. 2

   Or switch to From first → last IP and paste the start and end addresses to count every address in that span.

3. 3

   Use the example chips for common home-network and CCNA lab blocks while you practise.

Why IP range maths shows up every week in networking

DHCP pools, firewall object groups, and access lists all care about contiguous ranges. Beginners often quote a /24 correctly as 256 addresses, then forget that two of those are reserved. Network engineers still verify ranges before a change window because an off-by-one error routes traffic into the wrong broadcast domain. Practising with CIDR and with raw start-end bounds builds the habit you need for Cisco networking labs and day-to-day network administration.

IPv4 range example

Guides and next steps

• CIDR notation explained (with worked examples)
• Private network IP address ranges
• Free CCNA practice tests