Networking

IPv6 Compressor / Expander

Shorten or expand an IPv6 address using consistent zero-compression rules.

Calculations run in your browser. The tool does not send your inputs to a server.

01Your inputs

Local workspace

Start with the sample below, or enter your own values.

IPv6

02Your result

Your result will appear here. Choose an action after checking your inputs.

A quick guide

How to use this tool

Check the example and the unit beside each input.
Enter your values and choose Calculate.
Review the result and assumptions, then copy what you need.

Reset example restores the starting values. Clear removes text and number inputs, returns choices to their first valid option, and removes the result.

Reference guide

Explanation and worked examples

The compressed and expanded forms identify the same address. A double colon replaces one consecutive group of zero fields.

Use in day-to-day IT work

Prepare addressing or transfer estimates for a network change, migration or support ticket.

Checks before applying the result

Compare the result with IPAM, VLAN boundaries, routes and DHCP reservations before allocating addresses.
Use measured sustained throughput for time estimates; link speed alone excludes contention and protocol overhead.

New to the terminology?

CIDR: An address block written with a slash and prefix length, such as /24.
Prefix: The number of address bits fixed to identify a network.
Mbps: Millions of bits per second. Divide by eight to compare with MB/s.

Keep exploring

How calculations work and where the models stop →