IPv6 Expander & Compressor
Expand or compress any IPv6 address.
Expanded (full)
2001:0db8:0000:0000:0000:0000:0000:0001
Compressed
2001:db8::1
Free online IPv6 expander and compressor. Paste a compressed IPv6 address to see its full form, or a full address to get the shortest valid compressed form. Follows RFC 5952. Runs in your browser.
How to use the IPv6 Expander & Compressor
- 01Paste any IPv6 address, compressed or full.
- 02See both the fully expanded and the compressed forms.
- 03Copy whichever notation you need.
Frequently asked questions
How does IPv6 compression work?
The longest run of consecutive zero groups is replaced with :: (only once), and leading zeros within each group are dropped. This tool produces the shortest RFC 5952 form.
Why expand an IPv6 address?
The full, expanded form has all eight four-digit groups written out, which some tools and access lists require and which makes addresses easier to compare exactly.