{"id":18254,"date":"2026-09-25T20:57:31","date_gmt":"2026-09-25T17:57:31","guid":{"rendered":"https:\/\/www.hyyat.com\/knowledgebase\/how-to-write-an-ipv6-address\/"},"modified":"2026-09-25T20:57:31","modified_gmt":"2026-09-25T17:57:31","password":"","slug":"how-to-write-an-ipv6-address","status":"publish","type":"docs","link":"https:\/\/www.hyyat.com\/en\/knowledgebase\/how-to-write-an-ipv6-address\/","title":{"rendered":"How to Write an IPv6 Address: Format and Shortening Rules"},"content":{"rendered":"
In short:<\/strong> An IPv6 address is made of 8 groups separated by colons (:), and each group is 16 bits written as 4 hexadecimal digits. You can shorten it by removing leading zeros in each group, and by replacing one run of all-zero groups with a double colon (::).<\/div>\n

The full format<\/h2>\n

An IPv6 address is 128 bits long. It is written as 8 groups of 4 hexadecimal digits (0-9 and a-f), separated by colons. For example:<\/p>\n

2001:0db8:0000:0000:0000:ff00:0042:8329<\/code><\/p>\n

Rule 1: remove leading zeros<\/h2>\n

In each group you can drop the zeros at the start. The address above becomes:<\/p>\n

2001:db8:0:0:0:ff00:42:8329<\/code><\/p>\n

Rule 2: replace consecutive zero groups with ::<\/h2>\n

One run of groups that are all zero can be replaced with a double colon:<\/p>\n

2001:db8::ff00:42:8329<\/code><\/p>\n

You can use ::<\/strong> only once in an address; otherwise it would be impossible to know how many groups each one replaces.<\/p>\n

Common examples<\/h2>\n