To shorten an IPv6 address, you can remove what from each quartet?

To shorten an IPv6 address, you can remove leading zeros from each quartet. A quartet in an IPv6 address is a group of four hexadecimal digits (0-9, A-F) that represent a 16-bit block of the address.

For instance, an IPv6 address like 2001:0db8:0000:0000:0000:0000:0000:0001 can be shortened by dropping the leading zeros in each quartet to form 2001:db8:0:0:0:0:0:1.

This practice helps to make addresses more readable and manageable without losing any information. While it's also possible to use a double colon to represent consecutive zero quartets, which applies to reducing the number of sections that are zero, removing leading zeros is specifically focused on the formatting within each quartet.