The Kali Linux distribution has two repositories, which are mirrored world-wide:

• http.kali.org (mirrorlist): the main package repository;
• cdimage.kali.org (mirrorlist): the repository of pre-built Kali ISO images.

When using the default hosts listed above, you’ll automatically be redirected to a mirror site which is geographically close to you, and which is guaranteed to be up-to-date. If you prefer to manually select a mirror, click on the mirrorlist link near each hostname above and select a mirror that suits you. You will then need to edit your /etc/apt/sources.list file accordingly with the chosen values.