Groups of IP addresses are used to restrict access to any of your environments. They are particularly useful to group several IPs in a single place and label them clearly (e.g Office, Home, etc.).
To create a group of IP addresses, navigate to the Project Settings and select 'Security'. From here, you can review existing groups and create a new group by clicking on 'Add Group'.
Provide a name to your group and the list of IP adresses you want to group and click 'Add'. After creation, you will either be able to edit or remove the group you have just created.
You can now allow this group of Ip addresses on an environment, see this procedure.