If your IP address is not authorized, you will see a page like this when you try to log in:
This notification is also available via this link: docs.intakt.com/403.php
The address listed here is the IP address to be added to the filter to gain access to the CMS.
You can also request your IP address via intakt.com/ip-address Both your ipv4 and your ipv6 address are listed here (if your internet service provider gave just one address to you, the missing address says "not detected")
If you have two IP addresses at your disposal (an ipv4 and an ipv6), it may be convenient to authorize both of them / add both of them to the whitelist.