Looks like this is poorly described in the admin interface. For comparison, Sreened emails tab is described as follows:
When someone tries to create a new account, the following email addresses will be checked and the registration will be blocked, or some other action performed
Screened IPs tab is described differently and is more ambiguous:
IP addresses that are being watched. Individual IP addresses can be allowlisted.
We can change this to match:
When someone tries to create a new account, the following IP addresses will be checked and the registration will be blocked, or some other action performed.
@supermathie can you confirm this is accurately describing things? If so I can make the change.