Placeholders for IP address

What is the placeholders for IP address so that I can put as part of registration?


Is there any option to add a Ip deny list/Country blocked in the RSmail so that to prevent from spam registration

This placeholder for IP address is for my own tracking so that I could view when the subscriber is registering from.

This also to avoid dispute as the potential customers would also need to know.

The IP address is included in all the mailing list like MailChimp. ConstantContact, etc.

So that when I send them email, it would tell them when they are signing from IP adddress, the date that they are signed up.. etct..