If you are unsure what that address was, go to https://current_sps_address:8649/api/authenticate. This should cause the browser to throw an untrusted SSL certificate warning. At that point view the SSL certificate in the browser. To see the original IP address, look at the Subject Alternative Name in the certificate.
An example from Chrome below:
:
© ALL RIGHTS RESERVED. Feedback Conditions d’utilisation Confidentialité Cookie Preference Center