The general guidance for networking has been to only use IPs and domains that you actually control... But even 5-8 years ago, the last time I personally touched

The general guidance for networking has been to only use IPs and domains that you actually control... But even 5-8 years ago, the last time I personally touched a cisco WLC box, it still had 1.1.1.1 hardcoded. Cisco loves to break their own rules...