Thank you for contacting us. The 192.168.0.0 range is private; 192.81.128.60 is a fully functional public IP address. If some software is parsing 192.81.128.60 as a non-routable IP, that would be a bug with that software and you'll want to reach out to the developers of it to resolve that issue.
Let us know if there's anything else we can do to assist you!