IAM Plex Classic https://www.plexonline.com/signon/
Plex Classic https://www.plexonline.com
IAM Plex Classic Test https://test.plexonline.com/signon/
Plex Classic Test https://test.plexonline.com/
IAM Plex UX https://cloud.plex.com/sso/
Plex UX https://cloud.plex.com/
IAM Plex Mobile https://mobile.plexonline.com/signon/
Plex Mobile https://mobile.plexonline.com/
IAM Plex Mobile Test https://testmobile.plexonline.com/signon/
Plex Mobile Test https://testmobile.plexonline.com/
Custom URL
https://{Plex company code}.on.plex.com
Misc
Status Page https://status.plex.com
TLS Connectivity test https://connectivitytest.plex.com