In addition to the previous advice, I could also recommend Bassoe; https://www.bassoe.no/#/
Generally, the time and cost elements associated with updating these databases are huge, and exhibiting information for free in the public domain needs to be subsidised by offering other pay to subscribe services. Often you'll find Researchers with limited technical knowledge being responsible for updating technical content, which doesn't always work. Comparing information between websites such as Bassoe and Infield soon illustrates discrepancies, so it's very much a case of 'user beware'.
Once rigs are retired, other than brokers trading the scrap value, there is no longer any commercial interest, and for this libraries or archives in academic or commercial institutions are your only option.
A few companies (e.g. Wood Mackenzie/Infield) ) do also compile technical information on a pay-to-subscribe basis aimed mainly at commercial use for larger organisations. The free element is not as accurate as it could be, and not always kept up to date.
Tracking AIS or GPS information is a dimension that a few companies use, (e.g. vesseltracker.com and flightradar24.com). These services are increasingly popular in the form of mobile apps.
Unquestionably, the most accurate source of information is via the fleet status reports published by the Drilling Contractors or Fleet Managers. Obtaining this data is, however, a time-consuming process made all the more difficult if you are new to a basin or region and have little knowledge of the rigs available in that part of the world. If you use the databases such as Bassoe or Infield to get your initial data, you can then update it or check for accuracy via this route.
I hope this helps,