How to tell whether Whois privacy is enabled

If you do a look on a "Whois" record, a lot of times there is no set field inside the record that says "privacy is enabled," but after you look at enough of these you start to get a feel for it. The following table lists common privacy providers (cutouts) and the domain registrars they are associated with. Take a look at this table:

All these privacy providers are entities that are usually created by the Registrar specifically or solely to facilitate Whois privacy. One of the key reasons is to compartmentalize potential liability from domain names, where the Privacy Entity is listed as the "Registrant".