Forum Moderators: phranque
You need a Whois tool.
There is a site you can use for this: [networksolutions.com ]. I have found it to be pretty effective, even across multiple registrars.
The only issue is that there are dozens of different registrars out there, and you may not get completely authoritative information unless you use their Whois.
There is a command line Whois for Windows, and the Mac allows both command line and GUI tool (Network Utility).
This is a good forum, but zone file editing is a big topic, and very dangerous. All kinds of strange bugs and undesirable consequences can come from doing it wrong.
I have done it, and made bad mistakes, so I don't do my own zone files any more. You do not want my advice here.