June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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domaintools
Originally founded by Jay Westerdahl under the name whois.sc, domaintools is, if not the only, then certainly the most comprehensive, historical archive of whois records in the world.
Using this site (premium membership required), you can examine historical iterations of whois records, as well as the changes to a domain's IP address and nameserver delegations over time.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.