Thanks for confirming, I was hoping it wasn't just me ;-)

I don't know how those are related to physical (or virtual) servers.

All six of the DNS entries you mentioned resolve to the same set of three addresses: 209.197.123.153, 216.92.34.251, and 66.39.54.27 (I think Round-robin DNS is set up). Apparently perlmonks.pair.com only resolves to the first of those three. I was probably using www.perlmonks.org earlier, but I don't know which of those addresses it was resolving to.