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Yea, apparently in January Verisign changed their long standing policy of allowing only one name server to be registered per IP Address. To confuse matters even more, I don't think all of the registrars support this, and I have not seen anything official from ICANN (not that anyone cares what ICANN thinks).
I'm not certain that this is entirely accurate. Certainly, ns0.ja.net has had two IP addresses for as long as I can remember (at least for the last five years...) and has been happily reflected in the whois and .net zone.
The policy change mentioned would mean that ns0.ja.net and ns3.ja.net could be the same IP Address, which had previously not been allowed. Can't speak for other registars, but opensrs will now let you register multiple NS's on an IP. Regards, Matt -- Matt Levine @Home: matt@deliver3.com @Work: matt@eldosales.com ICQ : 17080004 AIM : exile PGP : http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0D04CF "The Trouble with doing anything right the first time is that nobody appreciates how difficult it was." -BIX