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Old 09-08-2005, 09:55 PM   #4 (permalink)
oberon
Quadrature Amplitude Modulator
 
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Location: Denver
in-addr.arpa is the domain, and IPs are looked up in reverse. For an IP address such as 64.236.24.4, the DNS resolver looks up the name 4.24.236.64.in-addr.arpa to find out its reverse. IPv6 is done similarly, but with the domain ip6.arpa.
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