Berkeley CSUA MOTD:Entry 27105
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2025/07/08 [General] UID:1000 Activity:popular
7/8     

2003/1/15-16 [Computer/Networking] UID:27105 Activity:kinda low
1/15    What is in-addr.arpa do?  Zoen alarm says I have traffic coming from
        12.141.96.211, and nslookup says the Name is:
        211.96.141.12.in-addr.arpa.   Does the traffic really come from the
        12.* address or the 211.* address?
        \_ 12.*.  in-addr-arpa is reverse lookup, and it's configured
           from right to left.  'in' stands for 'inverse', I think.  -John
           \_ Err, are you sure it doesn't stand for internet? as in in_addr,
              etc? The fact that nslookup says the above just means there's
              no PTR records for that IP pointing to any names for it,
              in other words, no interesting reverse-lookup info.
              And yes, as John said, IP number a.b.c.d is represented
              as d.c.b.a.in-addr.arpa in DNS records. Your traffic is from
              the 12.* IP only.
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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