That there is no pointer (PTR) record for that IP address contained in the
nameserver(s), PTR records show reverse DNS (rDNS). Here is the 'dig' as per
SamSpade on deja.com. Notice that the PTR record is the reverse of the Address
(A) record - one if for reverse DNS, the other for forward DNS.
Recursive queries supported by this server
Query for 240.192.10.208.in-addr.arpa type=255 class=1
240.192.10.208.in-addr.arpa PTR (Pointer) x40.deja.com
240.192.10.208.in-addr.arpa PTR (Pointer) www.deja.com
240.192.10.208.in-addr.arpa PTR (Pointer) deja.com
192.10.208.in-addr.arpa NS (Nameserver) odns1.dejanews.com
192.10.208.in-addr.arpa NS (Nameserver) odns2.dejanews.com
192.10.208.in-addr.arpa NS (Nameserver) ns.dejanews.com
odns1.dejanews.com A (Address) 184.108.40.206
odns2.dejanews.com A (Address) 220.127.116.11
ns.dejanews.com A (Address) 18.104.22.168
Looks also like three nameservers were queried in your case, and as you can see
deja has also three nameservers set up for queries. A domain must have at least
two, primary and secondary.
The next step would probably be to get the IP block owner. HTH.
>What does the below message mean when performing a trace of an IP address?
>- NSLOOKUP QUERY RESULTS --
>*** First PTR Name Server Lookup unsuccessful.
>*** Second PTR Name Server Lookup unsuccessful.
>*** All Three Name Server Lookup attempts were unsuccessful.
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