go
aj1.com point to 204.10.97.20.

aj1.com
a records
 
+ 204.10.97.20 204.10.96.0/21 AS19942 20-1-97-11.ajprod.losangeles1.contentcolo.net
+ --- 20-1-97-11.ajprod.losangeles1.contentcolo.net

20-1-97-11.ajprod.losangeles1.contentcolo.net
ptr records
 
+ 204.10.97.20 204.10.96.0/21 AS19942 -
+ --- -
ip numbers of host
204.10.97.20
ptrs of ip numbers
20-1-97-11.ajprod.losangeles1.contentcolo.net
hostnames sharing ip with a-records
aj1.com