go
c.ns.joker.com and 66-252-21-106.ext.joker.com point to 66.252.21.106.

66-252-21-106.ext.joker.com
a records
 
+ 66.252.21.106 66.252.0.0/19 AS23522 -
+ --- -

c.ns.joker.com
a records
 
+ 66.252.21.106 66.252.0.0/19 AS23522 66-252-21-106.ext.joker.com
+ --- 66-252-21-106.ext.joker.com
ip numbers of host
66.252.21.106
ptrs of ip numbers
66-252-21-106.ext.joker.com
hostnames sharing ip with a-records
66-252-21-106.ext.joker.com
c.ns.joker.com
domains using this as nameserver
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