go
g.ext.nic.fr has one IP number , which also has a corresponding reverse pointer. wf, tf, fr, yt, re and at least one other host use this as a nameserver. g.ext.nic.fr is hosted on a server in United States even though the hostname implies France.

g.ext.nic.fr
a records
 
+ 204.61.216.39 204.61.216.0/23 AS42 -
+ --- -
ip numbers of host
204.61.216.39
ptrs of ip numbers
g.ext.nic.fr
ip numbers using ptr to this host
204.61.216.39
domains using this as nameserver
fr
pm
re
tf
wf
yt