go
rtt.fr.colt.net has one IP number , which also has a corresponding reverse pointer. fr.colt.net is a domain controlled by two nameservers at coltfrance.com. They are on different IP networks. Incoming mail for fr.colt.net is handled by two mailservers having a total of three IP numbers. Two of them are on the same IP network. rtt.fr.colt.net is hosted on a server in France.

rtt.fr.colt.net
a records
 
+ 62.23.0.121 62.23.0.0/16 AS8220 -
+ --- -

fr.colt.net
ns-soa records
ns0.coltfrance.com
+ 84.14.241.56 84.14.0.0/16 AS8220 -
+ --- -
ns records
ns0.coltfrance.com
+ 84.14.241.56 84.14.0.0/16 AS8220 -
+ --- -
ns1.coltfrance.com
+ 212.74.78.59 212.74.78.0/24 AS8220 -
mx records
mx.coltfrance.com
+ 213.41.78.23 213.41.0.0/17 AS8220 mx0.fr.colt.net
+ --- mx0.fr.colt.net
+ 213.41.78.24 213.41.0.0/17 AS8220 mx1.fr.colt.net
+ --- mx1.fr.colt.net
dialup-mx.coltfrance.com
+ 195.68.86.12 195.68.0.0/17 AS8220 -
+ --- -
IP numbers of host
62.23.0.121
PTRs of IP numbers
rtt.fr.colt.net
IP numbers using PTR to this host
62.23.0.121