go
smtp.icodia.com has one IP number , which also has a corresponding reverse pointer. gt4.icodia.com and smtp.selfsignal.fr point to the same IP. icodia.com is a domain controlled by three nameservers at icodia.com themselves. Two of them are on the same IP network. Incoming mail for icodia.com is handled by two mailservers also at icodia.com. They are on different IP networks. icodia.com has one IP number. smtp.icodia.com is hosted on a server in France.

smtp.icodia.com
a records
 
+ 83.206.153.12 83.206.0.0/16 AS3215 -
+ --- -

icodia.com
a records
 
+ 83.206.153.1 83.206.0.0/16 AS3215  
+ ---  
ns-soa records
ns.icodia.com
+ 83.206.153.40 83.206.0.0/16 AS3215 -
+ --- -
ns records
ns.icodia.com
+ 83.206.153.40 83.206.0.0/16 AS3215 -
+ --- -
ns2.icodia.com
+ 83.206.153.41 83.206.0.0/16 AS3215 -
ns3.icodia.com
+ 213.41.240.4 213.41.128.0/17 AS13193 -
mx records
mail.icodia.com
+ 83.206.153.11 83.206.0.0/16 AS3215 -
+ --- -
mailbak.icodia.com
+ 213.41.240.4 213.41.128.0/17 AS13193 ns3.icodia.com
+ --- ns3.icodia.com
ip numbers of host
83.206.153.12
ptrs of ip numbers
smtp.icodia.com
ip numbers using ptr to this host
83.206.153.12
hostnames sharing ip with a-records
gt4.icodia.com
smtp.selfsignal.fr