go
mailhost.perpar.com has one IP number , which also has a corresponding reverse pointer. mailhost.grli.net, mailhost.aedt.org, mailhost.erisa.be, dns.nickelodeon.net, mailhost.nautical.be and at least three other hosts point to the same IP. perpar.com use this as a mailserver. perpar.com is delegated to three nameservers, however one delegated nameserver is missing in the zone. All of them are on different IP networks. Incoming mail for perpar.com is handled by two mailservers at perpar.com themselves. They are on the same IP network. mailhost.perpar.com is hosted on a server in Belgium.

mailhost.perpar.com
a records
 
+ 193.121.42.53 193.121.0.0/16 AS3304 -
+ --- -

perpar.com
ns-soa records
dns.nickelodeon.net
+ 193.121.42.53 193.121.0.0/16 AS3304 mailhost.perpar.com
+ --- mailhost.perpar.com
ns records
server01.perpar.com
+ 194.78.219.38 194.78.0.0/16 AS5432 38.219-78-194.adsl-static.isp.belgacom.be
+ --- 38.219-78-194.adsl-static.isp.belgacom.be
ns4.scartech.be
+ 193.74.208.139 193.74.128.0/17 AS3304 -
+ --- -
dns.nickelodeon.net
+ 193.121.42.53 193.121.0.0/16 AS3304 mailhost.perpar.com
+ --- mailhost.perpar.com
mx records
mailhost2.perpar.com
+ 193.121.42.37 193.121.0.0/16 AS3304  
+ ---  
mailhost.perpar.com
+ 193.121.42.53 193.121.0.0/16 AS3304 -
+ --- -
ip numbers of host
193.121.42.53
ptrs of ip numbers
mailhost.perpar.com
ip numbers using ptr to this host
193.121.42.53
hostnames sharing ip with a-records
dns.nickelodeon.net
mail.nickelodeon.net
mailhost.aedt.org
mailhost.druckersociety.at
mailhost.erisa.be
mailhost.grli.net
mailhost.nautical.be
mailhost.printpower.eu
domains using this as nameserver under another name
32-27.42.121.193.in-addr.arpa
aedt.org
druckersociety.at
efmd.net
efmd.org
eregion-hub.net
erisa.be
globallyresponsibleleaders.net
grli.net
ianis.net
nautical.be
nickelodeon.net
perpar.com
printpower.eu
tonerdepresse.be
domains using this as mailserver
perpar.com
domains using this as mailserver under another name
aedt.org
druckersociety.at
erisa.be
grli.net
nautical.be
nickelodeon.net
printpower.eu
nameservers missing in zone
server01.perpar.com