go
bc.cirn.net has one IP number , which also has a corresponding reverse pointer. mail.chubbyrubber.com point to the same IP. 4ph.com, cirn.net, dcbia.org, ftgcorp.com, cwdkids.com and at least 27 other hosts use this as a mailserver. cirn.net is a domain controlled by two nameservers at carpathiahost.com. They are on different IP networks. Incoming mail for cirn.net is handled by one mailserver at cirn.net themselves. cirn.net has one IP number. bc.cirn.net is hosted on a server in United States.

bc.cirn.net
a records
 
+ 66.117.32.23 66.117.32.0/20 AS29748 -
+ --- -

cirn.net
a records
 
+ 66.197.98.135 66.197.64.0/18 AS29748  
+ ---  
ns-soa records
dns1.carpathiahost.com
+ 66.117.32.40 66.117.32.0/20 AS29748 -
+ --- -
ns records
dns1.carpathiahost.com
+ 66.117.32.40 66.117.32.0/20 AS29748 -
+ --- -
dns2.carpathiahost.com
+ 206.83.192.29 206.83.192.0/24 AS26978 -
mx records
bc.cirn.net
+ 66.117.32.23 66.117.32.0/20 AS29748 -
+ --- -
ip numbers of host
66.117.32.23
ptrs of ip numbers
bc.cirn.net
ip numbers using ptr to this host
66.117.32.23
hostnames sharing ip with a-records
mail.chubbyrubber.com
domains using this as mailserver
24-7inc.net
4ph.com
asterrestaurant.com
bt-media.net
carpathiahost.net
carpathiahosting.com
carpathiahosting.net
carpydiem.com
cirn.net
cohnmarketing.com
cwdkids.com
dcbia.org
digitalpeaks.com
filtranmicro.com
firantechnology.com
fpcbonita.org
ftgcorp.com
geekspill.com
guardfox.net
hsp.carpathiahost.net
kogancompany.com
langkawiregatta.com
langkawiyachtclub.com
livingoceansfoundation.org
loriandscott.com
mathewc.com
prohosters.com
rachacha.net
rogerbutcher.com
sabeladjusters.com
schroedter.com
young-elect.com
domains using this as mailserver under another name
chubbyrubber.com