go
smtp2.aerlingus.ie has one IP number , but the reverse is smtp.aerlingus.ie. aerlingus.ie, aerlingus.com, flyaerlingus.com and aerlingushotels.com use this as a mailserver. aerlingus.ie is a domain controlled by three nameservers. Two of them are on the same IP network. Incoming mail for aerlingus.ie is handled by two mailservers at aerlingus.ie themselves. They are on the same IP network. aerlingus.ie has one IP number. smtp2.aerlingus.ie is hosted on a server in Ireland.

smtp2.aerlingus.ie
a records
 
+ 194.125.67.162 194.125.0.0/17 AS2110 smtp.aerlingus.ie
+ --- smtp.aerlingus.ie

aerlingus.ie
a records
 
+ 193.95.152.17 193.95.128.0/18 AS2110  
+ ---  
ns-soa records
obedns1.aerlingus.com
+ 193.95.152.4 193.95.128.0/18 AS2110 -
+ --- -
ns records
sec01.ns.esat.net
+ 192.111.39.111 192.111.39.0/24 AS2110 -
+ --- -
obedns1.aerlingus.com
+ 193.95.152.4 193.95.128.0/18 AS2110 -
obedns2.aerlingus.com
+ 193.95.152.5 193.95.128.0/18 AS2110 -
mx records
smtp1.aerlingus.ie
+ 194.125.67.165 194.125.0.0/17 AS2110 smtp.aerlingus.ie
+ --- smtp.aerlingus.ie
smtp2.aerlingus.ie
+ 194.125.67.162 194.125.0.0/17 AS2110 smtp.aerlingus.ie
ip numbers of host
194.125.67.162
ptrs of ip numbers
smtp.aerlingus.ie
domains using this as mailserver
aerlingus.com
aerlingus.ie
aerlingushotels.com
flyaerlingus.com