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mta-v1.mail.vip.ac4.yahoo.com has one IP number , which also has a corresponding reverse pointer. a.mx.mail.yahoo.com point to the same IP. mta-v1.mail.vip.ac4.yahoo.com is hosted on a server in United States.

mta-v1.mail.vip.ac4.yahoo.com
a records
 
+ 67.195.168.31 67.195.160.0/19 AS14778 -
+ --- -
ip numbers of host
67.195.168.31
ptrs of ip numbers
mta-v1.mail.vip.ac4.yahoo.com
ip numbers using ptr to this host
67.195.168.31
hostnames sharing ip with a-records
a.mx.mail.yahoo.com
domains using this as mailserver under another name
crossroad.com
geocities.com
myfunnymail.com
newenglandteluguacademy.com
rocketmail.com
y7mail.com
yahoo.ca
yahoo.cl
yahoo.co.nz
yahoo.com
yahoo.com.ar
yahoo.com.au
yahoo.com.br
yahoo.com.co
yahoo.com.mx
yahoo.com.tr
yahoo.com.ve
yahoo.de
yahoo.es
yahoo.fr
yahoo.it
yahoo.ro
ymail.com
nameservers missing in parent delegation
ns6.yahoo.com
ns8.yahoo.com