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partner.bluehost.com has one IP number , which also has a corresponding reverse pointer. bluehost.com is a domain controlled by two nameservers at bluehost.com themselves. They are on different IP networks. Incoming mail for bluehost.com is handled by four mailservers. All of them are on the same IP network. bluehost.com has one IP number. partner.bluehost.com is hosted on a server in United States.

partner.bluehost.com
a records
 
+ 74.220.195.51 74.220.192.0/19 AS11798 -
+ --- -

bluehost.com
a records
 
+ 74.220.195.50 74.220.192.0/19 AS11798  
+ ---  
ns-soa records
ns1.bluehost.com
+ 74.220.195.31 74.220.192.0/19 AS11798 -
+ --- -
ns records
ns1.bluehost.com
+ 74.220.195.31 74.220.192.0/19 AS11798 -
+ --- -
ns2.bluehost.com
+ 69.89.16.4 69.89.16.0/20 AS11798 -
mx records
bluehost.com.s7a1.psmtp.com
+ 64.18.6.14 64.18.6.0/24 AS26910 s7a1.psmtp.com
+ --- s7a1.psmtp.com
bluehost.com.s7a2.psmtp.com
+ 64.18.6.13 64.18.6.0/24 AS26910 s7a2.psmtp.com
+ --- s7a2.psmtp.com
bluehost.com.s7b1.psmtp.com
+ 64.18.6.11 64.18.6.0/24 AS26910 s7b1.psmtp.com
+ --- s7b1.psmtp.com
bluehost.com.s7b2.psmtp.com
+ 64.18.6.10 64.18.6.0/24 AS26910 s7b2.psmtp.com
+ --- s7b2.psmtp.com
ip numbers of host
74.220.195.51
ptrs of ip numbers
partner.bluehost.com
ip numbers using ptr to this host
74.220.195.51