go
mx1.it4web.ro has one IP number , but the reverse is deltarom-fo.b.astral.ro. mx1.osi7.ro point to the same IP. it4web.ro use this as a mailserver. it4web.ro is a domain controlled by two nameservers at it4web.ro themselves. They are on different IP networks. Incoming mail for it4web.ro is handled by two mailservers also at it4web.ro. They are on different IP networks. it4web.ro has one IP number. mx1.it4web.ro is hosted on a server in Romania.

mx1.it4web.ro
a records
 
+ 85.186.159.160 85.186.0.0/16 AS6746 deltarom-fo.b.astral.ro
+ --- deltarom-fo.b.astral.ro

it4web.ro
a records
 
+ 81.180.160.6 81.180.160.0/20 AS30976  
+ ---  
ns-soa records
ns1.it4web.ro
+ 81.180.160.2 81.180.160.0/20 AS30976 netfinity.it4web.ro
+ --- netfinity.it4web.ro
+ --- -
ns records
ns1.it4web.ro
+ 81.180.160.2 81.180.160.0/20 AS30976 netfinity.it4web.ro
+ --- netfinity.it4web.ro
+ --- -
ns2.it4web.ro
+ 80.97.64.41 80.97.64.0/20 AS6746 it4web.cluj.astral.ro
+ --- it4web.cluj.astral.ro
mx records
mx1.it4web.ro
+ 85.186.159.160 85.186.0.0/16 AS6746 deltarom-fo.b.astral.ro
+ --- deltarom-fo.b.astral.ro
mx2.it4web.ro
+ 81.180.160.33 81.180.160.0/20 AS30976 dg-cm70.dgis.ro
+ --- dg-cm70.dgis.ro
+ --- dgis-cj.dgis.ro
ip numbers of host
85.186.159.160
ptrs of ip numbers
deltarom-fo.b.astral.ro
hostnames sharing ip with a-records
mx1.osi7.ro
domains using this as mailserver
it4web.ro
domains using this as mailserver under another name
osi7.ro