Did Someone Log Into my acct??

Today I had rackshack look at an open ticket on my server so they were logging into my root. When i shelled into my acct this evening i noticed the last logon was from a nameserver i did not recognize? I looked it up and found out that the owner of that name server works for rackshack since they use an email address of ez1.net. Why would i see this guys personal name server logged into my account and not that of rackshack?? Is it possible he went back into my account on his own to snoop around. Any help appreciated.

 

 

 

 

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