Hacked Starcraft II Account?

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My Starcraft II account is only used by myself and my son from the same network in the same house.  Therefore I should always have the same public IP (unless my broadband provider sends me new IP address during DHCP renewal). 

So when I received this email from Blizzard about an unauthorized access to my account:

Due to suspicious activity, the Battle.net account contactme@dragonblogger.com has been locked. You logged into your account successfully at 12:57:20 on 2010-8-6 from the 175.242.12.5, but our system shows this IP isn’t your registered IP. We are concerned about whether your account has been stolen.

I became very concerned that my Starcraft II Battle.net account had been hacked, this IP address did not resolve on a reverse DNS lookup and I did a search on Arin Whois for the subnet and learned that it appeared to be a subnet owned by APNIC which clearly wasn’t my hosting provider.

OrgName:    Asia Pacific Network Information Centre 
OrgID:      APNIC
Address:    PO Box 2131
City:       Milton
StateProv:  QLD
PostalCode: 4064
Country:    AU

ReferralServer: whois://whois.apnic.net

NetRange:   175.0.0.0 - 175.255.255.255 
CIDR:       175.0.0.0/8 
NetName:    APNIC-175
NetHandle:  NET-175-0-0-0-0
Parent:     
NetType:    Allocated to APNIC
NameServer: NS1.APNIC.NET
NameServer: NS3.APNIC.NET
NameServer: NS4.APNIC.NET
NameServer: TINNIE.ARIN.NET
NameServer: NS2.LACNIC.NET
NameServer: SEC1.AUTHDNS.RIPE.NET
Comment:    
RegDate:    2009-08-03
Updated:    2010-07-30
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I followed the suggestions by Blizzard and proceeded to reset my password to something even more secure, I was concerned that my license key may have been compromised or something.  In the meantime I am going to be on the lookout to see if it happens again and if it does I will contact Blizzard to investigate the matter further.

-Justin Germino

Updated: August 7, 2010 — 8:00 am