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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 firstname.lastname@example.org has been locked. You logged into your account successfully at 12:57:20 on 2010-8-6 from the 220.127.116.11, 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: 18.104.22.168 - 22.214.171.124 CIDR: 126.96.36.199/8 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
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.