Yeah you got it right. You'll need a non U.S. IP address to register your ethereum address on eos.io. However if you are familiar with the command line, there is a tool you could use to register with. The details can be found on the EOS website. Cheers.
RE: So you purchased EOS on an exchange ? Why you need to register your Ethereum Wallet address at EOS.IO, prior to the 1 June 2018 !