User blog comment:ShadowEyes978/Why Vandalize???/@comment-26531060-20120707125655/@comment-9548103-20120708181129

Either of 2 ways:

1. They swap computers (as most computers have one-of-a-kind IP's.)

2. They change internet providers. This instance happens in the US a lot, where I might have 212.314.63 (Not a real IP) to 96.145.62 (Again, not a real IP)