These are all mine: (there are more too, actually, which I can't find. I can't remember my contributions before November 2011. )

103.5.191.26

Dimension10

203.118.320.188

203.188.320.231

219.90.100.143

Psi Epsilon

TridentDonkey

219.90.100.97

Out of these, some are ||mine||, some are hackers. Everything related to Mathematics/Physics is mine. The rest are hackers'. Most are hackers':

http://en.wikipedia.org/wiki/Special:Contributions/220.255.2.70

http://en.wikipedia.org/wiki/Special:Contributions/137.132.250.11

http://en.wikipedia.org/wiki/Special:Contributions/220.255.2.130

http://en.wikipedia.org/wiki/Special:Contributions/220.255.2.115(almost all of these are hackers)