You can't. The IRS will not tell you if someone claimed you or who claimed you. But if you should not have been claimed as someone else's dependent, you can print, sign and mail your tax return in which you "claim" yourself. The the IRS will sort it out.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
