I've been there before, lol. Another random person giving me a link to it. If it is real, they're gonna have a hard time contacting the 1000's of people visiting it to see what it is.
http://oti.cz is a domain hosting site as you might of have realized.
However that's cool. The site's owned by Ronny Lawson who resides in the white house.
contact: ZONER-2008717010
org: Ronny Lawson
name: Ronny Lawson
address: 1600 Pennsylvania Avenue NW
address: Washington
address: 20500
address: US
phone: +1.9715338273
e-mail: ronnylawson@gmail.com
registrar: REG-ZONER
created: 17.07.2008 00:10:32
... which ofcourse is a joke
Though every site you visit has data about you.
The site displaying your IP address... simple: