The Internet country code domain .yu for the former Yugoslavia became obsolete Tuesday after 21 years, the Serbian National Register for Internet Domain Names said.
The RNIDS said on its website about 4,000 .yu domains were shut down Tuesday and most of them adopted the Serbian domain .rs which has been in use since March 10, 2008.
Belgrade's national museum for Serbian history marked the event with a ceremony, with visitors able to get a glimpse of the first computer produced in Serbia, one of the successor states to the former Yugoslavia.
A documentary shown also highlighted the role of Serbian hackers.
The .yu domain, attributed in 1989, was one of the last relics of Yugoslavia which fell apart when its constituent republics declared independence from Belgrade in the 1990s triggering a series of wars.
The now independent former Yugoslav republics and Kosovo have now their own country code domains.
Explore further: Briefs: ICANN Internet conference opens in N.Z.