Universal has gone through a few changes over the years:
Earliest I know of is bmgmusicsearch.com from approx 2002 (Koka, Match Music, Atmosphere and Killer Tracks)
This changed to bmgzomba.com in April 2006 merging with Zomba, taking away some labels from Playmusiconline.com such as FirstCom, Hollywood, Hollywood Film, Chappell to name a few
BMG Zomba was then bought out by Universal and the site change in August 2007 to unippm.com
Sometime a few years back they changed the domain to its current one universalproductionmusic.com
If you want to see what other libraries Universal represented then I would recommend checking the archive out of unippm.eu/librarys/index.asp?action=browse