From the KDE included with Red Hat Linux 6.1:

 > lsof | sed -n '1,1p;/53001/p'
COMMAND     PID    USER   FD   TYPE     DEVICE     SIZE       NODE NAME
kdm         857    root    5u  IPv4        949                 TCP *:53001 
(LISTEN)
XF86_SVGA   868    root    5u  IPv4        949                 TCP *:53001 
(LISTEN)
startkde    915 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
autorun     919 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
kdm        6192    root    5u  IPv4        949                 TCP *:53001 
(LISTEN)
kwm        6209 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
kbgndwm    6240 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
kfm        6266 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
krootwm    6267 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
kpanel     6269 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
kpm        6275 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)
ktop       6276 gleason    5u  IPv4        949                 TCP *:53001 
(LISTEN)