Here's a few, and yes it's no problem to have them in your hostcahe list :

gnotella.fileflash.com:6346
connect1.gnutellanet.com:6346
router.limewire.com:6346, provided by LimeWire
public.bearshare.net:6346, provided by FreePeers
connect2.gnutellanet.com:6346
connect3.gnutellanet.com:6346
connect4.gnutellanet.com:6346
gnet2.ath.cx:6346
gnutella-again.hostscache.com:6346
gnutella.hostscache.com:6346 (may be down)

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