GWCs (Gnutella Web Caches) get their IPs by Hubs that promote themselves when going into Hub mode.
UDP hostcaches are an active part of the network and connect to it as client/Hub (AFAIK) to maintain its list.
In both cases, the list has a defined length and each time a new Hub has been added, the oldest one is removed.
Does this answer your question?
mfg,
Old
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