It's probably just urn queries, - queries by SHA1 hash that is put into the search field of a query packet after a leading null byte.

I would just drop them. Broadcastqueries by hash are simply too inefficient to be useful.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob