I don't know about an "official" list, but the PEERS database
available at LISTSERV backbone sites would probably be
pretty close.  The LDBASE-ette:
 
S * IN PEERS
INDEX NODE.8
 
--  co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
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