EOB - supports end of burst notification (EOB token)
KLN - supports remote KLINE
UNKLN - supports remote UNKLINE
+GLN - supports hybrid7-style GLINE (:oper GLINE user host :reason)
HOPS - supports halfops (+h -- %<nick>)
HUB - denotes that the target server is a HUB
AOPS - supports anonymous ops (+a, op hiding/op status hiding)