These mode lists were gathered from the connect logs at
netsplit.de/networks/ a while back.  They may be a little out of date.

NETWORK/IRCD                    USER MODES              CHANNEL MODES
------------                    ----------              -------------
DALnet (Bahamut)                dioswkg Aabcefhnry      biklmnopstv LMrRc
IRCnet (2.10.3)                  io w   aOr             biklmnopstv aeIOqr
Undernet (ircu)                 dioswkg                 biklmnopstv
EFnet (hybrid6.2)               dioswk  Obcfnrxyz       biklmnopstv e
QuakeNet (ircu+lain)            dioswkg                 biklmnopstv
IRC-Hispano (ircu2.10.H)        dioswkg hrxX            biklmnopstv Rr
PTnet (Bahamut?)                 iowskg AabcfhOrR       biklmnopstv cdR
EnterTheGame (Bahamut)          diowskg Aabcefhnry      biklmnopstv cRr
WebChat (ConferenceRoom)         iowskg AabcEeFGghjLMmnpRrSTtXxy  biklmnopstv AacdejLMNOruz
GamesNET (ircu)                 dioswkg                 biklmnopstv
BRASnet (bras)                  dioswk  AaBbcefhjNOprRTvyz        biklmnopstv AacdeKOqRrSe
GalaxyNet (glx)                 dioswkg                 biklmnopstv
Voila (ircu)                    dioswkg                 biklmnopstv
IrCQ-Net (hybrid 6b)            diosw   bcfrknxyz       biklmnopstv ed
OpenProjectsNet (dancer-ircd)   abBcCdDeEfFgGhHiIkKlLmMnNopPrRsSUvVwWxXyYzZ0123459*@ bcdefFhiIklmnoPqstv
UniBG (hybrid6.0+UniBG)         diows   bcfknrxyz       biklmnopstv ed
HanIRC.org (ircu+hangul)        dioswkg                 biklmnopstv
NewNet (nn+wiz)                 dioswkg cflu            biklmnopstv
BrasIRC-1 (ircbr)               diowskg Aabcefhnry      biklmnopstv cRr
ChatNet (CN-BHT+MSGCHAT)        diowskg Aabcefhnry      biklmnopstv cRr
Planetarion (ircu.paIRCd)       dioswkg                 biklmnopstv
GRNet (Bahamut+)                dioswkg Aacefhnrty      biklmnopstv cLMRr
ArabChat (Bahamut+)             dioswkg AabcefhknRry    biklmnopstv cLMRr
AustNet (austhex.servd)         dioswkg achlnTtv        biklmnopstv er
LinkNet (? 3.8.7)               ?                       S?
criten.net (Bahamut)            dioswkg Aabcefhnry      biklmnopstv cLMRr
azzurra.net (Bahamut+)          diosw g Aabcefhnrxyz    biklmnopstv cRr
oz.org (ozircd)                 dioswk  f               biklmnopstv
ircgate.net (Unreal)            dioswk  AaBCceFfGgHhIjNOqrSTtvWxz  biklmnopstv AabCcefGHhiKLNOQqRrSuVz
nitro.net (Bahamut+)            diosw g Aabcefhknry     biklmnopstv cRr