HELPOP

irc.mibbit.com uses ureal, here some commands (see also /help, /ns help, /cs help, /bs help, /ms help):

/HELPOP

/HELPOP USERCMDS - To get the list of User Commands

Currently the following User commands are available:

ADMIN
AWAY
CREDITS
CYCLE
DALINFO
DCCALLOW
INVITE
ISON
JOIN
KICK
KNOCK
LICENSE
LINKS
LIST
LUSERS
MAP
MODE
MODULE
MOTD
NAMES
NICK
NOTICE
PART
PING
PONG
PRIVMSG
QUIT
RULES
SETNAME
SILENCE
STATS
TIME
TOPIC
USERHOST
USERIP
VERSION
VHOST
WATCH
WHO
WHOIS
WHOWAS

/HELPOP OPERCMDS - To get the list of Oper Commands

This section gives the IRC Operator only commands.

ADCHAT
ADDMOTD
ADDOMOTD
CHATOPS
CHGHOST
CHGIDENT
CHGNAME
CLOSE
CONNECT
DCCDENY
DIE
DNS
GLINE
GLOBOPS
GZLINE
HTM
KILL
KLINE
LAG
LOCOPS
MKPASSWD
MODULE
NACHAT
OPER
OPERMOTD
REHASH
RESTART
RPING
SAJOIN
SAMODE
SAPART
SDESC
SETHOST
SETIDENT
SHUN
SPAMFILTER
SQUIT
TEMPSHUN
TRACE
TSCTL
UNDCCDENY
WALLOPS
ZLINE

/HELPOP SVSCMDS - Commands sent via U:Lined Server (Services)

This section gives the commands that can be sent via a U:Lined Server such as Services. The command is typically sent as:

/MSG OPERSERV RAW :services <command>

SQLINE
SVS2MODE
SVS2SNO
SVSFLINE
SVSJOIN
SVSKILL
SVSLUSERS
SVSMODE
SVSMOTD
SVSNICK
SVSNLINE
SVSNOLAG
SVSNOOP
SVSO
SVSPART
SVSSILENCE
SVSSNO
SVSWATCH
SWHOIS
UNSQLINE

/HELPOP UMODES - To get the list of User Modes

Here is a list of all the usermodes which are available for use.

a = Is a Services Administrator
d = Makes it so you can not receive channel PRIVMSGs (Deaf)
g = Can read & send to GlobOps, and LocOps
h = Available for Help (Help Operator)
i = Invisible (Not shown in /WHO searches)
o = Global IRC Operator
p = Hide all channels in /whois and /who
q = Only U:lines can kick you (Services Admins/Net Admins only)
r = Identifies the nick as being Registered (settable by services only)
s = Can listen to Server notices
t = Says that you are using a /VHOST
v = Receive infected DCC send rejection notices
w = Can listen to Wallop messages
x = Gives the user Hidden Hostname (security)
z = Marks the client as being on a Secure Connection (SSL)

A = Is a Server   Administrator
B = Marks you as being a Bot
C = Is a Co       Administrator
G = Filters out all Bad words in your messages with <censored>
H = Hide IRCop status in /WHO and /WHOIS. (IRC Operators only)
N = Is a Network  Administrator
O = Local  IRC Operator
R = Allows you to only receive PRIVMSGs/NOTICEs from registered (+r) users
S = For Services only. (Protects them)
T = Prevents you from receiving CTCPs
V = Marks the client as a WebTV user
W = Lets you see when people do a /WHOIS on you (IRC Operators only)

/HELPOP SNOMASKS - To get a list of Snomasks

Snomask stands for 'Service NOtice MASK', it (mainly) controls which server notices you will receive.

Usage: /MODE nick +s <snomask>
Ex: /MODE blah +s +cF-j
The parameter specifies which snomasks you want (or don't want).
You can also remove all snomasks by simply doing /MODE nick -s.
Below is a list of possible snomasks:

c = View connects/disconnects on local server
e = View 'Eyes' server messages (OperOverride, /CHG* and /SET* usage, ..)
f = View flood alerts
j = View Junk notices (not recommended for normal use)
k = View KILL notices
n = View nick changes on local server
o = View oper-up notices
q = View rejected nick changes due to Q:lines
s = View general notices
v = View usage of /VHOST command

F = View connects/disconnects on remote servers (except U-lines)
G = View TKL notices (Gline, GZline, Shun, etc)
N = View nick changes on remote servers
S = View spamfilter matches

/HELPOP CHMODES - To get the list of Channel Modes

This section lists all of the possible channel modes that may be used with /MODE

a <nickname> = Gives Channel Admin to the user
b <nick!ident@host> = Bans the nick!ident@host from the channel [h]
c = Block messages containing mIRC color codes [o]
e <nick!ident@host> = Overrides a ban for matching users [h]
f <floodparams> = Flood protection (for more info see /HELPOP CHMODEF) [o]
h <nickname> = Gives HalfOp status to the user (Limited op access)
I <nick!ident@host> = Overrides +i for matching users [h]
i = A user must be invited to join the channel [h]
j <joins:sec> = Throttle joins per-user to 'joins' per 'sec' seconds [o]
k <key> = Users must specify <key> to join [h]
l <number of max users> = Channel may hold at most <number> of users [o]
m = Moderated channel (only +vhoaq users may speak) [h]
n = Users outside the channel can not send PRIVMSGs to the channel [h]
o <nickname> = Gives Operator status to the user
p = Private channel [o]
q <nickname> = Gives Owner status to the user
r = The channel is registered (settable by services only)
s = Secret channel [o]
t = Only +hoaq may change the topic [h]
u = Auditorium mode (/names and /who #channel only show channel ops) [q]
v <nickname> = Gives Voice to the user (May talk if chan is +m)
z = Only Clients on a Secure Connection (SSL) can join [o]

A = Server/Net Admin only channel (settable by Admins)
C = No CTCPs allowed in the channel [o]
G = Filters out all Bad words in messages with <censored> [o]
K = /KNOCK is not allowed [o]
L <chan2> = Channel link (If +l is full, the next user will auto-join <chan2>) [q]
M = Must be using a registered nick (+r), or have voice access to talk [o]
N = No Nickname changes are permitted in the channel [o]
O = IRC Operator only channel (settable by IRCops)
Q = No kicks allowed [o]
R = Only registered (+r) users may join the channel [o]
S = Strips mIRC color codes [o]
T = No NOTICEs allowed in the channel [o]
V = /INVITE is not allowed [o]

[h] requires at least halfop, [o] requires at least chanop, [q] requires owner

/HELPOP EXTBANS

Extended bantypes:

Type| Name        | Explanation
-----------------------------------------------------------------------------------
    |             | People matching these bans can join but are unable to
~q  | Quiet       | speak, unless they have +v or higher.
    |             | Example:
    |             | +bb ~q:*!*@blah.blah.com ~q:mib_*!*@* or /mode +b ~q:mib_*!*@*
-----------------------------------------------------------------------------------
    |             | People matching these bans cannot change nicks, unless
~n  | nickchange  | they have +v or higher.
    |             | Example:
    |             | +bb ~n:*!*@*.aol.com ~n:nick*!*@*
-----------------------------------------------------------------------------------
    |             | If the user is in this channel then (s)he is unable to
    | [prefix]    | join. A prefix can also be specified (+/%/@/&/~) which
~c  | channel     | means that it will only match if the user has that
    |             | rights or higher on the specified channel.
    |             | Example: +b ~c:#lamers, +e ~c:@#trusted
-----------------------------------------------------------------------------------
    |             | If the realname of a user matches this then (s)he is
    |             | unable to join.
~r  | realname    | Example: +b ~r:*Stupid_bot_script*
    |             | NOTE: an underscore ('_') matches both a space (' ') and
    |             | an underscore ('_'), so this ban would
    |             | match 'Stupid bot script v1.4'.
------------------------------------------------------------------------------

/HELPOP OFLAGS - To see the list of O:line Flags

Here you will find the flags that can be placed inside of the O:Lines

a (services-admin) Gets +a on oper up. Is Services Administrator
b (can_kline) Oper can /KLINE users from server
c (can_localroute) Access to do local /SQUITs and /CONNECTs
d (can_dccdeny) Can use /DCCDENY
g (can_globops) Oper can send /GLOBOPS
h (helpop) Oper receives umode +h (helpop)
k (can_localkill) Access to do local /KILLs
n (can_localnotice) Oper can send Local Server Notices
o (locop) Local Operator
q (can_setq) Can use +q
r (can_rehash) Access to /REHASH server
t (can_gkline) Can use /GLINE, /SHUN and /SPAMFILTER
v (can_override) Can use OperOverride
w (can_wallops) Oper can send /WALLOPS
Z (can_gzline) Can add global Z:Lines
z (can_zline) Can add Z:Lines

A (admin) Gets +A on oper up. Is Server Administrator
B (can_unkline) Oper can remove Klines
C (coadmin) Gets +C on oper up. Is Co Administrator
D (can_die) Access to /DIE server
G (can_globalnotice) Oper can send Global Server Notices
H (get_host) Gets +x on oper up
K (can_globalkill) Access to do global /KILLs
L (can_globalroute) Access to do global /SQUITs and /CONNECTs
N (netadmin) Gets +N on oper up. Is Network Administrator
O (globop) Global Operator
R (can_restart) Access to /RESTART server
W (get_umodew) Gets +W on oper up
X (can_addline) Can use /ADDLINE

this is just a stub, feel free to improve it