diff --git a/plugins/AutoMode/plugin.py b/plugins/AutoMode/plugin.py
index 738aae428..a3e8db67c 100644
--- a/plugins/AutoMode/plugin.py
+++ b/plugins/AutoMode/plugin.py
@@ -163,7 +163,8 @@ class AutoMode(callbacks.Plugin):
                         # We're not in the channel anymore.
                         pass
                 schedule.addEvent(unban, time.time()+period)
-            banmask =conf.supybot.protocols.irc.banmask.makeBanmask(msg.prefix)
+            banmask = conf.supybot.protocols.irc.banmask.makeExtBanmask(
+                msg.prefix, channel=channel, network=irc.network)
             irc.queueMsg(ircmsgs.ban(channel, banmask))
             irc.queueMsg(ircmsgs.kick(channel, msg.nick))
 
diff --git a/plugins/Channel/plugin.py b/plugins/Channel/plugin.py
index e6d24fcae..815a1ef18 100644
--- a/plugins/Channel/plugin.py
+++ b/plugins/Channel/plugin.py
@@ -368,7 +368,9 @@ class Channel(callbacks.Plugin):
             try:
                 bannedHostmask = irc.state.nickToHostmask(target)
                 banmaskstyle = conf.supybot.protocols.irc.banmask
-                banmask = banmaskstyle.makeBanmask(bannedHostmask, [o[0] for o in optlist])
+                banmask = banmaskstyle.makeExtBanmask(
+                    bannedHostmask, [o[0] for o in optlist],
+                    channel=channel, network=irc.network)
             except KeyError:
                 if not conf.supybot.protocols.irc.strictRfc() and \
                         target.startswith('$'):
@@ -606,7 +608,9 @@ class Channel(callbacks.Plugin):
             c.addBan(banmask, expires)
             ircdb.channels.setChannel(channel, c)
             irc.replySuccess()
-        add = wrap(add, ['op', first('hostmask', 'banmask'), additional('expiry', 0)])
+        add = wrap(add, ['op',
+                         first('hostmask', 'extbanmask'),
+                         additional('expiry', 0)])
 
         @internationalizeDocstring
         def remove(self, irc, msg, args, channel, banmask):
diff --git a/plugins/Channel/test.py b/plugins/Channel/test.py
index f091cae88..35b71c3c8 100644
--- a/plugins/Channel/test.py
+++ b/plugins/Channel/test.py
@@ -273,14 +273,24 @@ class ChannelTestCase(ChannelPluginTestCase):
                 self.channel, prefix='foobar!user@host.domain.tld'))
         join()
         self.irc.feedMsg(ircmsgs.op(self.channel, self.irc.nick))
-        self.assertKban('kban --account --exact foobar',
-                        '~a:account1')
-        join()
-        self.assertKban('kban --account foobar',
-                        '~a:account1')
-        join()
-        self.assertKban('kban --account --host foobar',
-                        '~a:account1')
+
+
+        for style in (['exact'], ['account', 'exact']):
+            with conf.supybot.protocols.irc.banmask.context(style):
+                self.assertKban('kban --account --exact foobar',
+                                '~a:account1')
+                join()
+                self.assertKban('kban --account foobar',
+                                '~a:account1')
+                join()
+                self.assertKban('kban --account --host foobar',
+                                '~a:account1')
+                join()
+
+        with conf.supybot.protocols.irc.banmask.context(['account', 'exact']):
+            self.assertKban('kban foobar',
+                            '~a:account1')
+            join()
 
     def testBan(self):
         with conf.supybot.protocols.irc.banmask.context(['exact']):
diff --git a/src/commands.py b/src/commands.py
index f93e7ce47..2874c4692 100644
--- a/src/commands.py
+++ b/src/commands.py
@@ -435,7 +435,14 @@ def getBanmask(irc, msg, args, state):
     getChannel(irc, msg, args, state)
     banmaskstyle = conf.supybot.protocols.irc.banmask
     state.args[-1] = banmaskstyle.makeBanmask(state.args[-1],
-            channel=state.channel)
+            channel=state.channel, network=irc.network)
+
+def getExtBanmask(irc, msg, args, state):
+    getHostmask(irc, msg, args, state)
+    getChannel(irc, msg, args, state)
+    banmaskstyle = conf.supybot.protocols.irc.extbanmask
+    state.args[-1] = banmaskstyle.makeExtBanmask(state.args[-1],
+            channel=state.channel, network=irc.network)
 
 def getUser(irc, msg, args, state):
     try:
@@ -806,6 +813,7 @@ wrappers = ircutils.IrcDict({
     'commandName': getCommandName,
     'email': getEmail,
     'expiry': getExpiry,
+    'extbanmask': getExtBanmask,
     'filename': getSomething, # XXX Check for validity.
     'float': getFloat,
     'glob': getGlob,
diff --git a/src/conf.py b/src/conf.py
index 2848d817d..975852c34 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -1181,7 +1181,7 @@ registerGroup(supybot.protocols, 'irc')
 
 class Banmask(registry.SpaceSeparatedSetOfStrings):
     __slots__ = ('__parent', '__dict__') # __dict__ is needed to set __doc__
-    validStrings = ('exact', 'nick', 'user', 'host')
+    validStrings = ('exact', 'nick', 'user', 'host', 'account')
     def __init__(self, *args, **kwargs):
         assert self.validStrings, 'There must be some valid strings.  ' \
                                   'This is a bug.'
@@ -1215,6 +1215,31 @@ class Banmask(registry.SpaceSeparatedSetOfStrings):
         isn't specified via options, the value of
         conf.supybot.protocols.irc.banmask is used.
 
+        Unlike :meth:`makeExtBanmask`, this is guaranteed to return an
+        RFC1459-like mask, suitable for ircdb's ignore lists.
+
+        options - A list specifying which parts of the hostmask should
+        explicitly be matched: nick, user, host.  If 'exact' is given, then
+        only the exact hostmask will be used.
+        """
+        if not network:
+            network = dynamic.irc.network
+        if not options:
+            options = supybot.protocols.irc.banmask.getSpecific(
+                network, channel)()
+        options = [option for option in options if option != 'account']
+        return self.makeExtBanmask(hostmask, options, channel, network=network)
+
+    def makeExtBanmask(self, hostmask, options=None, channel=None, *, network):
+        """Create a banmask from the given hostmask.  If a style of banmask
+        isn't specified via options, the value of
+        conf.supybot.protocols.irc.banmask is used.
+
+        Depending on the options and configuration, this may return a mask
+        in the format of an extban (eg. "~account:foobar" on UnrealIRCd).
+        If this is unwanted (eg. to pass to ircdb's ignore lists, use
+        :meth:`makeBanmask` instead)
+
         options - A list specifying which parts of the hostmask should
         explicitly be matched: nick, user, host.  If 'exact' is given, then
         only the exact hostmask will be used.
@@ -1224,8 +1249,6 @@ class Banmask(registry.SpaceSeparatedSetOfStrings):
         """
         if not channel:
             channel = dynamic.channel
-        if not network:
-            network = dynamic.irc.network
         (nick, user, host) = ircutils.splitHostmask(hostmask)
         bnick = '*'
         buser = '*'