diff --git a/Makefile b/Makefile
index 7f8f409..37d3726 100644
--- a/Makefile
+++ b/Makefile
@@ -90,12 +90,14 @@ SNIRCD_SELECTORS := \
 
 # testListEmpty and testListOne fails because irc2 deprecated LIST
 # testKickDefaultComment fails because it uses the nick of the kickee rather than the kicker.
+# testWallopsPrivileges fails because it ignores the command instead of replying ERR_UNKNOWNCOMMAND
 IRC2_SELECTORS := \
 	not Ergo \
 	and not deprecated \
 	and not strict \
 	and not testListEmpty and not testListOne \
 	and not testKickDefaultComment \
+	and not testWallopsPrivileges \
 	$(EXTRA_SELECTORS)
 
 MAMMON_SELECTORS := \
diff --git a/irctest/controllers/hybrid.py b/irctest/controllers/hybrid.py
index 919ce8b..6725e7d 100644
--- a/irctest/controllers/hybrid.py
+++ b/irctest/controllers/hybrid.py
@@ -63,7 +63,7 @@ operator {{
     encrypted = no;
     umodes = locops, servnotice, wallop;
     flags = admin, connect, connect:remote, die, globops, kill, kill:remote,
-            kline, module, rehash, restart, set, unkline, unxline, xline;
+            kline, module, rehash, restart, set, unkline, unxline, wallops, xline;
 }};
 """
 
diff --git a/irctest/controllers/inspircd.py b/irctest/controllers/inspircd.py
index e7d1120..9aba976 100644
--- a/irctest/controllers/inspircd.py
+++ b/irctest/controllers/inspircd.py
@@ -21,6 +21,7 @@ TEMPLATE_CONFIG = """
 
 <class
     name="ServerOperators"
+    commands="WALLOPS GLOBOPS"
     privs="channels/auspex users/auspex channels/auspex servers/auspex"
     >
 <type
diff --git a/irctest/controllers/plexus4.py b/irctest/controllers/plexus4.py
index 1037a9f..83fa78b 100644
--- a/irctest/controllers/plexus4.py
+++ b/irctest/controllers/plexus4.py
@@ -68,7 +68,7 @@ operator {{
     encrypted = no;
     umodes = locops, servnotice, wallop;
     flags = admin, connect, connect:remote, die, globops, kill, kill:remote,
-            kline, module, rehash, restart, set, unkline, unxline, xline;
+            kline, module, rehash, restart, set, unkline, unxline, wallops, xline;
 }};
 """
 
diff --git a/irctest/server_tests/wallops.py b/irctest/server_tests/wallops.py
new file mode 100644
index 0000000..2d5fb69
--- /dev/null
+++ b/irctest/server_tests/wallops.py
@@ -0,0 +1,74 @@
+from irctest import cases, runner
+from irctest.numerics import ERR_NOPRIVILEGES, ERR_UNKNOWNCOMMAND, RPL_YOUREOPER
+from irctest.patma import ANYSTR, StrRe
+
+
+class WallopsTestCase(cases.BaseServerTestCase):
+    @cases.mark_specifications("RFC2812", "Modern")
+    def testWallops(self):
+        """
+        "The WALLOPS command is used to send a message to all currently connected
+        users who have set the 'w' user mode for themselves."
+        -- https://datatracker.ietf.org/doc/html/rfc2812#section-4.7
+        -- https://github.com/ircdocs/modern-irc/pull/118
+
+        "Servers MAY echo WALLOPS messages to their sender even if they don't have
+        the 'w' user mode.
+        Servers MAY send WALLOPS only to operators."
+        -- https://github.com/ircdocs/modern-irc/pull/118
+
+        """
+        self.connectClient("nick1")
+        self.connectClient("nick2")
+        self.connectClient("nick3")
+
+        self.sendLine(2, "MODE nick2 -w")
+        self.getMessages(2)
+        self.sendLine(3, "MODE nick3 +w")
+        self.getMessages(3)
+
+        self.sendLine(1, "OPER operuser operpassword")
+        self.assertIn(
+            RPL_YOUREOPER,
+            [m.command for m in self.getMessages(1)],
+            fail_msg="OPER failed",
+        )
+
+        self.sendLine(1, "WALLOPS :hi everyone")
+
+        messages = self.getMessages(1)
+        if ERR_UNKNOWNCOMMAND in (message.command for message in messages):
+            raise runner.NotImplementedByController("WALLOPS")
+        for message in messages:
+            self.assertMessageMatch(
+                message,
+                prefix=StrRe("nick1!.*"),
+                command="WALLOPS",
+                params=[StrRe(".*hi everyone")],
+            )
+
+        messages = self.getMessages(3)
+        if messages:
+            self.assertMessageMatch(
+                messages[0],
+                prefix=StrRe("nick1!.*"),
+                command="WALLOPS",
+                params=[StrRe(".*hi everyone")],
+            )
+        self.assertEqual(
+            self.getMessages(2), [], fail_msg="Server sent WALLOPS to user without +w"
+        )
+
+    @cases.mark_specifications("Modern")
+    def testWallopsPrivileges(self):
+        """
+        https://github.com/ircdocs/modern-irc/pull/118
+        """
+        self.connectClient("nick1")
+        self.sendLine(1, "WALLOPS :hi everyone")
+        message = self.getMessage(1)
+        if message.command == ERR_UNKNOWNCOMMAND:
+            raise runner.NotImplementedByController("WALLOPS")
+        self.assertMessageMatch(
+            message, command=ERR_NOPRIVILEGES, params=["nick1", ANYSTR]
+        )