diff --git a/irctest/basecontrollers.py b/irctest/basecontrollers.py
index b1464ac4..cbc56aae 100644
--- a/irctest/basecontrollers.py
+++ b/irctest/basecontrollers.py
@@ -210,9 +210,10 @@ def registerUser(
         case: irctest.cases.BaseServerTestCase,  # type: ignore
         username: str,
         password: Optional[str] = None,
+        **kwargs: Any,
     ) -> None:
         if self.services_controller is not None:
-            self.services_controller.registerUser(case, username, password)
+            self.services_controller.registerUser(case, username, password, **kwargs)
         else:
             raise NotImplementedByController("account registration")
 
@@ -293,7 +294,7 @@ def wait_for_services(self) -> None:
         timeout = time.time() + 5
         while True:
             c.sendLine(f"PRIVMSG {self.server_controller.nickserv} :HELP")
-            msgs = self.getNickServResponse(c)
+            msgs = self.getServiceResponse(c)
             for msg in msgs:
                 if msg.command == "401":
                     # NickServ not available yet
@@ -319,7 +320,7 @@ def wait_for_services(self) -> None:
         c.disconnect()
         self.services_up = True
 
-    def getNickServResponse(self, client: Any) -> List[Message]:
+    def getServiceResponse(self, client: Any) -> List[Message]:
         """Wrapper aroung getMessages() that waits longer, because NickServ
         is queried asynchronously."""
         msgs: List[Message] = []
@@ -333,11 +334,14 @@ def registerUser(
         case: irctest.cases.BaseServerTestCase,  # type: ignore
         username: str,
         password: Optional[str] = None,
+        **kwargs: Any,
     ) -> None:
         if not case.run_services:
             raise ValueError(
                 "Attempted to register a nick, but `run_services` it not True."
             )
+        if kwargs:
+            raise NotImplementedByController(", ".join(kwargs))
         assert password
         client = case.addClient(show_io=True)
         case.sendLine(client, "NICK " + username)
@@ -350,7 +354,7 @@ def registerUser(
             f"PRIVMSG {self.server_controller.nickserv} "
             f":REGISTER {password} foo@example.org",
         )
-        msgs = self.getNickServResponse(case.clients[client])
+        msgs = self.getServiceResponse(case.clients[client])
         if self.server_controller.software_name == "inspircd":
             assert "900" in {msg.command for msg in msgs}, msgs
         assert "NOTICE" in {msg.command for msg in msgs}, msgs
diff --git a/irctest/controllers/anope_services.py b/irctest/controllers/anope_services.py
index f620dd9c..410da5a6 100644
--- a/irctest/controllers/anope_services.py
+++ b/irctest/controllers/anope_services.py
@@ -1,9 +1,12 @@
 import os
 import shutil
 import subprocess
-from typing import Type
+from typing import Any, Optional, Type
 
+from irctest import cases, runner
 from irctest.basecontrollers import BaseServicesController, DirectoryBasedController
+from irctest.client_mock import ClientMock
+from irctest.irc_utils.sasl import sasl_plain_blob
 
 TEMPLATE_CONFIG = """
 serverinfo {{
@@ -30,12 +33,17 @@
     userlen = 10
     hostlen = 64
     chanlen = 32
+    vhost_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-"
 }}
 
 mail {{
     usemail = no
 }}
 
+/************************
+ * NickServ:
+ */
+
 service {{
     nick = "NickServ"
     user = "services"
@@ -57,6 +65,29 @@
 }}
 command {{ service = "NickServ"; name = "REGISTER"; command = "nickserv/register"; }}
 
+
+/************************
+ * HostServ:
+ */
+
+service {{
+    nick = "HostServ"
+    user = "services"
+    host = "services.host"
+    gecos = "vHost Service"
+}}
+module {{
+    name = "hostserv"
+    client = "HostServ"
+}}
+module {{ name = "hs_set" }}
+command {{ service = "HostServ"; name = "SET"; command = "hostserv/set"; }}
+
+
+/************************
+ * Misc:
+ */
+
 options {{
     casemap = "ascii"
     readtimeout = 5s
@@ -66,7 +97,6 @@
 module {{ name = "m_sasl" }}
 module {{ name = "enc_sha256" }}
 module {{ name = "ns_cert" }}
-
 """
 
 
@@ -121,6 +151,39 @@ def run(self, protocol: str, server_hostname: str, server_port: int) -> None:
             # stderr=subprocess.DEVNULL,
         )
 
+    def registerUser(
+        self,
+        case: cases.BaseServerTestCase,  # type: ignore
+        username: str,
+        password: Optional[str] = None,
+        vhost: Optional[str] = None,
+        **kwargs: Any,
+    ) -> None:
+        super().registerUser(case, username, password)
+
+        if vhost:
+            if not password:
+                raise runner.NotImplementedByController(
+                    "vHost for users with no password"
+                )
+            c = ClientMock(name="setVhost", show_io=True)
+            c.connect(self.server_controller.hostname, self.server_controller.port)
+            c.sendLine("CAP REQ :sasl")
+            c.sendLine("NICK " + username)
+            c.sendLine("USER r e g :user")
+            while c.getMessage(synchronize=False).command != "CAP":
+                pass
+            c.sendLine("AUTHENTICATE PLAIN")
+            while c.getMessage(synchronize=False).command != "AUTHENTICATE":
+                pass
+            c.sendLine(sasl_plain_blob(username, password))
+            c.sendLine("CAP END")
+            while c.getMessage(synchronize=False).command != "001":
+                pass
+            c.getMessages()
+            c.sendLine(f"PRIVMSG HostServ :SET {username} {vhost}")
+            self.getServiceResponse(c)
+
 
 def get_irctest_controller_class() -> Type[AnopeController]:
     return AnopeController
diff --git a/irctest/controllers/inspircd.py b/irctest/controllers/inspircd.py
index 1cd40ba2..e1a869ea 100644
--- a/irctest/controllers/inspircd.py
+++ b/irctest/controllers/inspircd.py
@@ -61,10 +61,12 @@
 # Protocol:
 <module name="botmode">
 <module name="cap">
+<module name="chghost">
 <module name="ircv3">
 <module name="ircv3_accounttag">
 <module name="ircv3_batch">
 <module name="ircv3_capnotify">
+<module name="ircv3_chghost">
 <module name="ircv3_ctctags">
 <module name="ircv3_echomessage">
 <module name="ircv3_invitenotify">
diff --git a/irctest/server_tests/chghost.py b/irctest/server_tests/chghost.py
new file mode 100644
index 00000000..0b52e740
--- /dev/null
+++ b/irctest/server_tests/chghost.py
@@ -0,0 +1,46 @@
+"""
+<http://ircv3.net/specs/extensions/chghost.html>
+"""
+
+from irctest import cases
+from irctest.irc_utils.sasl import sasl_plain_blob
+from irctest.patma import ANYSTR, StrRe
+
+
+@cases.mark_services
+class ChghostServicesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper):
+    def testChghostFromServices(self):
+        self.connectClient("observer", capabilities=["chghost"], skip_if_cap_nak=True)
+        self.connectClient("oldclient")
+
+        self.controller.registerUser(
+            self, "vhostuser", "sesame", vhost="vhost.example.com"
+        )
+        self.connectClient("vhost-user", capabilities=["sasl"], skip_if_cap_nak=True)
+
+        for i in (1, 2, 3):
+            self.sendLine(i, "JOIN #chan")
+            self.getMessages(i)
+
+        for i in (1, 2, 3):
+            self.getMessages(i)
+
+        self.sendLine(3, "AUTHENTICATE PLAIN")
+        self.assertMessageMatch(
+            self.getRegistrationMessage(3),
+            command="AUTHENTICATE",
+            params=["+"],
+        )
+        self.sendLine(3, sasl_plain_blob("vhostuser", "sesame"))
+        self.assertMessageMatch(
+            self.getRegistrationMessage(3),
+            command="900",
+        )
+
+        self.assertMessageMatch(
+            self.getMessage(1),
+            prefix=StrRe("vhost-user!.*@(?!vhost-user.example)"),
+            command="CHGHOST",
+            params=[ANYSTR, "vhost.example.com"],
+        )
+        self.assertEqual(self.getMessages(2), [])  # cycle?