diff --git a/protocols/clientbot.py b/protocols/clientbot.py
index 60bcd34..1627797 100644
--- a/protocols/clientbot.py
+++ b/protocols/clientbot.py
@@ -14,7 +14,7 @@ class ClientbotWrapperProtocol(Protocol):
     def __init__(self, irc):
         super().__init__(irc)
 
-        self.protocol_caps = {'clear-channels-on-leave'}
+        self.protocol_caps = {'clear-channels-on-leave', 'slash-in-nicks', 'slash-in-hosts', 'underscore-in-hosts'}
 
         self.has_eob = False
 
diff --git a/protocols/inspircd.py b/protocols/inspircd.py
index 1929e23..05fdcf7 100644
--- a/protocols/inspircd.py
+++ b/protocols/inspircd.py
@@ -13,6 +13,9 @@ from pylinkirc.protocols.ts6_common import *
 class InspIRCdProtocol(TS6BaseProtocol):
     def __init__(self, irc):
         super().__init__(irc)
+
+        self.protocol_caps |= {'slash-in-nicks', 'slash-in-hosts', 'underscore-in-hosts'}
+
         # Set our case mapping (rfc1459 maps "\" and "|" together, for example).
         self.casemapping = 'rfc1459'
 
diff --git a/protocols/nefarious.py b/protocols/nefarious.py
index 14642ac..85b39e1 100644
--- a/protocols/nefarious.py
+++ b/protocols/nefarious.py
@@ -35,6 +35,9 @@ def p10b64encode(num, length=2):
 class P10SIDGenerator():
     def __init__(self, irc):
         self.irc = irc
+
+        self.protocol_caps |= {'slash-in-hosts', 'underscore-in-hosts'}
+
         try:
             query = irc.serverdata["sidrange"]
         except (KeyError, ValueError):
diff --git a/protocols/ts6.py b/protocols/ts6.py
index ff9ac05..1097bb3 100644
--- a/protocols/ts6.py
+++ b/protocols/ts6.py
@@ -15,6 +15,7 @@ S2S_BUFSIZE = 510
 class TS6Protocol(TS6BaseProtocol):
     def __init__(self, irc):
         super().__init__(irc)
+        self.protocol_caps |= {'slash-in-hosts'}
         self.casemapping = 'rfc1459'
         self.hook_map = {'SJOIN': 'JOIN', 'TB': 'TOPIC', 'TMODE': 'MODE', 'BMASK': 'MODE',
                          'EUID': 'UID', 'RSFNC': 'SVSNICK', 'ETB': 'TOPIC'}
diff --git a/protocols/unreal.py b/protocols/unreal.py
index ff29767..010a4d7 100644
--- a/protocols/unreal.py
+++ b/protocols/unreal.py
@@ -23,6 +23,7 @@ S2S_BUFSIZE = 427
 class UnrealProtocol(TS6BaseProtocol):
     def __init__(self, irc):
         super().__init__(irc)
+        self.protocol_caps |= {'slash-in-nicks', 'underscore-in-hosts'}
         # Set our case mapping (rfc1459 maps "\" and "|" together, for example)
         self.casemapping = 'ascii'
         self.proto_ver = 4000