diff --git a/src/conf.py b/src/conf.py
index 9082ffdc0..80f1dc6a5 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -1246,15 +1246,18 @@ class IP(registry.String):
         else:
             registry.String.setValue(self, v)
 
+class ListOfIPs(registry.SpaceSeparatedListOfStrings):
+    Value = IP
+
 registerGlobalValue(supybot.servers.http, 'singleStack',
     registry.Boolean(True, _("""If true, uses IPV6_V6ONLY to disable
     forwaring of IPv4 traffic to IPv6 sockets. On *nix, has the same
     effect as setting kernel variable net.ipv6.bindv6only to 1.""")))
 registerGlobalValue(supybot.servers.http, 'hosts4',
-    IP('0.0.0.0', _("""Space-separated list of IPv4 hosts the HTTP server
+    ListOfIPs(['0.0.0.0'], _("""Space-separated list of IPv4 hosts the HTTP server
     will bind.""")))
 registerGlobalValue(supybot.servers.http, 'hosts6',
-    IP('::0', _("""Space-separated list of IPv6 hosts the HTTP server will
+    ListOfIPs(['::0'], _("""Space-separated list of IPv6 hosts the HTTP server will
     bind.""")))
 registerGlobalValue(supybot.servers.http, 'port',
     registry.Integer(8080, _("""Determines what port the HTTP server will
diff --git a/src/httpserver.py b/src/httpserver.py
index 734b104cd..59c2ca274 100644
--- a/src/httpserver.py
+++ b/src/httpserver.py
@@ -434,9 +434,9 @@ def startServer():
     The callback should be an instance of a child of SupyHTTPServerCallback."""
     global http_servers
     addresses4 = [(4, (x, configGroup.port()))
-            for x in configGroup.hosts4().split(' ') if x != '']
+            for x in configGroup.hosts4() if x != '']
     addresses6 = [(6, (x, configGroup.port()))
-            for x in configGroup.hosts6().split(' ') if x != '']
+            for x in configGroup.hosts6() if x != '']
     http_servers = []
     for protocol, address in (addresses4 + addresses6):
         server = SupyHTTPServer(address, protocol, SupyHTTPRequestHandler)
diff --git a/src/utils/net.py b/src/utils/net.py
index 7f8633d72..dbcc65d22 100644
--- a/src/utils/net.py
+++ b/src/utils/net.py
@@ -108,6 +108,9 @@ def isIPV4(s):
     >>> isIPV4('abc.abc.abc.abc')
     0
     """
+    if set(s) - set('0123456789.'):
+        # inet_aton ignores trailing data after the first valid IP address
+        return False
     try:
         return bool(socket.inet_aton(str(s)))
     except socket.error:
diff --git a/test/test_utils.py b/test/test_utils.py
index cfc106af3..be77d1244 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -514,12 +514,14 @@ class NetTest(SupyTestCase):
         isIP = utils.net.isIP
         self.failIf(isIP('a.b.c'))
         self.failIf(isIP('256.0.0.0'))
+        self.failIf(isIP('127.0.0.1 127.0.0.1'))
         self.failUnless(isIP('0.0.0.0'))
         self.failUnless(isIP('100.100.100.100'))
         self.failUnless(isIP('255.255.255.255'))
 
     def testIsIPV6(self):
         f = utils.net.isIPV6
+        self.failIf(f('2001:: 2001::'))
         self.failUnless(f('2001::'))
         self.failUnless(f('2001:888:0:1::666'))