diff --git a/mediaproxy/iputils.py b/mediaproxy/iputils.py
index c172aab..4774673 100644
--- a/mediaproxy/iputils.py
+++ b/mediaproxy/iputils.py
@@ -1,45 +1,50 @@
 
 """IP address utilities"""
 
 __all__ = ["is_routable_ip"]
 
 import socket
 import struct
 
 from application.configuration.datatypes import NetworkRangeList
 
 from mediaproxy.configuration import RelayConfig
 
 
-# Non routable network addresses (RFC 3330)
+# Non routable network addresses (RFC 6890)
 #
 _non_routable_netlist = [
     '0.0.0.0/8',
     '10.0.0.0/8',
+    '100.64.0.0/10',
     '127.0.0.0/8',
     '169.254.0.0/16',
     '172.16.0.0/12',
+    '192.0.0.0/24',
     '192.0.2.0/24',
+    '192.88.99.0/24',
     '192.168.0.0/16',
+    '198.18.0.0/15',
     '198.51.100.0/24',
     '203.0.113.0/24',
     '224.0.0.0/4',
+    '240.0.0.0/4',
     '255.255.255.255/32'
 ]
 
 _non_routable_nets = NetworkRangeList(_non_routable_netlist)
 
 
 def is_routable_ip(ip):
     try:
         ip_addr = struct.unpack('!L', socket.inet_aton(ip))[0]
     except:
         return False
     for netbase, mask in RelayConfig.routable_private_ranges:
         if (ip_addr & mask) == netbase:
             return True
     for netbase, mask in _non_routable_nets:
         if (ip_addr & mask) == netbase:
             return False
     return True