diff --git a/sshuttle/server.py b/sshuttle/server.py
index 4ae2749..78252b8 100644
--- a/sshuttle/server.py
+++ b/sshuttle/server.py
@@ -17,6 +17,7 @@ from sshuttle.helpers import log, debug1, debug2, debug3, Fatal, \
 
 
 def _ipmatch(ipstr):
+    # FIXME: IPv4 only
     if ipstr == b'default':
         ipstr = b'0.0.0.0/0'
     m = re.match(b'^(\d+(\.\d+(\.\d+(\.\d+)?)?)?)(?:/(\d+))?$', ipstr)
@@ -38,6 +39,7 @@ def _ipmatch(ipstr):
 
 
 def _ipstr(ip, width):
+    # FIXME: IPv4 only
     if width >= 32:
         return ip
     else:
@@ -45,6 +47,7 @@ def _ipstr(ip, width):
 
 
 def _maskbits(netmask):
+    # FIXME: IPv4 only
     if not netmask:
         return 32
     for i in range(32):
diff --git a/sshuttle/tests/server/test_server.py b/sshuttle/tests/server/test_server.py
index 34ad2a7..bf6985f 100644
--- a/sshuttle/tests/server/test_server.py
+++ b/sshuttle/tests/server/test_server.py
@@ -1,7 +1,63 @@
+import io
+import socket
 import sshuttle.server
+from mock import patch, Mock, call
 
 
 def test__ipmatch():
-    assert sshuttle.server._ipmatch("1.2.3.4") is not None
-    assert sshuttle.server._ipmatch("::1") is not None
-    assert sshuttle.server._ipmatch("42 Example Street, Melbourne") is None
+    assert sshuttle.server._ipmatch(b"1.2.3.4") is not None
+    assert sshuttle.server._ipmatch(b"::1") is None   # ipv6 not supported
+    assert sshuttle.server._ipmatch(b"42 Example Street, Melbourne") is None
+
+
+def test__ipstr():
+    assert sshuttle.server._ipstr("1.2.3.4", 24) == "1.2.3.4/24"
+    assert sshuttle.server._ipstr("1.2.3.4", 32) == "1.2.3.4"
+
+
+def test__maskbits():
+    netmask = sshuttle.server._ipmatch(b"255.255.255.0")
+    sshuttle.server._maskbits(netmask)
+
+
+@patch('sshuttle.server.ssubprocess.Popen')
+def test__listroutes(mock_popen):
+    mock_pobj = Mock()
+    mock_pobj.stdout = io.BytesIO(b"""
+Kernel IP routing table
+Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
+0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 wlan0
+192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0
+""")
+    mock_pobj.wait.return_value = 0
+    mock_popen.return_value = mock_pobj
+
+    routes = sshuttle.server._list_routes()
+
+    assert mock_popen.mock_calls == [
+        call(['netstat', '-rn'], stdout=-1),
+        call().wait()
+    ]
+    assert routes == [
+        (socket.AF_INET, '0.0.0.0', 0),
+        (socket.AF_INET, '192.168.1.0', 24)
+    ]
+
+
+@patch('sshuttle.server.ssubprocess.Popen')
+def test_listroutes(mock_popen):
+    mock_pobj = Mock()
+    mock_pobj.stdout = io.BytesIO(b"""
+Kernel IP routing table
+Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
+0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 wlan0
+192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0
+""")
+    mock_pobj.wait.return_value = 0
+    mock_popen.return_value = mock_pobj
+
+    routes = sshuttle.server.list_routes()
+
+    assert list(routes) == [
+        (socket.AF_INET, '192.168.1.0', 24)
+    ]