diff --git a/get_routable_ip.py b/get_routable_ip.py
new file mode 100644
index 0000000..cf392c8
--- /dev/null
+++ b/get_routable_ip.py
@@ -0,0 +1,18 @@
+"""Some useful functions."""
+
+import socket
+
+
+def get_ip():
+    """Return the primary, routable, IP address.
+       From https://stackoverflow.com/a/28950776
+    """
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    try:
+        s.connect(('10.255.255.255', 1))
+        IP = s.getsockname()[0]
+    except:
+        IP = '127.0.0.1'
+    finally:
+        s.close()
+    return IP