diff --git a/lib/client.js b/lib/client.js
index 52be399..1df973c 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -176,7 +176,15 @@ Client.prototype.getBulk = function (ip, community, non_repeaters, repeaters,
 Client.prototype.SNMPv2_Trap =
 Client.prototype.inform = function (ip, community, uptime, oid, varbinds, cb) {
 	var self = this;
-	send(this, ip, 162, message.createMessage({
+	
+	var port = 162;
+	var addr = ip.split(":");
+	if (addr.length == 2) {
+		ip = addr[0];
+		port = parseInt(addr[1]);
+	}
+	
+	send(this, ip, port, message.createMessage({
 		version: 1,
 		community: community,
 		pdu: PDU.createPDU({