Index: code/ui/ui_main.c
===================================================================
--- code/ui/ui_main.c	(revision 1788)
+++ code/ui/ui_main.c	(working copy)
@@ -116,8 +116,9 @@
 static char* netnames[] = {
 	"???",
 	"UDP",
-	NULL
+	"UDP6"
 };
+static const int numNetnames = sizeof(netnames) / sizeof(char*);
 
 #ifndef MISSIONPACK
 static char quake3worldMessage[] = "Visit www.quake3world.com - News, Community, Events, Files";
@@ -4307,9 +4308,15 @@
 						return Info_ValueForKey(info, "addr");
 					} else {
 						if ( ui_netSource.integer == AS_LOCAL ) {
+							int nettype = atoi(Info_ValueForKey(info, "nettype"));
+
+							if (nettype < 0 || nettype >= numNetnames) {
+								nettype = 0;
+							}
+
 							Com_sprintf( hostname, sizeof(hostname), "%s [%s]",
 											Info_ValueForKey(info, "hostname"),
-											netnames[atoi(Info_ValueForKey(info, "nettype"))] );
+											netnames[nettype] );
 							return hostname;
 						}
 						else {