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diff --git a/linden/indra/llmessage/llhost.h b/linden/indra/llmessage/llhost.h
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+++ b/linden/indra/llmessage/llhost.h
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+/** 
+ * @file llhost.h
+ * @brief a LLHost uniquely defines a host (Simulator, Proxy or other)
+ * across the network
+ *
+ * Copyright (c) 2000-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_LLHOST_H
+#define LL_LLHOST_H
+
+#include <iostream>
+#include <string>
+
+#include "net.h"
+
+#include "llstring.h"
+
+const U32 INVALID_PORT = 0;
+const U32 INVALID_HOST_IP_ADDRESS = 0x0;
+
+class LLHost {
+protected:
+        U32                     mPort;
+        U32         mIP;
+public:
+        
+        static LLHost invalid;
+
+        // CREATORS
+        LLHost()
+        :       mPort(INVALID_PORT),
+                mIP(INVALID_HOST_IP_ADDRESS)
+        { } // STL's hash_map expect this T()
+
+        LLHost( U32 ipv4_addr, U32 port )
+        :       mPort( port ) 
+        {
+                mIP = ipv4_addr;
+        }
+
+        LLHost( const char *ipv4_addr, U32 port )
+        :       mPort( port )
+        { 
+                mIP = ip_string_to_u32(ipv4_addr);
+        }
+
+        explicit LLHost(const U64 ip_port)
+        {
+                U32 ip = (U32)(ip_port >> 32);
+                U32 port = (U32)(ip_port & (U64)0xFFFFFFFF);
+                mIP = ip;
+                mPort = port;
+        }
+
+        explicit LLHost(const std::string& ip_and_port);
+
+        ~LLHost()
+        { }
+
+        // MANIPULATORS
+        void    set( U32 ip, U32 port )                         { mIP = ip; mPort = port; }
+        void    set( const char* ipstr, U32 port )      { mIP = ip_string_to_u32(ipstr); mPort = port; }
+        void    setAddress( const char* ipstr )         { mIP = ip_string_to_u32(ipstr); }
+        void    setAddress( U32 ip )                            { mIP = ip; }
+        void    setPort( U32 port )                                     { mPort = port; }
+        BOOL    setHostByName(const char *hname);
+
+        LLHost& operator=(const LLHost &rhs);
+        void    invalidate()                        { mIP = INVALID_HOST_IP_ADDRESS; mPort = INVALID_PORT;};
+
+        // READERS
+        U32             getAddress() const                                                      { return mIP; }
+        U32             getPort() const                                                         { return mPort; }
+        BOOL    isOk() const                                                            { return (mIP != INVALID_HOST_IP_ADDRESS) && (mPort != INVALID_PORT); }
+        size_t  hash() const                                                            { return (mIP << 16) | (mPort & 0xffff); }
+        void    getString(char* buffer, S32 length) const;          // writes IP:port into buffer
+        void    getIPString(char* buffer, S32 length) const;    // writes IP into buffer
+        std::string getIPString() const;
+        void    getHostName(char *buf, S32 len) const;
+        LLString getHostName() const;
+        std::string getIPandPort() const;
+
+        friend std::ostream& operator<< (std::ostream& os, const LLHost &hh);
+        friend std::istream& operator>> (std::istream& is, LLHost &hh);
+        friend bool operator==( const LLHost &lhs, const LLHost &rhs );
+        friend bool operator!=( const LLHost &lhs, const LLHost &rhs );
+        friend bool operator<(const LLHost &lhs, const LLHost &rhs);
+};
+
+
+// Function Object required for STL templates using LLHost as key 
+class LLHostHash
+{
+public:
+        size_t operator() (const LLHost &hh) const { return hh.hash(); }
+};
+
+
+inline bool operator==( const LLHost &lhs, const LLHost &rhs )
+{
+        return (lhs.mIP == rhs.mIP) && (lhs.mPort == rhs.mPort);
+}
+
+inline bool operator!=( const LLHost &lhs, const LLHost &rhs )
+{
+        return (lhs.mIP != rhs.mIP) || (lhs.mPort != rhs.mPort);
+}
+
+inline bool operator<(const LLHost &lhs, const LLHost &rhs)
+{
+        if (lhs.mIP < rhs.mIP)
+        {
+                return true;
+        }
+        if (lhs.mIP > rhs.mIP)
+        {
+                return false;
+        }
+
+        if (lhs.mPort < rhs.mPort)
+        {
+                return true;
+        }
+        else
+        {
+                return false;
+        }
+}
+
+
+#endif // LL_LLHOST_H