diff --git a/NTCPSession.cpp b/NTCPSession.cpp
index 61e7944f..3e3d551d 100644
--- a/NTCPSession.cpp
+++ b/NTCPSession.cpp
@@ -517,10 +517,10 @@ namespace ntcp
 	}	
 		
 		
-	NTCPClient::NTCPClient (boost::asio::io_service& service, const char * address, 
+	NTCPClient::NTCPClient (boost::asio::io_service& service, const boost::asio::ip::address& address, 
 		int port, i2p::data::RouterInfo& in_RouterInfo): 
 		NTCPSession (service, in_RouterInfo),
-		m_Endpoint (boost::asio::ip::address::from_string (address), port)	
+		m_Endpoint (address, port)	
 	{
 		Connect ();
 	}
diff --git a/NTCPSession.h b/NTCPSession.h
index 5d33ef10..71cf5af9 100644
--- a/NTCPSession.h
+++ b/NTCPSession.h
@@ -144,7 +144,7 @@ namespace ntcp
 	{
 		public:
 
-			NTCPClient (boost::asio::io_service& service, const char * address, int port, i2p::data::RouterInfo& in_RouterInfo);
+			NTCPClient (boost::asio::io_service& service, const boost::asio::ip::address& address, int port, i2p::data::RouterInfo& in_RouterInfo);
 
 		private:
 
diff --git a/RouterContext.cpp b/RouterContext.cpp
index d3e1def1..3274f82d 100644
--- a/RouterContext.cpp
+++ b/RouterContext.cpp
@@ -45,7 +45,7 @@ namespace i2p
 		auto address = m_RouterInfo.GetNTCPAddress ();
 		if (address)
 		{
-			address->host = host;
+			address->host = boost::asio::ip::address::from_string (host);
 			address->port = port;
 		}	
 
@@ -80,4 +80,4 @@ namespace i2p
 		std::ofstream fi(ROUTER_INFO, std::ios::binary);
 		fi.write ((char *)m_RouterInfo.GetBuffer (), m_RouterInfo.GetBufferLen ());
 	}	
-}	
\ No newline at end of file
+}	
diff --git a/RouterInfo.cpp b/RouterInfo.cpp
index a0c40dd7..c804cadb 100644
--- a/RouterInfo.cpp
+++ b/RouterInfo.cpp
@@ -101,7 +101,16 @@ namespace data
 				r += ReadString (value, s); 
 				s.seekg (1, std::ios_base::cur); r++; // ;
 				if (!strcmp (key, "host"))
-					address.host = value;
+				{	
+					boost::system::error_code ecode;
+					address.host = boost::asio::ip::address::from_string (value, ecode);
+					if (ecode)
+					{	
+						// TODO: we should try to resolve address here
+						LogPrint ("Unexpected address ", value);
+						SetUnreachable (true);
+					}		
+				}	
 				else if (!strcmp (key, "port"))
 					address.port = boost::lexical_cast<int>(value);
 			}	
@@ -166,7 +175,7 @@ namespace data
 			std::stringstream properties;
 			WriteString ("host", properties);
 			properties << '=';
-			WriteString (address.host, properties);
+			WriteString (address.host.to_string (), properties);
 			properties << ';';
 			WriteString ("port", properties);
 			properties << '=';
@@ -237,7 +246,7 @@ namespace data
 	void RouterInfo::AddNTCPAddress (const char * host, int port)
 	{
 		Address addr;
-		addr.host = host;
+		addr.host = boost::asio::ip::address::from_string (host);
 		addr.port = port;
 		addr.transportStyle = eTransportNTCP;
 		addr.cost = 2;
@@ -266,22 +275,28 @@ namespace data
 		return false;	
 	}	
 
-	bool RouterInfo::IsNTCP () const
+	bool RouterInfo::IsNTCP (bool v4only) const
 	{
 		for (auto& address : m_Addresses)
 		{
 			if (address.transportStyle == eTransportNTCP)
-				return true;
+			{	
+				if (!v4only || address.host.is_v4 ())
+					return true;
+			}	
 		}		
 		return false;
 	}	
 
-	RouterInfo::Address * RouterInfo::GetNTCPAddress () 
+	RouterInfo::Address * RouterInfo::GetNTCPAddress (bool v4only)
 	{
 		for (auto& address : m_Addresses)
 		{
 			if (address.transportStyle == eTransportNTCP)
-				return &address;
+			{	
+				if (!v4only || address.host.is_v4 ())
+					return &address;
+			}	
 		}	
 		return nullptr;
 	}	
diff --git a/RouterInfo.h b/RouterInfo.h
index a8d59adf..44dae3f1 100644
--- a/RouterInfo.h
+++ b/RouterInfo.h
@@ -27,7 +27,7 @@ namespace data
 			struct Address
 			{
 				TransportStyle transportStyle;
-				std::string host;
+				boost::asio::ip::address host;
 				int port;
 				uint64_t date;
 				uint8_t cost;
@@ -45,14 +45,14 @@ namespace data
 			const char * GetIdentHashAbbreviation () const { return m_IdentHashAbbreviation; };
 			uint64_t GetTimestamp () const { return m_Timestamp; };
 			const std::vector<Address>& GetAddresses () const { return m_Addresses; };
-			Address * GetNTCPAddress ();
+			Address * GetNTCPAddress (bool v4only = true);
 			const RoutingKey& GetRoutingKey () const { return m_RoutingKey; };
 			
 			void AddNTCPAddress (const char * host, int port);
 			void SetProperty (const char * key, const char * value);
 			const char * GetProperty (const char * key) const;
 			bool IsFloodfill () const;
-			bool IsNTCP () const;
+			bool IsNTCP (bool v4only = true) const;
 			void SetUnreachable (bool unreachable) { m_IsUnreachable = unreachable; }; 
 			bool IsUnreachable () const { return m_IsUnreachable; };
 			
diff --git a/Transports.cpp b/Transports.cpp
index 371ea2e6..31d0325f 100644
--- a/Transports.cpp
+++ b/Transports.cpp
@@ -139,7 +139,7 @@ namespace i2p
 				auto address = r->GetNTCPAddress ();
 				if (address)
 				{	
-					session = new i2p::ntcp::NTCPClient (m_Service, address->host.c_str (), address->port, *r);
+					session = new i2p::ntcp::NTCPClient (m_Service, address->host, address->port, *r);
 					AddNTCPSession (session);
 				}	
 				else