--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2418,6 +2418,7 @@
         }
 
         // Store the new addresses
+        vector<CAddress> vAddrOk;
         int64 nNow = GetAdjustedTime();
         int64 nSince = nNow - 10 * 60;
         BOOST_FOREACH(CAddress& addr, vAddr)
@@ -2427,6 +2428,7 @@
             if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
                 addr.nTime = nNow - 5 * 24 * 60 * 60;
             pfrom->AddAddressKnown(addr);
+            bool fReachable = IsReachable(addr);
             if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
             {
                 // Relay to a limited number of other nodes
@@ -2451,13 +2453,16 @@
                         hashKey = Hash(BEGIN(hashKey), END(hashKey));
                         mapMix.insert(make_pair(hashKey, pnode));
                     }
-                    int nRelayNodes = 2;
+                    int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
                     for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
                         ((*mi).second)->PushAddress(addr);
                 }
             }
+            // Do not store addresses outside our network
+            if (fReachable)
+                vAddrOk.push_back(addr);
         }
-        addrman.Add(vAddr, pfrom->addr, 2 * 60 * 60);
+        addrman.Add(vAddrOk, pfrom->addr, 2 * 60 * 60);
         if (vAddr.size() < 1000)
             pfrom->fGetAddr = false;
         if (pfrom->fOneShot)

--- a/src/net.cpp
+++ b/src/net.cpp
@@ -45,8 +45,9 @@
 bool fClient = false;
 static bool fUseUPnP = false;
 uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK);
-CCriticalSection cs_mapLocalHost;
-map<CNetAddr, int> mapLocalHost;
+static CCriticalSection cs_mapLocalHost;
+static map<CNetAddr, int> mapLocalHost;
+static bool vfReachable[NET_MAX] = {};
 static CNode* pnodeLocalHost = NULL;
 uint64 nLocalHostNonce = 0;
 array<int, THREAD_MAX> vnThreadsRunning;
@@ -214,6 +215,9 @@
     {
         LOCK(cs_mapLocalHost);
         mapLocalHost[addr] = std::max(nScore, mapLocalHost[addr]) + (mapLocalHost.count(addr) ? 1 : 0);
+        enum Network net = addr.GetNetwork();
+        vfReachable[net] = true;
+        if (net == NET_IPV6) vfReachable[NET_IPV4] = true;
     }
 
     AdvertizeLocal();
@@ -243,6 +247,12 @@
     return mapLocalHost.count(addr) > 0;
 }
 
+// check whether a given address is in a network we can probably connect to
+bool IsReachable(const CNetAddr& addr)
+{
+    LOCK(cs_mapLocalHost);
+    return vfReachable[addr.GetNetwork()];
+}
 
 bool GetMyExternalIP2(const CService& addrConnect, const char* pszGet, const char* pszKeyword, CNetAddr& ipRet)
 {

--- a/src/net.h
+++ b/src/net.h
@@ -58,8 +58,10 @@
 bool SeenLocal(const CNetAddr& addr);
 bool IsLocal(const CNetAddr& addr);
 bool GetLocal(CNetAddr &addr, const CNetAddr *paddrPeer = NULL);
+bool IsReachable(const CNetAddr &addr);
 CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
 
+
 enum
 {
     MSG_TX = 1,

--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -25,6 +25,14 @@
 
 static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
 
+enum Network ParseNetwork(std::string net) {
+    if (net == "ipv4") return NET_IPV4;
+    if (net == "ipv6") return NET_IPV6;
+    if (net == "tor")  return NET_TOR;
+    if (net == "i2p")  return NET_I2P;
+    return NET_UNROUTABLE;
+}
+
 bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 {
     vIP.clear();
@@ -688,6 +696,23 @@
     return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsOnionCat() && !IsGarliCat()) || IsRFC4843() || IsLocal());
 }
 
+enum Network CNetAddr::GetNetwork() const
+{
+    if (!IsRoutable())
+        return NET_UNROUTABLE;
+
+    if (IsIPv4())
+        return NET_IPV4;
+
+    if (IsOnionCat())
+        return NET_TOR;
+
+    if (IsGarliCat())
+        return NET_I2P;
+
+    return NET_IPV6;
+}
+
 std::string CNetAddr::ToStringIP() const
 {
     if (IsIPv4())

--- a/src/netbase.h
+++ b/src/netbase.h
@@ -17,6 +17,19 @@
 #undef SetPort
 #endif
 
+enum Network
+{
+    NET_UNROUTABLE,
+    NET_IPV4,
+    NET_IPV6,
+    NET_TOR,
+    NET_I2P,
+
+    NET_MAX
+};
+
+enum Network ParseNetwork(std::string net);
+
 /** IP address (IPv6, or IPv4 using mapped IPv6 range (::FFFF:0:0/96)) */
 class CNetAddr
 {
@@ -48,6 +61,7 @@
         bool IsRoutable() const;
         bool IsValid() const;
         bool IsMulticast() const;
+        enum Network GetNetwork() const;
         std::string ToString() const;
         std::string ToStringIP() const;
         int GetByte(int n) const;