diff --git a/include/tins/hw_address.h b/include/tins/hw_address.h
index 240e7df..5715f8b 100644
--- a/include/tins/hw_address.h
+++ b/include/tins/hw_address.h
@@ -59,6 +59,9 @@ TINS_API bool hw_address_equal_compare(const uint8_t* start1, const uint8_t* end
 TINS_API bool hw_address_lt_compare(const uint8_t* start1, const uint8_t* end1,
                                     const uint8_t* start2, const uint8_t* end2);
 
+TINS_API bool hw_address_gt_compare(const uint8_t* start1, const uint8_t* end1,
+                                    const uint8_t* start2, const uint8_t* end2);
+
 /**
  * \endcond
  */
@@ -268,6 +271,39 @@ public:
         return Internals::hw_address_lt_compare(begin(), end(), rhs.begin(), rhs.end());
     }
 
+    /**
+     * \brief Compares this HWAddress for less-than equality.
+     *
+     * \param rhs The HWAddress to be compared to.
+     *
+     * \return bool indicating whether this address is equal or less-than rhs.
+     */
+    bool operator<=(const HWAddress& rhs) const {
+        return !operator>(rhs);
+    }
+
+    /**
+     * \brief Compares this HWAddress for greater-than inequality.
+     *
+     * \param rhs The HWAddress to be compared to.
+     *
+     * \return bool indicating whether this address is greater-than rhs.
+     */
+    bool operator>(const HWAddress& rhs) const {
+        return Internals::hw_address_gt_compare(begin(), end(), rhs.begin(), rhs.end());
+    }
+
+    /**
+     * \brief Compares this HWAddress for greater-than equality.
+     *
+     * \param rhs The HWAddress to be compared to.
+     *
+     * \return bool indicating whether this address is equal or greater-than rhs.
+     */
+    bool operator>=(const HWAddress& rhs) const {
+        return !operator<(rhs);
+    }
+
     /**
      * \brief Apply a mask to this address
      * 
@@ -281,7 +317,33 @@ public:
         }
         return output;
     }
-    
+
+    /**
+    * \brief Apply a mask to this address
+    *
+    * \param mask The mask to be applied
+    * \return The result of applying the mask to this address
+    */
+   HWAddress operator|(const HWAddress& mask) const {
+       HWAddress<n> output = *this;
+       for (size_t i = 0; i < n; ++i) {
+           output[i] = output[i] | mask[i];
+       }
+       return output;
+   }
+
+   /**
+    * \brief not operator
+    * \return The result of applying the mask to this address
+    */
+   HWAddress operator~() const {
+       HWAddress<n> output = *this;
+       for (size_t i = 0; i < n; ++i) {
+           output[i] = ~output[i];
+       }
+       return output;
+   }
+
     /**
      * \brief Retrieves the size of this address.
      * 
diff --git a/include/tins/ip_address.h b/include/tins/ip_address.h
index 8db32ec..5e6f6d1 100644
--- a/include/tins/ip_address.h
+++ b/include/tins/ip_address.h
@@ -135,6 +135,38 @@ public:
         return ip_addr_ < rhs.ip_addr_;
     }
 
+    /**
+     * \brief Compares this address for less-than equality.
+     *
+     * \param rhs The address to be compared to.
+     *
+     * \return bool indicating whether this address is equal or less-than rhs.
+     */
+    bool operator<=(const IPv4Address& rhs) const {
+        return !operator>(rhs);
+    }
+
+    /**
+     * \brief Compare this IPv4Address for greater-than inequality.
+     *
+     * \param rhs The address to be compared.
+     * \return bool indicating whether this address is greater-than rhs.
+     */
+    bool operator>(const IPv4Address& rhs) const {
+        return ip_addr_ > rhs.ip_addr_;
+    }
+
+    /**
+     * \brief Compares this address for greater-than equality.
+     *
+     * \param rhs The address to be compared to.
+     *
+     * \return bool indicating whether this address is equal or greater-than rhs.
+     */
+    bool operator>=(const IPv4Address& rhs) const {
+        return !operator<(rhs);
+    }
+
     /**
      * \brief Apply a mask to this address
      * 
@@ -142,6 +174,19 @@ public:
      * \return The result of applying the mask to this address
      */
     IPv4Address operator&(const IPv4Address& mask) const;
+
+    /**
+     * \brief Apply a mask to this address
+     *
+     * \param mask The mask to be applied
+     * \return The result of applying the mask to this address
+     */
+    IPv4Address operator|(const IPv4Address& mask) const;
+
+    /**
+     * not operator (invert)
+     */
+    IPv4Address operator~() const;
     
     /**
      * \brief Returns true if this is a private IPv4 address.
diff --git a/include/tins/ipv6_address.h b/include/tins/ipv6_address.h
index 43d4995..553e38e 100644
--- a/include/tins/ipv6_address.h
+++ b/include/tins/ipv6_address.h
@@ -160,7 +160,40 @@ public:
     bool operator<(const IPv6Address& rhs) const {
         return std::lexicographical_compare(begin(), end(), rhs.begin(), rhs.end());
     }
-    
+
+    /**
+     * \brief Compares this address for less-than equality.
+     *
+     * \param rhs The address to be compared to.
+     *
+     * \return bool indicating whether this address is equal or less-than rhs.
+     */
+    bool operator<=(const IPv6Address& rhs) const {
+        return !operator>(rhs);
+    }
+
+    /**
+     * \brief Compares this address for greater-than inequality.
+     *
+     * \param rhs The address to be compared to.
+     *
+     * \return bool indicating whether this address is greater-than rhs.
+     */
+    bool operator>(const IPv6Address& rhs) const {
+        return std::lexicographical_compare(rhs.begin(), rhs.end(), begin(), end());
+    }
+
+    /**
+     * \brief Compares this address for greater-than equality.
+     *
+     * \param rhs The address to be compared to.
+     *
+     * \return bool indicating whether this address is equal or greater-than rhs.
+     */
+    bool operator>=(const IPv6Address& rhs) const {
+        return !operator<(rhs);
+    }
+
     /**
      * \brief Helper function which copies the address into an output
      * iterator.
@@ -218,7 +251,17 @@ public:
     /**
      * Applies a mask to an address
      */
-    TINS_API friend IPv6Address operator&(const IPv6Address& lhs, const IPv6Address& rhs);
+    IPv6Address operator&(const IPv6Address& rhs) const;
+
+    /**
+     * or a mask to an address
+     */
+    IPv6Address operator|(const IPv6Address& rhs) const;
+
+    /**
+     * not operator (invert)
+     */
+    IPv6Address operator~() const ;
 
 private:
     void init(const char* addr);
diff --git a/include/tins/network_interface.h b/include/tins/network_interface.h
index 678ad4d..365000c 100644
--- a/include/tins/network_interface.h
+++ b/include/tins/network_interface.h
@@ -118,6 +118,17 @@ public:
      * \param ip The ip address being looked up.
      */
     NetworkInterface(IPv4Address ip);
+
+
+    /**
+     * \brief Constructs a NetworkInterface from an ipv6 address.
+     *
+     * This abstracted interface will be the one that would be the gateway
+     * when sending a packet to the given ip.
+     *
+     * \param ip The ipv6 address being looked up.
+     */
+    NetworkInterface(IPv6Address ipv6);
     
     /**
      * \brief Getter for this interface's identifier.
diff --git a/include/tins/utils/routing_utils.h b/include/tins/utils/routing_utils.h
index 199f363..9852d7e 100644
--- a/include/tins/utils/routing_utils.h
+++ b/include/tins/utils/routing_utils.h
@@ -110,6 +110,14 @@ struct Route6Entry {
 template<typename ForwardIterator>
 void route_entries(ForwardIterator output);
 
+/**
+ * \brief Retrieves entries in the routing table.
+ *
+ * \brief output ForwardIterator in which entries will be stored.
+ */
+template<typename ForwardIterator>
+void route6_entries(ForwardIterator output);
+
 /**
  * \brief Retrieves entries in the routing table.
  * 
@@ -117,6 +125,7 @@ void route_entries(ForwardIterator output);
  */
 TINS_API std::vector<RouteEntry> route_entries();
 
+
 /**
  * \brief Retrieves entries in the routing table.
  * 
@@ -146,6 +155,19 @@ TINS_API std::set<std::string> network_interfaces();
  */
 TINS_API bool gateway_from_ip(IPv4Address ip, IPv4Address& gw_addr);
 
+/**
+ * \brief Finds the gateway's IP address for the given IP
+ * address.
+ *
+ * \param ip The IP address for which the default gateway will
+ * be searched.
+ * \param gw_addr This parameter will contain the gateway's IP
+ * address in case it is found.
+ *
+ * \return bool indicating whether the lookup was successfull.
+ */
+TINS_API bool gateway_from_ip(IPv6Address ip, IPv6Address& gw_addr);
+
 } // Utils
 } // Tins
 
@@ -158,4 +180,13 @@ void Tins::Utils::route_entries(ForwardIterator output) {
     }
 }
 
+template<typename ForwardIterator>
+void Tins::Utils::route6_entries(ForwardIterator output) {
+    std::vector<Route6Entry> entries = route6_entries();
+    for (size_t i = 0; i < entries.size(); ++i) {
+        *output = entries[i];
+        ++output;
+    }
+}
+
 #endif // TINS_ROUTING_UTILS_H
diff --git a/src/hw_address.cpp b/src/hw_address.cpp
index ce59d9a..9573f4b 100644
--- a/src/hw_address.cpp
+++ b/src/hw_address.cpp
@@ -113,5 +113,10 @@ bool hw_address_lt_compare(const uint8_t* start1, const uint8_t* end1,
     return lexicographical_compare(start1, end1, start2, end2);
 }
 
+bool hw_address_gt_compare(const uint8_t* start1, const uint8_t* end1,
+                           const uint8_t* start2, const uint8_t* end2) {
+    return lexicographical_compare(start2, end2, start1, end1);
+}
+
 } // Internals
 } // Tins
diff --git a/src/ip_address.cpp b/src/ip_address.cpp
index b5c2b23..a091429 100644
--- a/src/ip_address.cpp
+++ b/src/ip_address.cpp
@@ -153,4 +153,12 @@ IPv4Address IPv4Address::operator&(const IPv4Address& mask) const {
     return IPv4Address(Endian::be_to_host(ip_addr_ & mask.ip_addr_));
 }
 
+IPv4Address IPv4Address::operator|(const IPv4Address& mask) const {
+    return IPv4Address(Endian::be_to_host(ip_addr_ | mask.ip_addr_));
+}
+
+IPv4Address IPv4Address::operator~() const {
+    return IPv4Address(Endian::be_to_host(~ip_addr_));
+}
+
 } // Tins
diff --git a/src/ipv6_address.cpp b/src/ipv6_address.cpp
index b28ba4f..cd2d7a3 100644
--- a/src/ipv6_address.cpp
+++ b/src/ipv6_address.cpp
@@ -142,13 +142,33 @@ ostream& operator<<(ostream& os, const IPv6Address& addr) {
     return os << addr.to_string();
 }
 
-IPv6Address operator&(const IPv6Address& lhs, const IPv6Address& rhs) {
-    IPv6Address output = lhs;
-    IPv6Address::iterator addr_iter = output.begin();
+IPv6Address IPv6Address::operator&(const IPv6Address& rhs) const {
+    IPv6Address result = *this;
+    IPv6Address::iterator addr_iter = result.begin();
     for (IPv6Address::const_iterator it = rhs.begin(); it != rhs.end(); ++it, ++addr_iter) {
         *addr_iter = *addr_iter & *it;
     }
-    return output;
+
+    return result;
+}
+
+IPv6Address IPv6Address::operator|(const IPv6Address& rhs) const {
+     IPv6Address result = *this;
+    IPv6Address::iterator addr_iter = result.begin();
+    for (IPv6Address::const_iterator it = rhs.begin(); it != rhs.end(); ++it, ++addr_iter) {
+        *addr_iter = *addr_iter | *it;
+    }
+
+    return result;
+}
+
+IPv6Address IPv6Address::operator~() const {
+    IPv6Address result  = *this;
+    for (IPv6Address::iterator addr_iter = result.begin(); addr_iter != result.end(); ++addr_iter) {
+        *addr_iter = ~*addr_iter;
+    }
+
+   return result;
 }
 
 } // Tins
diff --git a/src/network_interface.cpp b/src/network_interface.cpp
index 6ab5220..f48e522 100644
--- a/src/network_interface.cpp
+++ b/src/network_interface.cpp
@@ -257,6 +257,35 @@ NetworkInterface::NetworkInterface(IPv4Address ip)
     }
 }
 
+NetworkInterface::NetworkInterface(IPv6Address ipv6)
+: iface_id_(0) {
+    typedef vector<Utils::Route6Entry> entries_type;
+
+    if (ipv6 == "::1") {
+        #if defined(BSD) || defined(__FreeBSD_kernel__)
+        iface_id_ = resolve_index("lo0");
+        #else
+        iface_id_ = resolve_index("lo");
+        #endif
+    }
+    else {
+        const Utils::Route6Entry* best_match = 0;
+        entries_type entries;
+        Utils::route6_entries(std::back_inserter(entries));
+        for (entries_type::const_iterator it(entries.begin()); it != entries.end(); ++it) {
+            if ((ipv6 & it->mask) == it->destination) {
+                if (!best_match || it->mask > best_match->mask || it->metric < best_match->metric) {
+                    best_match = &*it;
+                }
+            }
+        }
+        if (!best_match) {
+            throw invalid_interface();
+        }
+        iface_id_ = resolve_index(best_match->interface.c_str());
+    }
+}
+
 string NetworkInterface::name() const {
     #ifndef _WIN32
     char iface_name[IF_NAMESIZE];
diff --git a/src/utils/routing_utils.cpp b/src/utils/routing_utils.cpp
index a233bca..d107de8 100644
--- a/src/utils/routing_utils.cpp
+++ b/src/utils/routing_utils.cpp
@@ -439,5 +439,17 @@ bool gateway_from_ip(IPv4Address ip, IPv4Address& gw_addr) {
     return false;
 }
 
+bool gateway_from_ip(IPv6Address ip, IPv6Address& gw_addr) {
+    typedef vector<Route6Entry> entries_type;
+    entries_type entries =route6_entries();
+    for (entries_type::const_iterator it(entries.begin()); it != entries.end(); ++it) {
+        if ((ip & it->mask) == it->destination) {
+            gw_addr = it->gateway;
+            return true;
+        }
+    }
+    return false;
+}
+
 } // Utils
 } // Tins
diff --git a/tests/src/hw_address_test.cpp b/tests/src/hw_address_test.cpp
index 86b82cd..d924430 100644
--- a/tests/src/hw_address_test.cpp
+++ b/tests/src/hw_address_test.cpp
@@ -52,6 +52,7 @@ TEST_F(HWAddressTest, LessThanOperator) {
     HWAddress<6> bcast = "ff:ff:ff:ff:ff:ff";
     EXPECT_LT(addr2, addr1);
     EXPECT_LT(addr2, bcast);
+    EXPECT_LE(addr1, addr1);
     std::map<HWAddress<6>, int> dict;
     dict[addr1] = 12;
     dict[addr2] = 15;
@@ -59,6 +60,20 @@ TEST_F(HWAddressTest, LessThanOperator) {
     EXPECT_EQ(dict[addr2], 15);
 }
 
+TEST_F(HWAddressTest, GreaterThanOperator) {
+    HWAddress<6> addr1(byte_address), addr2(empty_addr);
+    HWAddress<6> bcast = "ff:ff:ff:ff:ff:ff";
+    EXPECT_GT(addr1, addr2);
+    EXPECT_GT(bcast, addr2);
+    EXPECT_GE(addr1, addr1);
+    std::map<HWAddress<6>, int> dict;
+    dict[addr1] = 12;
+    dict[addr2] = 15;
+    EXPECT_EQ(dict[addr1], 12);
+    EXPECT_EQ(dict[addr2], 15);
+}
+
+
 
 TEST_F(HWAddressTest, CopyConstructor) {
     HWAddress<6> addr1(byte_address), addr2(addr1);
@@ -115,3 +130,18 @@ TEST_F(HWAddressTest, Mask) {
         address_type("de:ad:be:ef:00:00") & address_type("ff:ff:ff:f0:00:00")
     );
 }
+
+TEST_F(HWAddressTest, OrMask) {
+    typedef HWAddress<6> address_type;
+    EXPECT_EQ(
+        address_type("ff:ff:ff:ff:fe:be"),
+        address_type("de:ad:be:ef:fe:be") | address_type("ff:ff:ff:f0:00:00")
+    );
+}
+
+TEST_F(HWAddressTest, NotMask) {
+    typedef HWAddress<6> address_type;
+    EXPECT_EQ(
+        address_type("00:00:00:0f:ff:ff"), ~address_type("ff:ff:ff:f0:00:00")
+    );
+}
diff --git a/tests/src/ip_address_test.cpp b/tests/src/ip_address_test.cpp
index 2be5701..db68666 100644
--- a/tests/src/ip_address_test.cpp
+++ b/tests/src/ip_address_test.cpp
@@ -47,8 +47,19 @@ TEST(IPAddressTest, LessThanOperator) {
     EXPECT_LT(addr1, "192.168.1.2");
     EXPECT_LT(addr1, "192.168.0.226");
     EXPECT_LT(addr1, "193.0.0.0");
+    EXPECT_LE(addr1, addr2);
 }
 
+TEST(IPAddressTest, GreaterThanOperator) {
+    IPv4Address addr1(ip_string), addr2(ip_string);
+    EXPECT_FALSE(addr1 < addr2);
+    EXPECT_GT(addr1, "192.167.1.2");
+    EXPECT_GT(addr1, "192.167.0.226");
+    EXPECT_GT(addr1, "191.0.0.0");
+    EXPECT_GE(addr1, addr2);
+}
+
+
 TEST(IPAddressTest, IsPrivate) {
     EXPECT_TRUE(IPv4Address("192.168.0.1").is_private());
     EXPECT_TRUE(IPv4Address("192.168.133.7").is_private());
@@ -112,6 +123,26 @@ TEST(IPAddressTest, Mask) {
     );
 }
 
+TEST(IPAddressTest, OrMask) {
+    EXPECT_EQ(
+        IPv4Address("255.255.255.1"),
+        IPv4Address("192.168.100.1") | IPv4Address("255.255.255.0")
+    );
+    EXPECT_EQ(
+        IPv4Address("255.255.1.2"),
+        IPv4Address("192.255.1.2") | IPv4Address("255.128.0.0")
+    );
+}
+
+TEST(IPAddressTest, NotMask) {
+    EXPECT_EQ(
+        IPv4Address("0.0.0.255"), ~IPv4Address("255.255.255.0")
+    );
+    EXPECT_EQ(
+        IPv4Address("0.127.255.255"),~IPv4Address("255.128.0.0")
+    );
+}
+
 TEST(IPv4AddressTest, Size) {
     EXPECT_EQ(4UL, IPv4Address("127.0.0.1").size());
     EXPECT_EQ(4UL, IPv4Address().size());
diff --git a/tests/src/ipv6_address_test.cpp b/tests/src/ipv6_address_test.cpp
index 5f8fa16..92d4791 100644
--- a/tests/src/ipv6_address_test.cpp
+++ b/tests/src/ipv6_address_test.cpp
@@ -70,6 +70,14 @@ TEST(IPv6AddressTest, LessThanOperator) {
     EXPECT_LT(IPv6Address("17f8::1"), IPv6Address("17f8:0::0:5"));
     EXPECT_LT(IPv6Address("::1"), IPv6Address("::5"));
     EXPECT_LT(IPv6Address("1::"), IPv6Address("2::"));
+    EXPECT_LE(IPv6Address("1::"), IPv6Address("1::"));
+}
+
+TEST(IPv6AddressTest, GreaterThanOperator) {
+    EXPECT_GT(IPv6Address("17f8:0::0:5"), IPv6Address("17f8::1"));
+    EXPECT_GT(IPv6Address("::5"), IPv6Address("::1"));
+    EXPECT_GT(IPv6Address("2::"), IPv6Address("1::"));
+    EXPECT_GE(IPv6Address("2::"), IPv6Address("2::"));
 }
 
 TEST(IPv6AddressTest, OutputOperator) {
@@ -124,6 +132,33 @@ TEST(IPv6AddressTest, MaskAddress) {
     );
 }
 
+
+TEST(IPv6AddressTest, OrMaskAddress) {
+    EXPECT_EQ(
+        IPv6Address("ffff:ffff:adad:beef::"),
+        IPv6Address("deaf:beef:adad:beef::") | IPv6Address("ffff:ffff::")
+    );
+    EXPECT_EQ(
+        IPv6Address("ffff:ffef:adad:beef::"),
+        IPv6Address("deaf:beef:adad:beef::") | IPv6Address("ffff:ff00::")
+    );
+    EXPECT_EQ(
+        IPv6Address("ffff:feef:adad:beef::"),
+        IPv6Address("deaf:beef:adad:beef::") | IPv6Address("ffff:f000::")
+    );
+    EXPECT_EQ(
+        IPv6Address("ffff:feef:adad:beef::"),
+        IPv6Address("deaf:beef:adad:beef::") | IPv6Address("ffff:e000::")
+    );
+}
+
+TEST(IPv6AddressTest, NotMaskAddress) {
+    EXPECT_EQ(IPv6Address("::ffff:ffff:ffff:ffff:ffff:ffff"),~IPv6Address("ffff:ffff::"));
+    EXPECT_EQ(IPv6Address("::ff:ffff:ffff:ffff:ffff:ffff"),~IPv6Address("ffff:ffff:ff00::"));
+    EXPECT_EQ(IPv6Address("::fff:ffff:ffff:ffff:ffff:ffff"),~IPv6Address("ffff:ffff:f000::"));
+    EXPECT_EQ(IPv6Address("::1fff:ffff:ffff:ffff:ffff:ffff"),~IPv6Address("ffff:ffff:e000::"));
+}
+
 TEST(IPv6AddressTest, Size) {
     EXPECT_EQ(16UL, IPv6Address("dead:beef::1").size());
     EXPECT_EQ(16UL, IPv6Address().size());
diff --git a/tests/src/network_interface_test.cpp b/tests/src/network_interface_test.cpp
index ee0f21f..84b7e16 100644
--- a/tests/src/network_interface_test.cpp
+++ b/tests/src/network_interface_test.cpp
@@ -37,6 +37,8 @@ TEST_F(NetworkInterfaceTest, ConstructorFromString) {
 TEST_F(NetworkInterfaceTest, ConstructorFromIp) {
     NetworkInterface iface(IPv4Address("127.0.0.1"));
     EXPECT_EQ(iface.name(), iface_name);
+    NetworkInterface i6face(IPv6Address("::1"));
+    EXPECT_EQ(i6face.name(), iface_name);
 }
 
 TEST_F(NetworkInterfaceTest, Id) {