diff --git a/lib/vagrant/util/network_ip.rb b/lib/vagrant/util/network_ip.rb
index fca98f8b4..5f22f69d4 100644
--- a/lib/vagrant/util/network_ip.rb
+++ b/lib/vagrant/util/network_ip.rb
@@ -1,10 +1,21 @@
+require "ipaddr"
+
 module Vagrant
   module Util
     module NetworkIP
       # Returns the network address of the given IP and subnet.
       #
+      # If the IP address is an IPv6 address, subnet should be a prefix
+      # length such as "64".
+      #
       # @return [String]
       def network_address(ip, subnet)
+        # If this is an IPv6 address, then just mask it
+        if subnet.to_s =~ /^\d+$/
+          ip = IPAddr.new(ip)
+          return ip.mask(subnet.to_i).to_s
+        end
+
         ip      = ip_parts(ip)
         netmask = ip_parts(subnet)
 
diff --git a/plugins/providers/virtualbox/action/network.rb b/plugins/providers/virtualbox/action/network.rb
index 3697cdfef..881fcdf51 100644
--- a/plugins/providers/virtualbox/action/network.rb
+++ b/plugins/providers/virtualbox/action/network.rb
@@ -1,3 +1,4 @@
+require "ipaddr"
 require "set"
 
 require "log4r"
@@ -248,7 +249,6 @@ module VagrantPlugins
             auto_config: true,
             mac:         nil,
             nic_type:    nil,
-            netmask:     "255.255.255.0",
             type:        :static
           }.merge(options)
 
@@ -258,31 +258,45 @@ module VagrantPlugins
           # Default IP is in the 20-bit private network block for DHCP based networks
           options[:ip] = "172.28.128.1" if options[:type] == :dhcp && !options[:ip]
 
-          # Calculate our network address for the given IP/netmask
-          netaddr  = network_address(options[:ip], options[:netmask])
+          ip = IPAddr.new(options[:ip])
+          if !ip.ipv6?
+            options[:netmask] ||= "255.255.255.0"
 
-          # Verify that a host-only network subnet would not collide
-          # with a bridged networking interface.
-          #
-          # If the subnets overlap in any way then the host only network
-          # will not work because the routing tables will force the
-          # traffic onto the real interface rather than the VirtualBox
-          # interface.
-          @env[:machine].provider.driver.read_bridged_interfaces.each do |interface|
-            that_netaddr = network_address(interface[:ip], interface[:netmask])
-            raise Vagrant::Errors::NetworkCollision if \
-              netaddr == that_netaddr && interface[:status] != "Down"
+            # Calculate our network address for the given IP/netmask
+            netaddr  = network_address(options[:ip], options[:netmask])
+
+            # Verify that a host-only network subnet would not collide
+            # with a bridged networking interface.
+            #
+            # If the subnets overlap in any way then the host only network
+            # will not work because the routing tables will force the
+            # traffic onto the real interface rather than the VirtualBox
+            # interface.
+            @env[:machine].provider.driver.read_bridged_interfaces.each do |interface|
+              that_netaddr = network_address(interface[:ip], interface[:netmask])
+              raise Vagrant::Errors::NetworkCollision if \
+                netaddr == that_netaddr && interface[:status] != "Down"
+            end
+
+            # Split the IP address into its components
+            ip_parts = netaddr.split(".").map { |i| i.to_i }
+
+            # Calculate the adapter IP, which we assume is the IP ".1" at
+            # the end usually.
+            adapter_ip    = ip_parts.dup
+            adapter_ip[3] += 1
+            options[:adapter_ip] ||= adapter_ip.join(".")
+          else
+            # Default subnet prefix length
+            options[:netmask] ||= 64
+
+            # IPv6 we just mask the address and use that as the adapter
+            options[:adapter_ip] ||= ip.mask(options[:netmask].to_i).to_s
+
+            # Append a 6 to the end of the type
+            options[:type] = "#{options[:type]}6".to_sym
           end
 
-          # Split the IP address into its components
-          ip_parts = netaddr.split(".").map { |i| i.to_i }
-
-          # Calculate the adapter IP, which we assume is the IP ".1" at
-          # the end usually.
-          adapter_ip    = ip_parts.dup
-          adapter_ip[3] += 1
-          options[:adapter_ip] ||= adapter_ip.join(".")
-
           dhcp_options = {}
           if options[:type] == :dhcp
             # Calculate the DHCP server IP, which is the network address
@@ -456,8 +470,16 @@ module VagrantPlugins
 
           @env[:machine].provider.driver.read_host_only_interfaces.each do |interface|
             return interface if config[:name] && config[:name] == interface[:name]
-            return interface if this_netaddr == \
-              network_address(interface[:ip], interface[:netmask])
+
+            if interface[:ip] != ""
+              return interface if this_netaddr == \
+                network_address(interface[:ip], interface[:netmask])
+            end
+
+            if interface[:ipv6] != ""
+              return interface if this_netaddr == \
+                network_address(interface[:ipv6], interface[:ipv6_prefix])
+            end
           end
 
           nil
diff --git a/plugins/providers/virtualbox/driver/version_4_3.rb b/plugins/providers/virtualbox/driver/version_4_3.rb
index b421e7911..ed4b7aa9e 100644
--- a/plugins/providers/virtualbox/driver/version_4_3.rb
+++ b/plugins/providers/virtualbox/driver/version_4_3.rb
@@ -1,3 +1,4 @@
+require 'ipaddr'
 require 'log4r'
 
 require "vagrant/util/platform"
@@ -46,12 +47,21 @@ module VagrantPlugins
         def create_host_only_network(options)
           # Create the interface
           execute("hostonlyif", "create") =~ /^Interface '(.+?)' was successfully created$/
-            name = $1.to_s
+          name = $1.to_s
 
-          # Configure it
-          execute("hostonlyif", "ipconfig", name,
-                  "--ip", options[:adapter_ip],
-                  "--netmask", options[:netmask])
+          # Get the IP so we can determine v4 vs v6
+          ip = IPAddr.new(options[:adapter_ip])
+
+          # Configure
+          if ip.ipv4?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ip", options[:adapter_ip],
+                    "--netmask", options[:netmask])
+          elsif ip.ipv6?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ipv6", options[:adapter_ip],
+                    "--netmasklengthv6", options[:netmask])
+          end
 
           # Return the details
           return {
@@ -366,6 +376,10 @@ module VagrantPlugins
                 info[:ip] = $1.to_s
               elsif line =~ /^NetworkMask:\s+(.+?)$/
                 info[:netmask] = $1.to_s
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s.strip
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s.strip
               elsif line =~ /^Status:\s+(.+?)$/
                 info[:status] = $1.to_s
               end
diff --git a/plugins/providers/virtualbox/driver/version_5_0.rb b/plugins/providers/virtualbox/driver/version_5_0.rb
index 102d838bc..c8d659e11 100644
--- a/plugins/providers/virtualbox/driver/version_5_0.rb
+++ b/plugins/providers/virtualbox/driver/version_5_0.rb
@@ -366,6 +366,10 @@ module VagrantPlugins
                 info[:ip] = $1.to_s
               elsif line =~ /^NetworkMask:\s+(.+?)$/
                 info[:netmask] = $1.to_s
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s
               elsif line =~ /^Status:\s+(.+?)$/
                 info[:status] = $1.to_s
               end
diff --git a/templates/guests/debian/network_static6.erb b/templates/guests/debian/network_static6.erb
new file mode 100644
index 000000000..7b9e8a694
--- /dev/null
+++ b/templates/guests/debian/network_static6.erb
@@ -0,0 +1,10 @@
+#VAGRANT-BEGIN
+# The contents below are automatically generated by Vagrant. Do not modify.
+auto eth<%= options[:interface] %>
+iface eth<%= options[:interface] %> inet6 static
+      address <%= options[:ip] %>
+      netmask <%= options[:netmask] %>
+<% if options[:gateway] %>
+      gateway <%= options[:gateway] %>
+<% end %>
+#VAGRANT-END
diff --git a/test/unit/vagrant/util/network_ip_test.rb b/test/unit/vagrant/util/network_ip_test.rb
index a4ff8944c..9d0d09b12 100644
--- a/test/unit/vagrant/util/network_ip_test.rb
+++ b/test/unit/vagrant/util/network_ip_test.rb
@@ -13,5 +13,17 @@ describe Vagrant::Util::NetworkIP do
     it "calculates it properly" do
       expect(klass.network_address("192.168.2.234", "255.255.255.0")).to eq("192.168.2.0")
     end
+
+    it "calculates it properly with integer submask" do
+      expect(klass.network_address("192.168.2.234", "24")).to eq("192.168.2.0")
+    end
+
+    it "calculates it properly for IPv6" do
+      expect(klass.network_address("fde4:8dba:82e1::c4", "64")).to eq("fde4:8dba:82e1::")
+    end
+
+    it "calculates it properly for IPv6" do
+      expect(klass.network_address("fde4:8dba:82e1::c4", 64)).to eq("fde4:8dba:82e1::")
+    end
   end
 end