diff --git a/README.md b/README.md
index 8a717d2..5fadfe7 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,8 @@ The following rules apply:
 * use any IP address provided via the X-Real-IP header e.g. when used behind HTTP reverse proxy such as nginx, or
 * use any IP address used by the connecting HTTP client
 
+If you want to provide an additional IPv6 address as myip6 parameter the myip parameter containing an IPv4 address has to be present, too! No automatism is applied then.
+
 ### SSL, multiple listen ports
 
 Use a webserver as a proxy to handle SSL and/or multiple listen addresses and ports. DynDNS.com provides HTTP on port 80 and 8245 and HTTPS on port 443.
diff --git a/lib/dyndnsd.rb b/lib/dyndnsd.rb
index c836aea..199b52a 100644
--- a/lib/dyndnsd.rb
+++ b/lib/dyndnsd.rb
@@ -78,24 +78,40 @@ module Dyndnsd
         return @responder.response_for_error(:host_forbidden) if not @users[user]['hosts'].include? hostname
       end
 
-      # fallback value, always present
-      myip = env["REMOTE_ADDR"]
+      myip = nil
 
-      # check whether X-Real-IP header has valid IPAddr
-      if env.has_key?("HTTP_X_REAL_IP")
+      if params.has_key?("myip6")
+        # require presence of myip parameter as valid IPAddr (v4) and valid myip6
+        return @responder.response_for_error(:host_forbidden) if not params["myip"]
         begin
-          IPAddr.new(env["HTTP_X_REAL_IP"])
-          myip = env["HTTP_X_REAL_IP"]
+          IPAddr.new(params["myip"], Socket::AF_INET)
+          IPAddr.new(params["myip6"], Socket::AF_INET6)
+          
+          # myip will be an array
+          myip = [params["myip"], params["myip6"]]
         rescue ArgumentError
+          return @responder.response_for_error(:host_forbidden)
         end
-      end
+      else
+        # fallback value, always present
+        myip = env["REMOTE_ADDR"]
 
-      # check whether myip parameter has valid IPAddr
-      if params.has_key?("myip")
-        begin
-          IPAddr.new(params["myip"])
-          myip = params["myip"]
-        rescue ArgumentError
+        # check whether X-Real-IP header has valid IPAddr
+        if env.has_key?("HTTP_X_REAL_IP")
+          begin
+            IPAddr.new(env["HTTP_X_REAL_IP"])
+            myip = env["HTTP_X_REAL_IP"]
+          rescue ArgumentError
+          end
+        end
+
+        # check whether myip parameter has valid IPAddr
+        if params.has_key?("myip")
+          begin
+            IPAddr.new(params["myip"])
+            myip = params["myip"]
+          rescue ArgumentError
+          end
         end
       end
 
diff --git a/lib/dyndnsd/generator/bind.rb b/lib/dyndnsd/generator/bind.rb
index 3d03e06..44b8f3d 100644
--- a/lib/dyndnsd/generator/bind.rb
+++ b/lib/dyndnsd/generator/bind.rb
@@ -18,11 +18,13 @@ module Dyndnsd
         out << "@ IN SOA #{@dns} #{@email_addr} ( #{zone['serial']} 3h 5m 1w 1h )"
         out << "@ IN NS #{@dns}"
         out << ""
-        zone['hosts'].each do |hostname,ip|
-          ip = IPAddr.new(ip).native
-          type = ip.ipv6? ? "AAAA" : "A"
-          name = hostname.chomp('.' + @domain)
-          out << "#{name} IN #{type} #{ip}"
+        zone['hosts'].each do |hostname,ips|
+          (ips.is_a?(Array) ? ips : [ips]).each do |ip|
+            ip = IPAddr.new(ip).native
+            type = ip.ipv6? ? "AAAA" : "A"
+            name = hostname.chomp('.' + @domain)
+            out << "#{name} IN #{type} #{ip}"
+          end
         end
         out << ""
         out << @additional_zone_content
diff --git a/lib/dyndnsd/responder/dyndns_style.rb b/lib/dyndnsd/responder/dyndns_style.rb
index 2bef220..106f75a 100644
--- a/lib/dyndnsd/responder/dyndns_style.rb
+++ b/lib/dyndnsd/responder/dyndns_style.rb
@@ -11,9 +11,9 @@ module Dyndnsd
         return [200, {"Content-Type" => "text/plain"}, ["nohost"]] if state == :host_forbidden
         return [200, {"Content-Type" => "text/plain"}, ["notfqdn"]] if state == :hostname_malformed
       end
-      
+
       def response_for_changes(states, ip)
-        body = states.map { |state| "#{state} #{ip}" }.join("\n")
+        body = states.map { |state| "#{state} #{ip.is_a?(Array) ? ip.join(' ') : ip}" }.join("\n")
         return [200, {"Content-Type" => "text/plain"}, [body]]
       end
     end
diff --git a/lib/dyndnsd/responder/rest_style.rb b/lib/dyndnsd/responder/rest_style.rb
index f349a61..681e5e0 100644
--- a/lib/dyndnsd/responder/rest_style.rb
+++ b/lib/dyndnsd/responder/rest_style.rb
@@ -11,9 +11,9 @@ module Dyndnsd
         return [403, {"Content-Type" => "text/plain"}, ["Forbidden"]] if state == :host_forbidden
         return [422, {"Content-Type" => "text/plain"}, ["Hostname malformed"]] if state == :hostname_malformed
       end
-      
+
       def response_for_changes(states, ip)
-        body = states.map { |state| state == :good ? "Changed to #{ip}" : "No change needed for #{ip}" }.join("\n")
+        body = states.map { |state| state == :good ? "Changed to #{ip.is_a?(Array) ? ip.join(' ') : ip}" : "No change needed for #{ip.is_a?(Array) ? ip.join(' ') : ip}" }.join("\n")
         return [200, {"Content-Type" => "text/plain"}, [body]]
       end
     end
diff --git a/spec/daemon_spec.rb b/spec/daemon_spec.rb
index 15db4ae..ba79ff5 100644
--- a/spec/daemon_spec.rb
+++ b/spec/daemon_spec.rb
@@ -170,8 +170,37 @@ describe Dyndnsd::Daemon do
 
   it 'uses clients remote IP address from X-Real-IP header if behind proxy' do
     authorize 'test', 'secret'
+
     get '/nic/update?hostname=foo.example.org', '', 'HTTP_X_REAL_IP' => '10.0.0.1'
     expect(last_response).to be_ok
     expect(last_response.body).to eq('good 10.0.0.1')
+
+    get '/nic/update?hostname=foo.example.org', '', 'HTTP_X_REAL_IP' => '2001:db8::1'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('good 2001:db8::1')
+  end
+
+  it 'supports an IPv4 and an IPv6 address in one request' do
+    authorize 'test', 'secret'
+
+    get '/nic/update?hostname=foo.example.org&myip=1.2.3.4&myip6=2001:db8::1'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq("good 1.2.3.4 2001:db8::1")
+
+    get '/nic/update?hostname=foo.example.org&myip=BROKENIP&myip6=2001:db8::1'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('nohost')
+
+    get '/nic/update?hostname=foo.example.org&myip=1.2.3.4&myip6=BROKENIP'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('nohost')
+
+    get '/nic/update?hostname=foo.example.org&myip6=2001:db8::10'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('nohost')
+
+    get '/nic/update?hostname=foo.example.org&myip=1.2.3.40'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('good 1.2.3.40')
   end
 end