Update script for dynv6.com to set your IPv4 address and IPv6 prefix. works with only one devices MAC-adress. Use it as cronjob to automate updates.

dynv6-windows.vbs

mydnv6token = "auth-token"
mydnv6hostname = "username.dynv6.net"
' MAC adress of desired device
searchingFor = "20:CF:30:09:F3:80"


Dim myIP4Address : myIP4Address = ""
Dim myIP6Address : myIP6Address = ""
Dim objWMIService : Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\.\root\cimv2")

Dim colAdapters : Set colAdapters = objWMIService.ExecQuery("Select * from Win32_NetworkAdapterConfiguration Where IPEnabled = True")
Dim objAdapter
For Each objAdapter in colAdapters
  If StrComp(objAdapter.MACAddress,searchingFor,1)=0 and Not IsNull(objAdapter.IPAddress) Then myIP4Address = trim(objAdapter.IPAddress(0)) : myIP6Address = trim(objAdapter.IPAddress(3))
Next

' testing stuff
'Wscript.echo "My IP4Address is " & myIP4Address  
'Wscript.echo "My IP6Address is " & myIP6Address 
'Wscript.echo "http://ipv4.dynv6.com/api/update?hostname=" & mydnv6hostname & "&ipv4=" & myIP4Address & "&token=" & mydnv6token

dim xHttp: Set xHttp = createobject("MSXML2.ServerXMLHTTP")

xHttp.Open "GET", "http://ipv4.dynv6.com/api/update?hostname=" & mydnv6hostname & "&ipv4=" & myIP4Address & "&token=" & mydnv6token, False

' 2 stands for SXH_OPTION_IGNORE_SERVER_SSL_CERT_ERROR_FLAGS
' 13056 means ignore all server side cert error
xHttp.setOption 2, 13056
xHttp.Send

xHttp.Open "GET", "http://dynv6.com/api/update?hostname=" & mydnv6hostname & "&ipv6=" & myIP6Address & "&token=" & mydnv6token, False

xHttp.setOption 2, 13056
xHttp.Send