Both TCP and HTTP based GnuDIP is fully supported. Routers supporting GnuDIP IP update as well as any GnuDIP based IP update clients may be used to make full use of this functionality.

GnuDIP TCP Server: gnudip.dynu.com
GnuDIP TCP Port: 3495

GnuDIP HTTP URL: http://gnudip.dynu.com/gnudip/cgi-bin/gdipupdt.cgi
GnuDIP HTTP Ports: 80, 8245
One example of the use of HTTP based GnuDip is HUAWEI HG533 router, you may refer to this page for configuration for HUAWEI HG533 router .

If you still have questions on the configuration, contact support with the screenshot of the Dynamic DNS section of your device with GnuDIP option.