Duiadns is not just another free dynamic dns provider. The concept was born to solve the big issue of ipv6 dynamic allocation. You probably know that with ipv6, you'll get a public ipv6 address on every single device of your home network (LAN), rather it is a pc, a laptop, a smartphone, a printer, a sensor or a fridge. But how can you access the sensor for example, if you don't know its ipv6 address and the sensor itself cannot run a dynamic dns client? Some very experienced network engineers and programmers addressed this issue and solve it and this is how duiadns was born.