QNAP NAS (Network Attached Storage) has a 'Customized' option that you can use to configure Dynu's free dynamic DNS service.
Select DDNS server: Customized
Profile Name: Dynu Free Dynamic DNS Service or any other name you want to use
Username: enter your Dynu username, which could be found in Contact Details in the control panel.
Password: enter your Dynu password or IP update password.
MD5
or SHA256
of the password is also accepted on our server side.
Hostname: enter your hostname, for example, example.dynu.com or example.com
Check the external IP address automatically: 30 Minutes
URL: https://api.dynu.com/nic/update?hostname=%HOST%&username=%USER%&password=%PASS%&myip=%IP%
NOTE: We have feedback from users that you will need to port forward port 8080 to the Qnap NAS or the web comunication port that you have setup in the NAS settings.

NOTE: We have feedback from users that you will need to port forward port 8080 to the Qnap NAS or the web comunication port that you have setup in the NAS settings.
Custom
A1 Hybrid Box
Apple Airport
Arris
Bintec
BT Smart Hub
Cisco Router
DD-WRT
Dovado
DrayTek
E-Lins
HUAWEI HG 533/520v
HG8245/8045/8346M
FreeNAS
Fritzbox
Maxis TP-LINK AC1200
Mikrotik
Open Wrt
OPNsense
pfSense
pfSense (IPv6)
QNAP
Raspberry Pi
Synology NAS
Technicolor TG582n
TELTONIKA
Thomson TG585v7
Tomato USB
TP-Link ER605
TrueNAS
Ubiquiti EdgeRouter
Windtre
ZTE
ZyWALL-USG50
Zyxel 5501
Zyxel-C1100Z