QNAP Security NVR-101 (Version: 2.8.0) - Manual (Page 88)

Appendix C Dynamic Domain Name Registration
NVR supports DDNS service provided by DynDNS. You can go to DynDNS
website
http://www.dyndns.org/ to register a dynamic domain name.
Configure and activate DDNS service to enable the Internet users to access your
NVR via this dynamic domain name. When the ISP assigns a new WAN IP address,
NVR will update the new address to the DynDNS server automatically.
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