FAQ
FastDDNS FAQ
Answers to the most important questions about setup, device compatibility, hostname updates, CGNAT, port forwarding, and plan limits.
26 common questions
FastDDNS is a free Dynamic DNS (DDNS) service that gives you a fixed hostname to remotely access your devices without needing a static IP address.
Your device automatically sends its current public IP to the FastDDNS server. When your IP changes, the hostname updates in under 60 seconds — keeping remote access uninterrupted.
No. FastDDNS is designed for dynamic IP connections, which are standard on most home and small business internet plans. A static IP is not required.
No. If all your devices go through the same modem and share the same public IP, one hostname is enough. Creating multiple hostnames for the same public IP wastes your hostname quota and may trigger abuse detection on the server side due to repeated updates coming from the same IP. Use one hostname per modem, then differentiate devices by port number.
Yes. The free plan includes 1 permanent hostname (renewed annually) and unlimited temporary hostnames active for 30 days each. No ads on the website, no credit card required.
The free plan gives you 1 permanent hostname that requires annual renewal. Paid plans (from $20/year) raise the hostname limit to 20–120, keep hostnames active for as long as the plan is valid, and add priority support via email and Telegram.
The most common uses are: remote CCTV camera access, NVR and DVR remote viewing, remote desktop access, self-hosted home servers, and game servers.
FastDDNS supports 50+ brands including Hikvision, Dahua, EZVIZ, KBVision, Imou, Uniview, Tiandy, HiLook, Reolink, and Xiongmai.
Yes, with limitations. FastDDNS supports MikroTik, pfSense, DrayTek, Synology NAS, Ubiquiti, Home Assistant, Windows, Ubuntu Linux, and Raspberry Pi. Some devices require manual configuration.
Typically under 60 seconds after the update request is sent. Some networks may take a few extra minutes due to local DNS cache.
Choose one of three methods: configure DDNS directly in your camera, NVR, or router settings; or install the FastDDNS update client on Windows or Linux if your device cannot send updates on its own.
Yes, if you want to access your device from the internet. DDNS only solves the changing IP problem — you still need to forward the correct ports on your router (for example, port 554 for RTSP or 37777 for Dahua cameras).
No. If your ISP uses Carrier-Grade NAT (CGNAT), you do not have a real public IP and inbound connections from the internet will be blocked. You can check this using the CGNAT Checker tool in the FastDDNS mobile app.
Open Network settings on your recorder, go to the DDNS section, select DynDNS mode or custom server, then enter your FastDDNS server address, hostname, username, and password. Save and confirm the connection status directly in the recorder interface.
No. Hostnames cannot be renamed after creation. If you need a different name, create a new hostname and update the DDNS settings on your device.
Yes. The permanent free hostname requires annual renewal. Temporary free hostnames expire after 30 days. Paid-plan hostnames need no separate renewal — they stay active for as long as the paid plan is valid.
No-IP free requires manual email confirmation every 30 days — missing one disables your hostname. FastDDNS free only requires renewal once a year. Paid plans also cost less: from $20/year versus No-IP at $29.99/year.
Nothing is lost. When your connection comes back online, your device automatically sends the new IP to FastDDNS and the hostname continues working normally.
Yes, though you usually need fewer hostnames than you think. A hostname points at one public IP address, so every camera, NVR and server behind the same modem is already reachable through a single hostname — you tell them apart by port number, or by a reverse proxy. Create a separate hostname when a device sits on a different internet connection and therefore a different public IP, or when the device's own configuration or your admin workflow genuinely calls for one. Free accounts support unlimited temporary hostnames; paid plans hold 20 to 120 permanent hostnames depending on the tier.
Yes, for both Android and iOS. The app lets you create and manage hostnames, receive alerts when your IP changes or a hostname is about to expire, and access built-in network tools including Port Checker, Ping, DNS Lookup, and LAN Scanner.
It tests whether a specific port on your device is open and reachable from the internet. This helps you identify whether a remote access failure is caused by a DNS issue or a port forwarding problem.
Hostnames follow the format your-name.fastddns.org, your-name.pingddns.com, or your-name.homeip.vn. The prefix is chosen by you during registration.
FastDDNS provides the hostname, not the SSL certificate. To use HTTPS, you need to configure SSL (for example via Let's Encrypt) and a reverse proxy on your own server or device.
Yes, within one limit worth knowing. FastDDNS uses the standard DynDNS-compatible HTTP update protocol, so any client that can speak DynDNS is able to update a FastDDNS hostname. What decides compatibility in practice is the firmware: it has to let you point the DDNS provider at a custom server address — or enter a custom update URL — and supply your FastDDNS username and password. Devices whose firmware offers only a fixed list of providers cannot be redirected to FastDDNS unless the manufacturer adds that option.
Yes. You can earn commission by referring new users. Manage your referral link in the Referral Program section after signing into your account.
Three steps: (1) Sign up for a free account at fastddns.net — no credit card needed; (2) Create a hostname and configure it on your camera, recorder, or install the update client; (3) Access your device remotely via hostname at any time, even when your IP changes. Setup takes under 5 minutes.