Overview
UniFi DDNS is a Cloudflare Worker that lets UniFi gateways (such as the UDM-Pro or USG) keep Cloudflare DNS records pointed at your current public IP. Your UniFi device calls the Worker using its built-in “custom” Dynamic DNS provider, and the Worker updates the A/AAAA records through the Cloudflare API.
Recent UniFi Network releases (9.1.92+) include native Cloudflare DDNS, but this Worker is still useful for older firmware and for features the native option lacks: updating multiple hostnames, dual-stack IPv4 + IPv6, and preserving each record’s proxy status.
Key Features
- Works with UniFi’s built-in custom DDNS — no scripts on the router
- IPv4 and IPv6 (A and AAAA records)
- Multiple hostnames per update
- Keeps the proxied/DNS-only setting of existing records
- Runs on the Workers free tier
Getting Started
1. Deploy the Worker
Use the “Deploy to Cloudflare” button, or deploy with Wrangler:
npm i
wrangler login
wrangler deployNote the *.workers.dev hostname it gives you.
2. Create an API token
In the Cloudflare dashboard, create a user API token from the “Edit zone DNS” template and scope it to a single zone.
3. Configure UniFi OS
Under Settings → Internet → WAN → Dynamic DNS, add a new entry:
| Field | Value |
|---|---|
| Service | custom |
| Hostname | home.example.com |
| Username | Your Cloudflare account email |
| Password | The API token from step 2 |
| Server | your-worker.workers.dev/update?ip=%i&hostname=%h (without https://) |
Use Cases
- Keeping a home or office domain pointed at a dynamic residential IP
- Dual-stack DDNS for homelabs with IPv6
- Updating several hostnames from one UniFi gateway
License
MIT License.
