Your Device.
Always Reachable.
Keep your NVR, firewall, or any internet-connected device accessible with a permanent hostname — even when your IP changes.
Free Hostnames
Get a permanent yourdevice.greatddns.com hostname at no cost. No subscriptions, no expiry.
Fast DNS Updates
60-second TTL ensures your hostname resolves to your new IP within minutes of any change.
Uptime Monitoring
Opt-in email alerts when your device stops checking in. Know the moment it goes offline.
Token-Based Auth
Each device gets a unique API token. One-line curl script — no credentials stored on device.
Built for NVRs
Perfect for Hikvision, Dahua, Reolink, and any camera system with a DDNS client or scheduler.
pfSense Ready
One-line cron job compatible with pfSense, OPNsense, and any Linux/Unix-based firewall.
One Line. That's It.
Update your hostname from any device that can run
curl —
a pfSense firewall, a Linux server, an NVR scheduler, or a Raspberry Pi cron job.
curl "https://greatddns.com/update/?token=YOUR_DEVICE_TOKEN"
Your device token is generated automatically when you add a device. No credentials stored on the device — ever.
How It Works
Create an Account
Free signup with email verification. No credit card required.
Add Your Device
Choose a hostname and get a unique API token for your device.
Install the Script
One curl command on a cron schedule — we handle the DNS automatically.
Stay Connected
Your hostname always resolves. Get alerted if your device goes dark.
Giving Back to the Industry
GreatDDNS is operated by Exodus Telecom Inc., a CRTC-registered Canadian telecommunications provider. After 20+ years installing and maintaining professional networks, we built the DDNS service we always wished existed — and we are proud to offer it free of charge as our way of giving back to the industry. The operating costs are covered by our telecom business. No ads. No catch.