A DuckDNS alternative that also works behind CGNAT
DuckDNS does one thing: point a subdomain at your IP. That stops working the moment your ISP puts you behind CGNAT. rslvd.net is free dynamic DNS plus reverse tunnels, automatic HTTPS, and apps — so your services stay reachable either way.
rslvd.net vs DuckDNS
| rslvd.net free | DuckDNS | |
|---|---|---|
| Free subdomains | 2 (yourname.rslvd.net) | 5 |
| Works behind CGNAT | Yes — built-in reverse tunnels | No — needs public IP + port forwarding |
| Automatic HTTPS certificates | Yes (Let's Encrypt, managed for you) | DIY (DNS-01 challenges) |
| Standard DynDNS update protocol | Yes (routers, ddclient, DD-WRT, OpenWrt) | Own API |
| Native Android updater app | Yes | Third-party only |
| TCP/UDP/DNS tunnels | Yes | No |
| Web dashboard with update logs | Yes | Minimal |
Keep your existing setup
rslvd.net speaks the standard DynDNS v2 update protocol used by routers and ddclient:
https://rslvd.net/api/update?key=YOUR_KEY&ip=AUTOReady-made setup scripts exist for Linux, Windows, DD-WRT and OpenWrt, plus a native Android app that updates your IP in the background.
And when DDNS isn't enough…
If your ISP uses CGNAT (common on LTE, 5G, Starlink, and many fiber ISPs), no DDNS service can make your IP reachable — you don't have one. rslvd.net's tunnel client dials out from your network and exposes your service at your subdomain anyway. Same account, same dashboard.