I'm also using Cloudflare for DDNS, but I'm using my router's support for updating DDNS: I'm hosting a basic Sinatra app on Heroku that the router can ping. The

I'm also using Cloudflare for DDNS, but I'm using my router's support for updating DDNS: I'm hosting a basic Sinatra app on Heroku that the router can ping. The app does a (very basic) auth check, extracts the public IP, and updates Cloudflare.