If you need a free SSL certificate for an IP address, here’s a practical trick:

🔧 Steps:

1. Instant IP to DNS mapping using traefik.me

   • traefik.me resolves DNS automatically:

     <any-subdomain>.<your-ip>.traefik.me → your-ip
     

   • Example:

     foo.bar.253.36.126.29.traefik.me → 253.36.126.29
     

2. Point your server at *.traefik.me

   • Configure your server to respond to a subdomain like:

     myapp.203.0.113.42.traefik.me
     

3. Use Let’s Encrypt with HTTP challenge

   • Setup a reverse proxy (e.g., Caddy, Traefik, Nginx) with Let’s Encrypt:

     # Example Caddyfile
     myapp.203.0.113.42.traefik.me {
       reverse_proxy localhost:8080
       tls {
         issuer acme
       }
     }
     

✅ Benefits:

• No DNS setup required.
• Free SSL via Let’s Encrypt.
• Works for any public IP.

Happy hacking!

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