Self-hosted DynDNS

Roll your own free dynamic DNS (DynDNS) service with these simple steps:

1. Host your DNS zone with a provider offering API access.
2. Deploy a DynDNS script to a FaaS platform.

For Cloudflare, follow these instructions:

1. Add your domain to Cloudflare.
2. Set up your development environment.
3. Deploy the DynDNS worker:
   • Obtain the worker script and run npm i.
   • Modify the domain in wrangler.jsonc.
   • Add subdomain tokens to src/tokens.json.
   • Execute wrangler deploy.

Verify operation with these commands:

# Sets the A/AAAA record to the IP address from the request.
curl https://dyndns.your.domain/your_token

# Explicitly sets the A/AAAA records.
curl https://dyndns.your.domain/your_token?ipv4=1.2.3.4&ipv6=::1

# Removes the A/AAAA records.
curl -XDELETE https://dyndns.your.domain/your_token

That’s all there is to it!