Setup guides

Point your subdomain at a GitHub Pages site with a CNAME, and verify it on your GitHub account.

Add your subdomain as a Netlify custom domain using their load balancer alias.

Connect a Vercel project with a CNAME, plus a TXT record if Vercel asks for one.

Attach your subdomain to a Pages project. Proxying is supported here.

The general pattern for self-hosted apps and providers not listed here.

Point your subdomain straight at a server you control using an A record.

Serve over IPv6 with an AAAA record, optionally alongside an A record.

Prove domain ownership to Google, Vercel, Netlify or any other service.

Advertise a service on a non-standard port — Minecraft, SIP, Matrix and similar.

Restrict which certificate authorities may issue for your subdomain.