Use your own domain

Note

Connecting your own domain is a Pro feature. A class website on a classmoji.io subdomain is not.

Before you start

You need three things: a class website already live on a subdomain, a domain (or a subdomain of one) that you control, and access to that domain’s DNS records. A departmental domain and a course domain you bought yourself both work.

Add the domain

Go to Settings → Website and find the Custom domain section. Enter the domain you want the site served on, such as cs52.me or cs52.department.edu, and save it.

Classmoji then shows the DNS records to add. Nothing changes for your visitors until those records exist.

Point the domain at Classmoji

There are two groups of records, and they answer two different questions.

Routing — add ONE of these, not both

Option	When to use it
A (and AAAA) records	Point the name straight at our addresses. Works anywhere, including at a root domain like cs52.me where a CNAME often cannot go.
CNAME record	One record, and it follows us if our addresses ever change. Many DNS hosts refuse a CNAME at a root domain: there, use their ALIAS, ANAME or CNAME flattening record with the same value (Cloudflare flattens automatically).

Adding both is not extra insurance. A CNAME alongside an A record for the same name is an invalid zone, so pick the row that fits your DNS host and add only that one.

Proof of ownership — any one of these

Record	Name
CNAME	_acme-challenge.{your domain}
TXT	_fly-ownership.{your domain}

If your routing choice included an AAAA record, it does double duty: it routes IPv6 traffic and proves ownership, so you can skip this group entirely. The page tells you when that applies.

Watch the certificate

Classmoji requests the TLS certificate for you as soon as the records resolve. The status chip next to the domain reports where it is:

Chip	Meaning
No certificate yet	The request has not started
Pending DNS	We are still waiting on your records
Issuing	Records found, certificate being issued
Active	The certificate is live and the domain is served over HTTPS

DNS changes take anywhere from a few minutes to a few hours to propagate, depending on your host and the record’s previous TTL. Nothing here needs babysitting: leave the tab, come back later.

The domain is marked verified once the site has actually served a request on that hostname, which is a stronger signal than a record merely existing.

Disconnect a domain

Use the disconnect button in the same section. The site stays reachable at its classmoji.io subdomain, so disconnecting takes the custom address down without taking the course site down.

Disconnecting stays available even if a Pro subscription lapses. A domain you pointed at us is one you must always be able to point somewhere else.

What’s next

• Publish a class website
• Build pages