It can be anything! An apex, subdomain, or even a URL.

Results forapp.clein.org

Resolver

Location

A

Name	TTL	Value
app.clein.org	300	104.21.66.15Cloudflare, Inc.
app.clein.org	300	172.67.198.173Cloudflare, Inc.

Name	TTL	Value
app.clein.org	300	2606:4700:3032::ac43:c6ad
app.clein.org	300	2606:4700:3033::6815:420f

Name	TTL	Value
app.clein.org	300	10 feedback-smtp.us-west-1.amazonses.com
app.clein.org	300	10 mxa.mailgun.org
app.clein.org	300	10 mxb.mailgun.org

Name	TTL	Value
app.clein.org	300	v=spf1 include:mailgun.org ~all