New posts in Subdomain

Do intermediate subdomains need to exist?

How did someone point a sub-domain of our domain to someone else's IP address?

How to reverse proxy to different places depending on subdomain in Nginx?

If I don't want subdomains to send out email, do I need SPF records for them?

Are DNS records private information?

Does each subdomain need it's own SSL certificate?

Is a wildcard DNS record bad practice?

How to create an SSL certificate for more than one subdomain?

How do I redirect subdomains to a different port on the same server?

Third level domain - howto