How does the A-Record thing works on Tumblr?

Question

First of all, sorry if I'm not 100% clear, I'm really confused on all of this.

I noticed that you can always use an A/AAAA DNS Record on Tumblr, so if you visit (and navigate) blog.something.com/* (where * is anything else) it uses the Tumblr infrastructure and system, but without modifying the URL at all.

My question is: I know that you'll have to add a A Record on your domain (on something.com) but: how do they handle the A Record on their side?

Hope the question makes sense.

Answer 1

You'd use a wildcard DNS entry on your DNS server with a wildcard configuration on your web server (for example, a wildcard ServerAlias on apache).