How does the A-Record thing works on Tumblr?
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**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.