Doc Hocks "DannielynnBirkhead.com" for $1 Million

TMZ has learned Dannielynn Birkhead is up for grabs! As a domain name, anyway.

Dr. Mark Moore (yeah, a doctor!) has purchased the domain name "Dannielynnbirkhead.com" and is selling it on eBay for a million dollars. Good luck.

The practicing anesthesiologist, who owns several businesses, bought the name a couple months ago for a measly $4.95. Moore has the name up on eBay on the auction block, with a starting bid of $250,000. The auction will continue until April 20 -- and at this point, he hasn't knocked anyone out; there are no bidders. But you can "Buy it Now" for a million smackers.

TMZ spoke to John Shaw, an employee of Moore, who told us that when the Anna Nicole Smith story started heating up, he got the call to purchase the domain. When asked about their projected financial gain, he said, "I would expect this to yield much for that 5 bucks." Relax and start counting backwards.