Tumblr

Tumblr is a micro-blogging service.

One of its features is replacing your Tumblr URL with an external domain. It requires you to change the DNS A record for your registered domain to Tumblr's IP address.

Configure Tumblr for a custom domain registered with Dreamhost
A record Method * Name should be left blank * Type should be A * Value' should be 66.6.44.4, Tumblr's IP Address CNAME record Method * Name should be www * Type should be CNAME * Value should the domains.tumblr.com Note: If you would like the www domain to work as well, you'll have to add a CNAME DNS record in the Dreamhost Panel. * Name should be www * Type should be CNAME * Value should be my.custom.tumblr.domain.com
 * 1) In the Panel go to Manage Domains
 * 2) Find the domain you'd like to use and click on "Edit" under the "Web Hosting" column.
 * 3) At the bottom of the page, click the "Host DNS only!" button.
 * 4) Now click on the "DNS" link under the domain's name.
 * 5) The next step differs depending on how many levels your custom domain contains:
 * 6) * If your custom domain contains two levels (e.g. mywebsite.com), use the A-record method
 * 7) * If your custom domain contains three or More Levels (e.g. www.mywebsite.com or blog.mywebsite.com), use the CNAME record method

Last step!
 * 1) Go to Customize Tumblr
 * 2) Check off "Use a custom domain name"
 * 3) Below the check box, fill in the custom domain i.e. yourdomain.com

Adding Additional Tumblr DNS Records For Round-Robin DNS Protection (OPTIONAL)
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This be out of date - trying to figure out the new values / better solution!

--note--

Please note - this also applies to adding Tumblr DNS records for a sub domain (because you can't set a new sub-domain to "Host DNS only!").

To illustrate the pictorial example, YOUR_DOMAIN.TLD will be represented by 'junk.com' and DESIRED_SUB_DOMAIN will be represented by 'tumblr'. To add Tumblr micro-blogging services to 'tumblr.junk.com', simply add five (5) "Type" 'A' record with the "Name" 'tumblr' and the "Value" set to the 5 IP addresses3. You can test that it's working at Tumblr's connection site, just keep hitting "Check domain" until it cycles through the IP addresses listed to the main address (you'll see a "This domain is configured correctly" message) and you should be good to go! Then just finish following the directions1 and you should be good to go!