To set up a custom domain for your blog:
- Choose a registrar, or use tools like Yahoo Domains or Domainr to find and buy a domain name that's available. (This usually costs about $10-$40 per year.) Note that Tumblr only allows your domain name to be 64 characters or less.
- Create a DNS record based on how many levels your custom domain contains. See the chart below.
Your registrar should have instructions on how to implement the proper CNAME or A-record.
Okay, now head over to Tumblr:
- Click "Settings" under the account menu at the top of the dashboard, then choose the blog you’d like to update.
- Click the pencil to the right of the username section (Tumblr URL section for secondary blogs) and enable "Use a custom domain."
- Enter your domain (e.g., mywebsite.com) or subdomain (e.g., blog.mywebsite.com), then click “Test your domain.”
- Correct any problems if the test finds any, and click “Test your domain” until the test is successful.
- Hit “Save.”
Other things to note:
- When someone visits your Tumblr URL, they will automatically be redirected to your new custom domain (i.e., david.tumblr.com will redirect to davidslog.com).
- You don't need to change the nameservers for your domain.
- After re-configuring your domain, you may need to wait up to 72 hours for the changes to take effect. If you visit the subdomain or domain and your Tumblr blog is showing up just fine, then congrats, all is well and good, stop fiddling around with this stuff.
- If you see a Tumblr error page, but not your actual blog, it means you’ve at least correctly pointed the domain to Tumblr but haven’t configured your blog to use it yet. You should probably take care of that back up in the "Okay, now head over to Tumblr" section above.
- We’re unable to support many of the domain-specific issues that crop up, so it’s best if you ask a friend who has done this before. Or consult a trusted authority figure. A firefighter, for example.
- And please, for the love of all that is holy, don't use the same password for your Tumblr account & your domain registration account. It might be convenient but any firefighter would tell you, it's a really bad idea.