Source: How-to-geek
Would you like to personalize your Tumblr blog with your own domain name? Here’s how you can redirect a domain to Tumblr and register it with your blog.
When you signup for a new Tumblr Blog, by default your blog’s address will beyour_blog_name.tumblr.com. One of the best reasons to use your own domain name is that you could always move the domain to another blog service if you decide to switch and quit blogging at Tumblr. With your own domain, your blog’s identity is secure, and best of all, once you own a domain it’s free to add it to your Tumblr. Here’s how to do it.
Redirect Your Domain to Tumblr
First, you need to own a domain name. There are many popular domain registrars, and you can usually signup for a new domain name for around $10. If you don’t already have one, find a domain hosting service you feel good with and signup for a new domain name.
Once you’ve got a domain name, you need to direct your domain name to point to Tumblr’s servers. Or, if you want to keep your domain name at a current site, you could redirect a subdomain to Tumblr. Our domain was hosted with 1&1, so here’s how to do it there; the process is generally the same on other registrars, though the wording may be slightly different. Login to your domain administration page, and if your hosting company offers multiple services, select to Manage your Domain.
Now select your domain name, click the DNS button, and select Edit DNS Settings. Again, this may appear different depending on your domain registrar, but should in general work the same.
Now, on the IP Address settings, select Other IP address, and then enter Tumblr’s IP address:
72.32.231.8
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