Custom domain for tumblr

A records:

• 50.22.53.155
• 50.22.53.157
• 72.32.231.8
• 174.121.98.156
• 174.121.66.230
• 50.22.53.155
• 50.22.53.157
• 72.32.231.8
• 50.97.149.180
• 50.97.149.181
• 50.97.149.182
• 50.97.149.183
• 66.6.44.4

CNAME:  point CNAME record to "domains.tumblr.com"

Read More at "custom domains for tumbler" for addition steps.