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how do I format the origin domain name when creating a cloudfront distribution?

I am trying to create a cloudfront distribution from a ec2 instance. the first input is for a origin domain name.My ec2 ami has a public ip of 55.41.26.75. would this be the correct way to format it:

ec2-55.41.26.75.compute-1.amazonaws.com

Docs are not very helpful.

Thanks!