How do I determine the ARN of my Amazon route53-hosted zone?

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http://serverfault.com – I've got some machines which automatically update DNS in Route53. So far there are only two zones in Route53, and both of them are updated this way, so I have an IAM policy which says "blah blah blah, Resource: "*"" and everything is good. Now I want to add a third zone, and not let those machines mess it up - so I need to change the Resource: to something specific. Amazon tells me this value that the resource specification should follow the following format: arn:aws:route53:::<resource>/<id>. Multiple values are comma limited. What I don't know is how to determine the val (HowTos)