Is there a bulk way of updating a contact address across multiple domains?

No native way in AWS.

But you can write boto3 script and loop around a file picking one domain at a time.

Better to test out with 2 to 3 test domains before doing bulk change.

You may also face some throttling, so make sure to add some wait time.

[1] update-domain-contact - https://docs.aws.amazon.com/cli/latest/reference/route53domains/update-domain-contact.html [2] UpdateDomainContact - https://docs.aws.amazon.com/Route53/latest/APIReference/API_domains_UpdateDomainContact.html