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It's possible to expose the Kafka broker to the public, but you will need credentials, IAM permissions or a valid certificate (depending on the auth method configured).
It's also possible to disabled authentication, but in that case it's not possible to directly expose the port to the Internet.
b-{1,2,3,4}.{user_provided}.{random_id}.c{1,2}.kafka.{region}.amazonaws.com
{user_provided}.{random_id}.c{1,2}.kafka.useast-1.amazonaws.com
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