Amazon MQ (RabbitMQ): Is the IP address of the endpoint static or dynamic?

I have Amazon MQ (RabbitMQ) with public access.
I have to provide my Amazon MQ's IP address to my partner to whitelist the IP address in their firewall.

And I saw the architecture of Amazon MQ (RabbitMQ) use the NLB behind the scene.
ref: https://docs.aws.amazon.com/amazon-mq/latest/developer-guide/rabbitmq-broker-architecture-cluster.html

Can I use the IP address of my endpoint <broker-id>.mq.<region>.amazonaws.com?

Is it dynamically or static IP address?

Thanks.