I'm part of a concern that runs licensed Elasticsearch instances within sensitive environments, and we have been noticing that our instance tries to call home to an unpredictable range of hostnames and IPs associated with register.elastic.com and license.elastic.co.
Do you have any guidance for the IP range Elastic co intends to use for these license server call homes? Our architectures tend to permit traffic based on IPv4 alone, so this unpredictability can be hazardous to our ops.
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