The XSOAR server does support both IPv4 and IPv6. It listens on port 443 of both networks and will respond. It also recognizes IPv6 network addresses as an indicator type and can submit it to compatible integrations to enrich with reputation data. The caveat being that the specific integration has to be able to support the request and the API call. I was unable to find documentation directly addressing that question either. My information comes from internal (Customer Success) discussions with the Software Engineers.
Let me know if that addresses your questions or if you have something specific you need!
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