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Current state: "Under Discussion"

Discussion thread: here   - pre-KIP discussion

JIRA: 

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• single IP address: same as in the current version
• IP address range: start and end address separated by a minus sign (for example: 10.0.0.1-10.0.0.10 or 192.168.0.1-192.168.10.255)
• Subnet in CIDR notation: see wikipedia (for example: 10.0.0.0/24)

The kafka-acl tool will accept a comma separated list containing any combination of the above, which allows for flexible specification of multiple ranges, if necessary. So for example the following would be possible: 10.0.0.1,192.168.0.0/24,10.10.0.1-10.10.0.150

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