Each Allow or Deny list entry can be used to specify one of these:
•A single IP address
•A range of IPv4 addresses specified as ip-address/subnet-mask (for example, 192.168.100.197/255.255.255.0) or in CIDR format (for example, 192.168.100.0/24)
•A range of IPv6 addresses specified in CIDR format (for example, 2001:0db8::/32)
The CIDR entry that matches all IPv4 addresses is 0.0.0.0/0. The CIDR entry that matches all IPv6 addresses is 0::0/0.
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