IP whitelisting allows specific IPs to access server without any limitation.
IP address ranges and wildcards are supported by Wing FTP Server, as below:
IP address must be exactly matched(e.g. 192.168.1.1).
A specified range of IP addresses, e.g. 192.168.1.10-25.
A specified range of IP addresses, e.g. 192.168.1.0-192.168.5.255.
*.*.*.* or xxx.*.*.* or xxx.xxx.*.* or xxx.xxx.xxx.*
Any valid IP address value (For example, 192.168.*.* represents any IP between 192.168.0.0 and 192.168.255.255).
CIDR convention is also supported :
192.168.0.0/24 (represents any IP between 192.168.0.0 and 192.168.0.255)