Invalid public IP address for the selected subnet mask

Invalid public IP address for the selected subnet mask

Invalid starting public IP address for the selected subnet mask. Enter a valid IP address that corresponds to the size of the subnet mask.
Subnet Mask
Starting Public Subnet Address
255.255.0.0
The last two octets must be 0.
EXAMPLE: 10.200.0.0
255.255.255.0
The last octet must be 0.
EXAMPLE: 10.200.1.0
255.255.255.128
The last octet must be 0 or 128.
EXAMPLE: 10.200.1.0 or 10.200.1.128
255.255.255.192
The last octet must be one of these numbers: 0, 64, 128, 192.
EXAMPLE: 10.200.1.64
255.255.255.224
The last octet must be one of these numbers: 0, 32, 64, 96,128, 160, 192, 224.
EXAMPLE: 10.200.1.32
255.255.255.240
The last octet must be one of these numbers: 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240.
EXAMPLE: 10.200.1.16
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