IPv4 NAT IP Information 
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You have been assigned a range of 20 ports along with your NAT IPv4 address.
The first 21 ports are based on the last octet of your IP, you can use these for anything you want, examples below: 

EXAMPLES: 
172.16.0.3 has the following port range forwarded: 301 - 321
172.16.0.13 has the following port range forwarded: 1301 - 1321
172.16.10.33 has the following port range forwarded: 3301 - 3321
172.16.20.133 has the following port range forwarded: 13301 - 13321
172.16.30.7 has the following port range forwarded: 701 - 721
172.16.40.17 has the following port range forwarded: 1701 - 1721
172.16.50.221 has the following port range forwarded: 22101 - 22121

IPv4 NAT SSH-Port Information
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In addition to the 21 Ports that can be freely used, there is also an additional Port-Forward for SSH.
This is calculated by prepending the last octet of the private IP-Address to the ssh port.

EXAMPLES:
172.16.0.3 has the following port forwarded to port 22: - 322
172.16.0.133 has the following port forwarded to port 22: - 13322