NAT how port numbers are chosen when using PAT


PAT (also referred to as [NAT](/network-address-translation-nat)overloading) divides the available ports per global IP address into three ranges: 

* 0-511
* 512-1023
* 1024-65535

PAT assigns a unique source port for each [UDP](/udp) or [TCP](/tcp) session.

For more information on how inside global port values are assigned, take a look at [NAT how port numbers are chosen when using PAT](/nat-how-port-numbers-are-chosen-when-using-pat)

Links:

https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/26704-nat-faq-00.html

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PAT (overloading) maximum number of translations per inside global address

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