System / Well Known Ports: 0 through 1023
User / Registered Ports: 1024 through 49151 <===> These are ports that can be registered by companies and developers for a particular service.
Dynamic/Private: 49152 through 65535 <===> These is client-side ports that are free to use. These are ports that your computer assigns temporarily to itself during a session


prvni dva typy pouzivaji servery.. treti Dynamic/Private pouziva klient tedy nas PC.. Muze se ale stat, ze na svem pctake bezi servr, tudiz tam muze vlatne bezet i prvni dva typy System Porty a User Porty