Some of these port numbers — standardized by the IANA (<emphasis>Internet Assigned Numbers Authority</emphasis>) — are “well-known” for being associated with network services. For instance, TCP port 25 is generally used by the email server. The list of services associated with port numbers can be found in the <filename>/etc/services</filename> file, also explained in <citerefentry><refentrytitle>services</refentrytitle> <manvolnum>5</manvolnum></citerefentry>, as well as in: <ulink type="block" url="https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml" />
بعض أرقام هذه المنافذ – التي وحدتها IANA (سلطة أرقام الإنترنت المحجوزة <emphasis>Internet Assigned Numbers Authority</emphasis>) – ”مشهورة“ باقترانها مع خدمات شبكية معينة. مثلاً، منفذ TCP 25 يستخدمه مخدم البريد الإلكتروني عادة. <ulink type="block" url="http://www.iana.org/assignments/port-numbers" />