![]() ![]() KerberosĘ8/tcp kerberos5 krb5 kerberos-sec # Kerberos v5 Http 80/udp # HyperText Transfer Protocol Tacacs-dsĖ5/tcp # TACACS-Database Service Re-mail-ckĕ0/tcp # Remote Mail Checking Protocol Tacacs 49/tcp # Login Host Protocol (TACACS) Tcpmux 1/tcp # TCP port service multiplexer # If you need a huge list of used numbers please install the nmap package. # by IANA and used in the real-world or are needed by a debian package. # New ports will be added on request if they have been officially assigned # even if the protocol doesn't support UDP operations. ![]() # port number for both TCP and UDP hence, officially ports have two entries # Note that it is presently the policy of IANA to assign a single well-known Some are defined in RFC 1340, and more are defined by IANA.ĭetails of the reserved ports are listed on most systems in the /etc/services file, an example of which is shown below (taken from a Ubuntu Linux distribution). These are referred to as well known ports. The first 1000 ports are reserved for specific applications, and on Linux can normally own be used by a daemon / application that has super user privileges. ![]() The port numbers area available for both TCP and UDP, and when referred to in conjunction with the IP address it specifies the "socket". The combination of IP address, port and protocol is called a socket, and has to be unique for every service. The port is used to distinguish the application. Whilst the IP address provides the connection to the correct machine, it cannot distinguish the different service that is required. TCP and UDP port numbers (/etc/services) quick reference ![]()
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