new services, for use by firewall administrators and other network monitors. "dyn" in the ports field denotes dynamically allocated port(s), usually in the range >=1024 <=65535 A name in the ports field (e.g. LDAP) indicates that service is also required A plus sign + in the ports field indicates the service may use a series of ports starting at the specified one An asterisk * in the Notes field indicates that the ports are IANA registered When a specific port is registered it is usually assigned for both TCP and UDP even though only one or the other may be required. Where possible I have only shown the required ones. This is not intended to list old, well-documented services such as telnet, FTP etc. You can find these in the IANA list. You may contact me by email with any suggestions or corrections, or post a message to the TCP/IP Ports discussion.