Port 991

Modified by:

Port 991 is used for Secure Telnet Protocol over TLS/SSL, which provides encrypted communication between the telnet client and server. It is primarily used for remote administration and maintenance of network devices and servers.

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Official

Port
Protocol (TCP/UDP)
Title
Description
Port Type
Port 991
tcp
nas
Netnews Administration System
WELL KNOWN PORT
Port 991
udp
nas
Netnews Administration System
WELL KNOWN PORT

UnOfficial

Unofficialy or sometimes with conflict, the same port may be used by different applications.

Port Protocol (TCP/UDP) Description
TCP UDP Ports
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Port 1487
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Port 3493
Ports those registered with IANA are shown as official ports. The same port number
Port 2066
Port 2066 is not a well-known port and does not have a specific assigned
Ports 43200 – 43300
Port 43200- Port 43300 Port 43300- Port 43400 Port 43400- Port 43500 Port 43500-
Port 23333
Port 23333 is not assigned to a specific service or application. It is an
Ports 8000 – 9000
Port 8000- Port 8100 Port 8100- Port 8200 Port 8200- Port 8300 Port 8300-
Port 2407
Port 2407 is commonly used for the Secure Sockets Layer (SSL) version of the
Ports 45400 – 45500
Port 45400- Port 45500 Port 45500- Port 45600 Port 45600- Port 45700 Port 45700-
Port 6567
Port 6567 is commonly used for the IRC (Internet Relay Chat) protocol, which is
Port 2923
Ports those registered with IANA are shown as official ports. The same port number
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