Port 1991

Modified by:

Port 1991 is primarily used as the communication port for Cisco STUN Protocol, which is used by Cisco IP Phones to send requests to the primary and secondary Cisco CallManager servers. It is also sometimes used for the TCP/IP Siemens SIMATIC S7 communication protocol and Cal SNMP Trojans.

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 1991
tcp
stun-p2
cisco STUN Priority port
REGISTERED PORT
Port 1991
udp
stun-p2
cisco STUN Priority port
REGISTERED PORT

UnOfficial

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

Port Protocol (TCP/UDP) Description
TCP UDP Ports
Other ports
Port 3000
Port 3000 is commonly used for running web servers or applications in development environments.
Port 6406
Port 6406 is commonly used for MySQL database replication. It allows for the transfer
Port 3221
Ports those registered with IANA are shown as official ports. The same port number
Ports 6100 – 6200
Port 6100- Port 6200 Port 6200- Port 6300 Port 6300- Port 6400 Port 6400-
Port 1564
Port 1564 is used for the protocol called “Border Gateway Protocol (BGP) with Multiprotocol
Port 2203
Port 2203 is commonly used for communication between remote desktop clients and servers using
Port 5265
Ports those registered with IANA are shown as official ports. The same port number
Port 8193
Port 8193 is commonly used for Citrix server communication and is used for the
Port 394
Ports those registered with IANA are shown as official ports. The same port number
Port 3702
Port 3702 is commonly used for the Simple Object Access Protocol (SOAP) discovery service
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