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 9060
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Port 3658
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Port 2837
Ports those registered with IANA are shown as official ports. The same port number
Port 2245
Ports those registered with IANA are shown as official ports. The same port number
Port 7013
Ports those registered with IANA are shown as official ports. The same port number
Port 87
Ports those registered with IANA are shown as official ports. The same port number
Port 1323
Ports those registered with IANA are shown as official ports. The same port number
Port 2090
Port 2090 is usually used by some web hosting control panels, such as Cpanel,
Ports 900 – 1000
Port 900- Port 1000 Port 1000- Port 1100 Port 1100- Port 1200 Port 1200-
Port 32245
Ports those registered with IANA are shown as official ports. The same port number
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