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 1727
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Port 25005
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Port 7100
Port 7100 is commonly used for remote device management, including printing and scanning. It
Ports 32500 – 32600
Port 32500- Port 32600 Port 32600- Port 32700 Port 32700- Port 32800 Port 32800-
Port 1863
Port 1863 is typically used for instant messaging services such as MSN Messenger and
Port 1976
Ports those registered with IANA are shown as official ports. The same port number
Port 2104
Ports those registered with IANA are shown as official ports. The same port number
Port 402
Ports those registered with IANA are shown as official ports. The same port number
Port 376
Ports those registered with IANA are shown as official ports. The same port number
Port 1163
Ports those registered with IANA are shown as official ports. The same port number
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