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 1
Ports those registered with IANA are shown as official ports. The same port number
Port 4712
Ports those registered with IANA are shown as official ports. The same port number
Port 3823
Port 3823 is typically used for the management of network devices such as routers,
Port 189
Ports those registered with IANA are shown as official ports. The same port number
Port 2028
Ports those registered with IANA are shown as official ports. The same port number
Port 4003
Ports those registered with IANA are shown as official ports. The same port number
Ports 18600 – 18700
Port 18600- Port 18700 Port 18700- Port 18800 Port 18800- Port 18900 Port 18900-
Port 8403
Ports those registered with IANA are shown as official ports. The same port number
Port 7099
Ports those registered with IANA are shown as official ports. The same port number
Port 2049
Port 2049 is used for the Network File System (NFS) service, which is a
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