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Port 20001 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
20001 tcp trojans Insect, Millennium, PSYcho Files trojans SG
20001 udp qnap QNAP CloudLink uses port 20001 UDP to allow access without explicit port forwarding (technology similar to STUN for VoIP). CloudLink is not required if ports are manually forwarded and the NAS accessible.
QNAP uses the following ports:
Web server: 80,8081 TCP and 443,8080 TCP (web admin)
FTP/SFTP/SSH: 20,21,22 TCP and 13131 TCP (telnet)
Remote Replication: 873,8899 TCP
VPN server: 1723 TCP (PPTP), 1194 UDP (OpenVPN)
CloudLink: port 20001 UDP (optional, only required for access without manual port forwarding)

Game: Blazing Angels Squadrons of WWII (developer: Ubisoft Romania)
20001 tcp trojan Insect, Millenium, PSYcho Files Trojans
20001 tcp,udp microsan MicroSAN IANA
20001 tcp Insect [trojan] Insect SANS
20001 tcp Millenium(Lm) [trojan] Millenium (Lm) SANS
20001 tcp Millenium [trojan] Millenium SANS
20001-20004,20050,20080 udp applications Blazing Angels Online Portforward
20000-20010 udp applications Cal Ripkens Real Baseball Portforward
20000-21000 udp applications Ground Control Portforward
20000-21000 udp applications Ground Control with Chat Rooms Portforward
20000-20019 tcp applications ICQ Portforward
12 records found
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Related ports: 20000  20002  873  8081  8899  13131  20050  20080  

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External Resources
SANS Internet Storm Center: port 20001

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

Please use the "Add Comment" button below to provide additional information or comments about port 20001.
  User Reviews/Comments:
by Whaw - 2015-06-23 10:27
Qnap is using this port to connect to there servers.
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