Port 4021

Modified by:

Port 4021 is typically used for File Transfer Protocol (FTP) data transfer. It is commonly used by FTP servers as the default port for data transfers in passive mode.

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 4021
tcp
nexus-portal
Nexus Portal
REGISTERED PORT
Port 4021
udp
nexus-portal
Nexus Portal
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 20013
Ports those registered with IANA are shown as official ports. The same port number
Port 1522
Port 1522 is used for Oracle Net Services, which allows client applications to communicate
Port 220
Port 220 is commonly used for Secure Shell Protocol (SSH). This is a network
Port 4374
Ports those registered with IANA are shown as official ports. The same port number
Port 31337
Port 31337 is commonly used for Internet Relay Chat (IRC) and as a backdoor
Port 9022
Port 9022 is commonly used for communication between VMware vSphere servers and clients, specifically
Port 3444
Port 3444 is not assigned for any specific service or protocol according to the
Port 1154
Port 1154 is not a standardized port number and does not have a common
Port 26208
Ports those registered with IANA are shown as official ports. The same port number
Port 4681
Port 4681 is commonly used for the WD My Cloud storage device remote access
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