Port 4021

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
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