Port 2821

Modified by:

Port 2821 is primarily used for communication between email servers using the Simple Mail Transfer Protocol (SMTP) for email delivery. It is commonly referred to as the ESMTP port and is used by mail transfer agents to send, receive, and relay email messages between different email systems.

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 2821
tcp
vrts-at-port
VERITAS Authentication Service
REGISTERED PORT
Port 2821
udp
vrts-at-port
VERITAS Authentication Service
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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