Port 25

Modified by:

Port 25 is used for SMTP (Simple Mail Transfer Protocol), which is responsible for the delivery of email messages from one server to another. This port is utilized for sending email messages from email clients such as Microsoft Outlook, Mozilla Thunderbird, and others to the email servers for sending to the recipient’s mailbox.

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 25
tcp
smtp
Simple Mail Transfer
WELL KNOWN PORT
Port 25
udp
smtp
Simple Mail Transfer
WELL KNOWN 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 1115
Ports those registered with IANA are shown as official ports. The same port number
Port 2373
Ports those registered with IANA are shown as official ports. The same port number
Port 1140
Ports those registered with IANA are shown as official ports. The same port number
Port 9992
Ports those registered with IANA are shown as official ports. The same port number
Port 1492
Ports those registered with IANA are shown as official ports. The same port number
Port 6486
Port 6486 is commonly used for communication between Microsoft Operations Manager (MOM) agents and
Port 4534
Ports those registered with IANA are shown as official ports. The same port number
Port 1536
Port 1536 is used for the Transmission Control Protocol (TCP) and User Datagram Protocol
Ports 47000 – 47100
Port 47000- Port 47100 Port 47100- Port 47200 Port 47200- Port 47300 Port 47300-
Port 622
Port 622 is not an official port number assigned by IANA. It may be
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