26

RSFTP

Medium Risk

TCP/UDP — Email

Port Overview

Port Number 26
Service Name RSFTP
Transport Protocol TCP/UDP
Category Email
Security Risk Medium
Port Range Well-Known (0-1023)

What is Port 26?

Port 26 is unassigned by IANA but is commonly used as an alternate SMTP port by some ISPs and hosting providers to bypass port 25 blocking. Also occasionally referred to as RSFTP.

TCP/UDP Email

Security Considerations

Port 26 (RSFTP) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.

Recommendation: Keep the service updated. Monitor logs for unusual activity.

Related Ports — Email

Related Terms