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Commonly Attacked Network Ports

This is a simple list of ports that are commonly used and frequently attacked.

21/tcp - FTP 
22/tcp - SSH 
23/tcp - Telnet 
25/tcp - SMTP 
53/both - DNS 
80/tcp - HTTP 
110/tcp - POP3 
123/udp - NTP 
137/both - NetBIOS Name Service 
138/both - NetBIOS Datagram Service 
139/both - NetBIOS Session Service 
143/tcp - IMAP 
389/both - LDAP 
443/tcp - HTTPS 
445/tcp - Active Directory 
465/tcp - SMTPS 
587/tcp - SMTP 
995/tcp - POP3S 
1022/tcp - SSH-2 
1433/tcp - MS-SQL 
3306/both - MySQL 
3389/both - RDP 
4786/both - Cisco Smart Install
5432/both - PostgreSQL 
8080/tcp - HTTP-2 
11211/udp - Memcached
Written on April 13, 2018