October 29, 2019 · Basic Pen-Testing

Common port usage table

0 - 1023 : well known ports assigned to common protocols and services
1024 - 49151 : registered ports assigned by ICANN to a specific service
49152 - 65535 : dynamic (private, high) ports range from 49,152 to 65,535. Can be used by any service on an ad hoc basis. Ports are assigned when a session is established, and released when the session ends.

Port Service name Transport protocol
 20, 21  File Transfer Protocol (FTP)  TCP
 22  Secure Shell (SSH)  TCP and UDP
 23  Telnet  TCP
 25  Simple Mail Transfer Protocol (SMTP)  TCP
 50, 51  IPSec
 53  Domain Name System (DNS)  TCP and UDP
 67, 68  Dynamic Host Configuration Protocol (DHCP)  UDP
 69  Trivial File Transfer Protocol (TFTP)  UDP
 80  HyperText Transfer Protocol (HTTP)  TCP
 110  Post Office Protocol (POP3)  TCP
 119  Network News Transport Protocol (NNTP)  TCP
 123  Network Time Protocol (NTP)  UDP
 135-139  NetBIOS  TCP and UDP
 143  Internet Message Access Protocol (IMAP4)  TCP and UDP
 161, 162  Simple Network Management Protocol (SNMP)  TCP and UDP
 389  Lightweight Directory Access Protocol  TCP and UDP
 443  HTTP with Secure Sockets Layer (SSL)  TCP and UDP
 3389  Remote Desktop Protocol  TCP and UDP