Port 7
Echo Protocol
Port 21/20
File Transfer Protocol (FTP) data transfer
Port 22
Secure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding
Port 23
Telnet protocol�unencrypted text communications
Port 25
Simple Mail Transfer Protocol (SMTP), used for email routing between mail servers
Port 49
TACACS+ Login Host protocol
Port 53
Domain Name System (DNS)
Port 69
Trivial File Transfer Protocol (TFTP)
Port 80
Hypertext Transfer Protocol (HTTP)
Port 88
Kerberos-network authentication, uses tickets
Port 110
Post Office Protocol, version 3 (POP3)
Port 119
NNTP-Network News Transfer Protocol transports usenet articles
Port 135
RPC/epmap/dcom-scm are Microsoft End Point Mapper/DCE Endpoint Resolution used to locate DCOM ports Also known as Remote Procedure Call
Port 137-139
NetBIOS-NETBIOS Name, Datagram, and Session Services, respectively for name querying, sending data, NetBIOS connections
Port 143
IMAP-Internet Message Access Protocol receives e-mail with advantages over POP3
Port 161
SNMP-Simple Network Management Protocol for remotely monitoring network devices
Port 162
SNMPTRAP-Simple Network Managment Protocol Trap, traps and Inform Requests are sent to the SNMP Manager on this port
Port 389
LDAP-Lightweight Directory Access Protocol maintains directories of users and other objects
Port 443
HTTPS-Hypertext Transfer Protocol Secure is for secure transfer of hypertext through web pages (uses TLS or SSL), SSL VPN
Port 445
SMB-Server Message Block provides shared access to files and other resource
Port 514
Syslog-Syslog Protocol is used for computer message logging especially for router and firewall logs. Secure version uses TCP as the transport mechanism and port 6514.
Port 636
LDAP over TLS/SSL-secure version of LDAP
Port 989/990
FTPS-FTP Secure uses SSL/TLS to secure FTP transmissions. 990 is the control port and 989 is the data port.
Port 1701
L2TP-Layer 2 Tunneling Protocol is a VPN Protocol with no inherent security. Often used with IPsec.
Port 1723
PPTP-Point-to-Point Tunneling Protocol-VPN protocol with built-in security
Port 3389
RDP-Remote Desktop Protocol (Microsoft Terminal Server) remotely views and controls other Windows systems.
67-68
DHCP - Dynamic Host Configuration Protocol
514
Syslog
500
ISAKMP - Internet Security Association and Key Management Protocol
1812-1813
RADIUS