Port Number

Protocol type

20

TCP

FTP-Control

21

TCP

Telnet

23

TCP

SMTP

25

TCP

DNS

53

UDP

TFTP

69

UDP

HTTP

80

TCP

POP3

110

TCP

MSN Messenger (File transfer)

6891-6900

TCP

MSN Messenger (Voice)

6901

TCP/UDP

NNTP

119

TCP

NTP

123

UDP

NetBIOS-ns

137

TCP/UDP

NetBIOS-dgm

138

UDP

NetBIOS-ssn

139

TCP

IMAP

140

TCP

SNMP

161

UDP

SNMP-Trap

162

UDP

IRC

192

TCP

LDAP

389

TCP

HTTPS

443

TCP/UDP

Microsoft-DS

445

TCP/UDP

ISAKMP/IKE

500

UDP

SYSLOG

514

UDP

PRINTER

515

TCP

LDAPS ( LDAP over TLS/SSL)

636

TCP

DOOM ( Doom Id Software)

666

TCP/UDP

MS-SQL-S ( Microsoft-SQL-Server)

1433

TCP/UDP

MS-SQL-M ( Microsoft-SQL-Monitor)

1434

TCP/UDP

WINS ( Microsoft Windows Internet Name Service)

1512

TCP/UDP

L2TP

1701

UDP

PPTP

1723

TCP

RADIUS ( RADIUS authentication protocol)

1812

UDP

RADACCT ( RADIUS accounting protocol)

1813

UDP