CEH

38 Chapter 2 ■ System Fundamentals

Port Use

88 Kerberos

110 POP3

111 Portmapper - Linux

123 NTP

135 RPC-DCOM

139 SMB

143 IMAP

161, 162 SNMP

389 LDAP

445 CIFS

514 Syslog

636 Secure LDAP

tablE 2.3 Registered ports of interest

Port Use

1080 Socks5

1241 Nessus Server

1433, 1434 SQL Server

1494, 2598 Citrix Applications

1521 Oracle Listener

2512, 2513 Citrix Management

3389 RDP

6662–6667 IRC

tablE 2.2 Well-known ports (continued)