Know Thy Ports

A port is either physical or logical in this section we are going to talk about the logical ports.

The purpose of a computer logical port is it acts as an end point to a logical connection in which a client application specifies a specific program on a computer network.

The IANA Internet Assigned Numbers Authority provides well known ports that are preassigned specified in RFC 1700.

There are 0-1024 privileged ports and the are 0 up to 65,536 ports

Here are the most well known port numbers

Port Protocol

7 Echo
15 Netstat
20/21 FTP
22 SSH
23 Telnet
25 SMTP
37. Time Protocol
42. Host Name Server Protocol
49 TACACS
50 IPSec
53 DNS
67 DHCP/BOOTP
68. BOOTP/DHCP
69 TFTP
70 Gopher
80 HTTP
88 Kerberos
110 POP3
111 Port Map
118 SQL
119 NNTP
123 NTP
137 NetBIOS Name Service
138 NetBIOS Datagram
139 NetBIOS Service
143 IMAP4
161 SNMP
162 SNMP Trap
194 IRC
389 LDAP
443 SSL
445 Active Directory Services
500 ISAKMP
513 rlogin
520 RIP
546 DHCP6
636 SLDAP
1512 WINS
1701 L2TP
1720 H.323
1723 PPTP
1812 RADIUS
3389 RDP
5004 RTP
5060 SIP

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