When referring to a computer or device a hardware port resembles a plug-in or connection commonly found on the back of a computer. Hardware ports allow computers to have access to external devices such as computer printers. Below is a short listing of the different types of computer ports you may find on a computer.AT Port (Old Keyboard Port)Firewire portLPT Port (Printer Port)PS/2 Port (Keyboard Port / Mouse Port)Serial PortUSB Port
Term used to describe the process of taking a program that has been written for specific operating systems and moving it to another operating system. For example, taking a program written for Microsoft Windows and moving it to Linux.
When referring to a network or to the Internet a software port is a location where information is sent through. A commonly used and accessed port is port 80, which is the http port. A listing of commonly known and used ports can also be found on the below listing. Users running Microsoft Windows can utilize the netstat command to view current active connections that include ports currently being used.Users who wish to block ports on their computer or network can use a software or hardware firewall. If you are unable to get access to a particular port it's likely that a firewall is already present on the Network or other network settings set by the administrators have been setup.
Port
Protocol
Description
0

Reserved
1
TCP
TCP Port Service Multiplexer
5

Remote Job Entry
7
TCP, UDP
ECHO
9
TCP, UDP
Discard
13
TCP, UDP
Daytime - RFC 867
17
TCP, UDP
Quote of the Day
18
TCP, UDP
Message Send Protocol
19
TCP
Chargen - RFC 864
20
TCP
FTP - Data
21
TCP
FTP - Control
22
TCP
SSH Remote Login Protocol
22
UDP
PCAnywhere
23
TCP
Telnet
24

Private e-mail system
25

SMTP
27
TCP
ETRN
33

Display Support Protocol
35

Private print server
37
TCP, UDP
Time - RFC 868
38
TCP, UDP
Route Access Protocol
39
UDP
Resource Location Protocol
42

Nameserv (Host Name Server)
43

Whois
47

NI FTP
48

Default Audit Daemon
49

Login
50

Remote Mail Checking Protocol
52

XNS Time Protocol
53

DNS
57

Private terminal access
58

XNS mail
59

Private file service
60

NI mail
63

whois++
65

TACACS-Database Service
66

Oracle SQL*NET
67

Bootstrap Protocol Server
68

Bootstrap Protocol Client
69

TFTP
70

Gopher
75

Private dial out service
79

Finger
80

HTTP
81

HOSTS2 Name Server
82

XFER Utility
87

Any private terminal link
88

Kerberos
89

SU/MIT Telnet Gateway
92

Network Printing Protocol
93

Device control Protocol
95

SUPDUP
98

TAC news
103

X400
106

3COM-TSMUX
107

Remote Telnet Service
108

SNA Gateway Access Server
109

POP2 (Post Office Protocol version 2)
110

POP3 (Post Office Protocol version 3)
115

Simple File Transfer Protocol
118

SQL Services
199

NNTP
130

CISCO FNATIVE
131

CISCO TNATIVE
132

CISCO SYSMAINT
135

Blaster worm
137

NETBIOS Name Service
138

NETBIOS Datagram Service
139

NETBIOS Session Service
143

IMAP
150

SQL-NET
151

HEMS
152

Background File Transfer Program
153

SGMP
154

NETSC
156

SQL Service
158

PCMail Server
161

SNMP
168

RSVD
179

Border Gateway Protocol
190

Gateway Access Control Protocol
200

AppleTalk Routing Maintenance
202

AppleTalk Name binding
204

AppleTalk Echo
206

AppleTalk Zone information
213

IPX
217

dBase UNIX
219

Unisys ARP
220

Interactive Mail Access Protocol v3
256


258

Yak Winsock Personal Chat
263

HDAP
264

BGMP
280

HTTP-mgmt
315

DPSI
321

PIP
349

mftp
363

RSVP tunnel
366

ODMR
377

NEC Corporation
378

NEC Corporation
384

A Remote Network Server System
385

IBM Application
387

AppleTalk Update-Based Routing Protocol
391

SynOptics SNMP Relay Port
396

Novell Netware over IP
397

Multi Protocol Trans. Net.
402

Genie Protocol
406

Interactive Mail Support Protocol
413

SMSP
420

SMPTE
430

UTMPSD
431

UTMPSD
443

HTTPS
444

SNMP
445

Microsoft DS
458

Apple Quick Time
511

PassGo
514

Syslog
515

Spooler
519

UNIX time
525

Time server
530

rpc
531

Chat
533

Emergency broadcasts
545

Apple Quick Time Server
546

DHCP Client
547

DHCP Server
563

SNEWS
565

whoami
568

Microsoft shuttle
569

MSN
585

IMAP4+SSL
666

Doom Id Software
711

Cisco TDP
799

ControlIT
989

FTP protocol, data, over TLS/SSL
990

FTP protocol, control, over TLS/SSL
992

Telnet protocol over TLS/SSL
993

IMAP4 protocol over TLS/SSL
994

IRC protocol over TLS/SSL
995

POP3 protocol over TLS/SSL
1025


1026


1080

Socks
1477

Microsoft SNA Server
1502

Shiva
1755

Microsoft NetShow
1812

RADIUS
4000

ICQ
4000
TCP, UDP
Battle.net
5190

AOL
5191

AOL 1
5192

AOL 2
5193

AOL 3
5631

PCAnywhere
5632

PCAnywhere
5800
TCP
VNC
5801
TCP
VNC
5900
TCP
VNC
5901
TCP
VNC
6112
TCP, UDP
Battle.net
6113
TCP, UDP
Battle.net
6114
TCP, UDP
Battle.net
6115
TCP, UDP
Battle.net
6116
TCP, UDP
Battle.net
6117
TCP, UDP
Battle.net
6118
TCP, UDP
Battle.net
6119
TCP, UDP
Battle.net
6500

Net2Phone Registration
6667

IRC
6801

Net2Phone
7000

VDOLive
7070

Real Audio
7075

Real Audio
8008

HTTP alternative
8080

HTTP alternative
12345

Port used by Trend Micro anti-virus program. Port 12345 is also commonly used by various Trojans such as Netbus.
12468

VXtreme
26000

Quake
43188

please include your source next time - asendure
http://www.computerhope.com/jargon/p/port.htm

This post has been edited by AsenDURE: Aug 1 2006, 10:14 AM