Ethical Hacking simplified. TCP/IP ports (System Fundamentals).

TCP/IP ports

TCP/IP ports are like doors which the device used to connect to other devices. Ports do not only give path for communication but they also grouped data or services. This ports are assigned with numbers which serves as identifiers. For example using the port 80 or 8080, you are sending or receiving HTTP files, because the port number is assigned to Hypertext Transfer Protocol this protocol main responsibility is sending and receiving websites pages. The TCP/IP ports ranges from 0 to 65535.

Ports are divided into the following categories.

Well Known ports
Registered ports
Dynamic ports

Well Known ports: This are the commonly used ports. This category ranges from 0 to 1024. They are the ones that we interact with more frequently.

Some of the most used Ports

Use Port Numbers

FTP 20, 21

SSH 22

Telnet 23

SMTP 25

WINS 42

DNS 53

HTTP 80, 8080

Kerberos 88

POP3 110

Portmapper – Linux 111

FTP over SSH 115

NTP 123

RPC-DCOM 135

SMB 139

IMAP 143

SNMP 161, 162

BGP 179

BGMP 264

MAC OS X server Admin 311

LDAP 389

UPS 401

CIFS 445

Syslog 514

DHCPv6 client 546

DHCPv6 server 547

SMTP 587

IPP 631

Secure LDAP 636

Registered ports: This are ports that are used by applications which the user is not concern about. They are ports which some software used to help them accomplish there task. They ranges from 1025 to 49151.

Below are some of the registered ports (they are selected randomly).

Use Port Numbers

Socks5 1080

Nessus Server 1241

Dell open manage HTTPS 1311

SQL Server 1433, 1434

Citrix Applications 1494, 2598

Oracle Listener 1521

Citrix Management 2512, 2513

RDP 3389

IRC 6662–6667

Bit torrent tracker 6969

Avast web shield 8742

Hyper VM HTTP 8887

Xpilot contact 15345

Dynamic ports: This are the ports that are not officially registered and are available for any application to use. They ranges from 46152 to 65535.

Reference: wikipedia.org

NB: For any comment, suggestion or corrections feel free to contact Me through the comment box. Thanks.

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