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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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