Standard tcp ip port & important port numbers

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Hello again ! Today I’m going to share with you the important port and standard tcp ip port numbers, which you need to know when designing a network. Actually the port numbers are assigned by IANA (Internet Assigned Number Authority).

Standard tcp ip port & important port numbers

We are discussing here in IPv4. The maximum port numbers can be 65535. Here in this post we’ll gain some knowledge about port in number and standard TCP / IP port. The port number can generally be divided into three categories. They are:

1. Well known ports: Range 0-1023
2. Registered ports: Range 1024-49151
3. Private and/or Dynamic ports: Range 49152-65535

Lets have some small discussion about these ports:

As from the lists we can able to know that the well known ports ranges from 0 to 1023. So what is the purpose of these ports? Generally, these ports are used for services and applications. The services and applications includes HTTP that means web server purpose. These ports can also be used for POP3 or email server purpose. These ports can also be used for telnet purpose.

The Registered ports is used for user application or user process. For this type of ports, the users need to choose the ports to install an application. This ports may also be used dynamically for selecting its source ports by a client.

The Dynamic ports can also be called as Ephemeral ports. These ports cab be used dynamically by its client with the help of application.

Some applications may use both TCP and UDP port. It is seen that sometimes, the low overhead of UDP enables DNS to serve many client request very quickly. Sometimes, however, sending the requested information may require the reliability of TCP. In this case, the well known port number of 53 is used by both protocols with this service.

Here is some example of TCP port numbers:

Well known TCP ports:

Port no.	Services
21	FTP (File Transfer Protocol)
23	Telnet
25	SMTP (Simple Mail transfer Protocol)
80	HTTP (hyper Text Transfer Protocol)
110	POP3
194	IRC (Internet Relay Chat)
443	HTTPS (HTTP Secure)

 

Here is some Registered port no.:

Port no.	Services
1863	MSN Messenger
8008	Alternate HTTP
8080	Alternate HTTP

 

So we’ve seen some TCP ports no and their services. Now lets see the UDP ports:

Well known ports:

Port no.	Services
69	TFTP
520	RIP

 

Registered ports:

Port no.	Services
1812	RADIU’s Authentication Protocol
2000	Cisco SCCP (VoIP service)
5004	RTP (Voice and Audio Transport Protocol)
5060	SIP (VoIP)

 

Now lets come to the some common ports of TCP/UDP:

Well known ports:

Port no.	Services
53	DNS
161	SNMP
531	AOL Instant Messenger, IRC

 

Registered Ports:

Port no.	Services
1433	MS SQL
2948	WAP (MMS)

 

So, these are the ports I’ve tried to give you. Also for update of any kinds of ports related or port no. you may visit IANA website.

So, how about the posts, hope that you will like this. Hope that this post helps you to enrich your knowledge. The information I’ve provided here, is taken from different website and CISCO. If you have any kinds of opinion, please leave comment. Also feel free to ask questions about the post related information in the comment section.

Thanks for your visit. Keep visiting and sharing information. J