So what is a port and how does it work?
Well, in computer networks, hardware connections are terminated, physically wired or wireless.
In software, a port within an operating system is a logical structure that identifies software specific
process or service.
The ports are identified by 16 bit long numbers of each protocol and address combination.
The most common protocols that use port numbers are the Transmission Control Protocol TCP and the User
Data Graham Protocol UDP.
Now, the port number is always associated with a host IP address and its communication protocol type.
Completes the destination or source network, address a message.
And in uncertain port numbers are used for specific services, for example, Port Haiti is used by GDP
or at 443 is used by HTTPS protocol.
So then this way, the package can be easily transmitted to the running application.
The most commonly used sports are sports one through 10, 24.
And other ports can be specified to a particular application.
The most used default ports.
So below are the most commonly used default ports and the names of the services that use them.
And it's important to remember these ports know them well.
Is because we can understand what the systems are in the target network when we're scanning, so according
to the port scan results, we can plan the next step.
Or if there are services that we know are used within the target network, we can scan directly for
the services and then finish the scanning process without getting caught in the security systems.
So 421 is open FTP services available.
And for 53, is open DNS services available.
If Port 110 is open, there is an SMTP service, which means that mail service is up and running.
FTP is 21 as H 22.
Telnet is always 23.
SMTP 25.
DNS UDP 53.
HDP, A-T.
Pop three 110 net bios one three nine.
IMAP 143, S&P UDP one six one.
SMB, Microsoft, DDP for four or five.
R.S. age five one for VMware, nine 02.
Ms.
Escudo, one, four, three, three.
Oracle DBI 15 21, Maisky well, 33 06, Redzepi 33, 89, the ANC fifty nine hundred.
Proxy application servers, AT&T and 1881.