Netcat,nmap Common examples

1, Port scan

Port scans are often used by system administrators and hackers to discover ports that are open on some machines to help them identify vulnerabilities in the system.

NC-ZVN 172.16.160.111 21-25

Can be run in TCP or UDP mode, by default the Tcp,-u parameter is adjusted to UDP. # #udp测试 No matter what port is detected successed

The z parameter tells Netcat to use 0 IO, Close the connection immediately after the connection is successful, and no data exchange

The V parameter refers to the use of redundancy options

The n parameter tells Netcat not to use DNS to reverse-query the domain name of the IP address

This command prints 21 to 25 of all open ports. Banner is a text that banner is a text message sent to you by a service that you connect to. Banner information is useful when you are trying to identify a vulnerability or the type and version of a service. However, not all services will send banner.

Once you find the open ports, you can easily use the Netcat connection service to crawl their banner.

2. UDP port test

Nmap-su-p 5000 172.16.160.111

Netcat,nmap Common examples