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mrgloom
Asked: 2016-12-31 02:10:35 +0800 CST

How to list all reachable ports?

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I can test some specific port by nc -zv <server_ip> <port> or by accessing it in browser http://<server_ip>:<port>/.

But how to get a list of all reachable ports on server?

Update: Also I was able to scan port range with this command:

nc -zv <server_ip> <port_range_start>-<port_range_end> 2>&1 | grep succeeded

networking

2 Answers

  1. nmap -p1-65535 ${SERVER_IP}
nmap -sU -p1-65535 ${SERVER_IP}

    The first variant scans all TCP ports; the second all UDP ports. Note that if you try broad portscanning over a public network, or against a server/network for which you are not an administrator, you are likely to trigger an IDS and get blocked.

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  2. Net map is a powerful network scanner. If you wish to know more about the target computer and it's open ports use:

    sudo nmap -O target.host.com

    or, for example

    sudo nmap -O 192.168.1.1

    This will report open ports, and information about the target machine. There are many many options for nmap. Refer to the info or man pages

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