How do I test if a port is open on a remote system?

1142595 pts.
Tags:
Linux
Networking
Telnet
A while back, I used telnet to check if a port on my remote post was open. But at my new job, the systems don't have telnet installed / all outbound connections to host are blocked. Does anyone know of a way to see if a port is open on a remote system? I'm using Linux. Thank you.
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  • TheRealRaven
    ...if a port on my remote {h}ost was open.

    What is "my remote host"? The wording makes it sound as if it's not an employer or client system. And if it's employer/client, it's not clear how you could be expected to do much with it if all connections are blocked.
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  • ToddN2000
    Sounds like you are trying to do something your employer does not want you to. If you need to find an open port ask them what is not blocked for use.
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  • NitinIND

    As per my understanding you want to check access to specific port on remote IP address is available or not.

    In this case netcat is best option available in Unix Server .

    #netcat -zv Hostname  Range_or_specific_port

    Command Sample :--

    # netcat -zv RemoteIP    22-443
    localhost RemoteIP 443 (https) open
    localhost RemoteIP 111 (sunrpc) open
    localhost RemoteIP 80 (http) open
    localhost RemoteIP 22 (ssh) open

    Netcat will check the port available on remote ip,  if it is accessible.

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