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rponte/netcat-verifying-remote-ports.sh

Last active January 6, 2020 17:17
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Verifying whether a remote port is open or not using Netcat (nc)
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netcat-verifying-remote-ports.sh
# https://www.2daygeek.com/how-to-check-whether-a-port-is-open-on-the-remote-linux-system-server/
nc -zvw3 -G5 <host> <port_or_range_of_ports>
# -z : scanning mode
# -v : verbose
# -w3: read timeout in seconds (3 sec) / obs: On Mac OS X the -w3 parameter is ignored.
# -G5: connect timeout in seconds (5 sec)
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rponte commented Jan 6, 2020 •
edited

https://www.2daygeek.com/how-to-check-whether-a-port-is-open-on-the-remote-linux-system-server/
https://stackoverflow.com/questions/24198456/issue-with-netcat-timeout

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rponte commented Jan 6, 2020 •
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On Mac OS X (10.14.6) the -w3 (timeout) parameter is somehow ignored

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rponte commented Jan 6, 2020

verifying local ports,
https://gist.github.com/rponte/1173447

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