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23 lines
690 B
Markdown
23 lines
690 B
Markdown
# Netcat
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- `-N`: close the network socket when finished; not available in nmap's netcat
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- `-l`: bind to the port and listen for incoming connections (server mode)
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- `-n`: do not resolve hostnames via DNS
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- `-p`: specify the source port to use
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- `-t`: use telnet negotiation
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- `-u`: use UDP
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- `-v`: set verbosity level; can be used several times
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- `-w=SECS`: timeout for connects and final net reads, in seconds
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- `-z`: zero-I/O mode, exit once connected
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## TL;DR
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```sh
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# Check port 22 on hosts.
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nc -Nnvz 192.168.0.81 22
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parallel -j 0 "nc -Nnvz -w 2 192.168.0.{} 22 2>&1" ::: {2..254} | grep -v "timed out"
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# Wait for a host to be up.
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until nc -Nvz -w 3 pi4.lan 22; do sleep 3; done
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```
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