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Christoph Giesel christophlsa

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christophlsa / gist:469dcfede999945f23437bb6a203e8a5
Last active December 3, 2025 13:19 — forked from miztiik/gist:551fe97118c23c265c698186f50f20dc
Checking ports without telnet

Here are several different ways to test a TCP port without telnet.

BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23
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christophlsa / keybase.md
Created April 8, 2014 21:48

Keybase proof

I hereby claim:

  • I am christophlsa on github.
  • I am synex (https://keybase.io/synex) on keybase.
  • I have a public key whose fingerprint is A9D7 973E 448F 921D B96F 1673 FEF2 F3A2 15C7 C0C9

To claim this, I am signing this object: