Skip to content

Instantly share code, notes, and snippets.

View christophlsa's full-sized avatar

Christoph Giesel christophlsa

54 followers · 15 following
View GitHub Profile
@christophlsa
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