nc — Linux Platform — Linux Platform

Syntaxe

nc [OPTIONS] HÔTE PORT

Options principales

Option	Description
`-l`	Mode écoute (serveur)
`-v`	Mode verbeux
`-z`	Scanner les ports sans envoyer de données
`-w`	Délai d'attente en secondes

Exemples

Scanner les ports ouverts d'un serveur

$ nc -zv 192.168.1.50 20-25
nc: connect to 192.168.1.50 port 20 (tcp) failed: Connection refused
nc: connect to 192.168.1.50 port 21 (tcp) failed: Connection refused
Connection to 192.168.1.50 22 port [tcp/ssh] succeeded!
nc: connect to 192.168.1.50 port 23 (tcp) failed: Connection refused
nc: connect to 192.168.1.50 port 24 (tcp) failed: Connection refused
Connection to 192.168.1.50 25 port [tcp/smtp] succeeded!

Tester la connectivité vers un service web

$ nc -zv -w 3 example.com 443
Connection to example.com (93.184.216.34) 443 port [tcp/https] succeeded!

Créer un serveur d'écoute simple

$ nc -lv 8080
Listening on 0.0.0.0 8080
Connection received on 10.0.0.5 49312
GET / HTTP/1.1
Host: 192.168.1.42:8080
User-Agent: curl/8.7.1
Accept: */*