Advanced·Troubleshoot the network

nc: Test connection or listening port

Syntax

nc [-zv] Host Port

Examples

nc -zv example.com 443

Usage and sandbox support

For review only: practice in a real Linux environment, this sandbox does not execute this command.

This command is for reference and review, and the simulation terminal does not provide corresponding exercises yet.

Full documentation ↗

Related commands

• ipQuery address and routing
• ssView sockets and listening ports
• pingCheck host connectivity
• digQuery DNS records
• nslookupQuery host address
• curlRequest URL or download content
• wgetDownload file
• sshLog in to the remote machine
• scpCopy files via SSH
• hostQuery DNS
• tracerouteProbing network routes
• tracepathDetection path and MTU
• mtrContinuously observe routing and packet loss
• socatConnect data streams to sockets
• tcpdumpCapture network packets
• nmapDetect authorized host port
• ethtoolQuery network interface information
• nmcliManage NetworkManager connections
• sftpTransfer files interactively through SSH
• ssh-keygenGenerate SSH key
• ssh-copy-idInstall the SSH public key
• opensslCheck TLS with certificate