How to Ping a Specific Port in Linux

The normal ping command uses ICMP and has no port. To test whether a port accepts connections, use a tool that opens a TCP connection to that port.

Method 1: telnet

telnet [address] [port-number]

Example:

telnet example.com 443

If it says Connected to ..., the port is open. Connection refused means closed, and a long wait or a timeout usually means a firewall drops the packets. Press Ctrl+] and type quit to leave. Install telnet with sudo apt install telnet if needed.

Method 2: netcat (nc)

nc -vz [address] [port-number]

Example:

nc -vz google.com 443

• -v gives verbose output.
• -z only checks the port and sends no data.

Add -w 3 to wait 3 seconds at most.

Method 3: nmap

nmap -p [port-number] [address]

Example:

nmap -p 443 google.com

Check a range of ports:

nmap -p 20-25 example.com

The result can be open, closed or filtered (a firewall blocks the answer).

Method 4: curl

curl [protocol]://[address]:[port-number]

Example:

curl -I http://example.com:80

A reply, even an error page, means the port works. This tests web ports (HTTP and HTTPS).

Method 5: Bash only

You can test a port without any extra tools:

timeout 3 bash -c '</dev/tcp/example.com/443' && echo "open" || echo "closed"

Check the ports on your own server

To see which ports are listening locally:

sudo ss -tulpn

Quick recap

• nc -vz host port is the quickest check.
• nmap is best for several ports.