How to ping and test for a specific port from Linux or Unix command line


wanted to see if a specific port of a desktop computer or server is open from a Linux or Unix command line shell. How do I ping a specific port? Is it possible possible to ping an or ports?


You use the ping command to send ICMP ECHO_REQUEST packets to network computers, routers, switches and more. ping works with both IPv4 and IPv6. Ping is using ICMP protcol. The ping command can not be used to ping a specific port.


However, use any one of the following command to see if a port is open or not as follows:

Use telnet command

The syntax is:

telnet {host} {port}

telnet 80

telnet 80


Sample outputs:


Connected to router.

Escape character is  ^] .


telnet> q

Connection closed.

To close your session, press Ctrl+]+q.

Use nc command

The syntax is:

nc -vz {host} {port}

nc -vz 80

nc -vz 443


Sample outputs:

found 0 associations

found 1 connections:

1: flags=82

outif utun1

src port 54997

dst port 443

rank info not available

TCP aux info available


Connection to port 443 [tcp/https] succeeded!

Use nmap command

The syntax is:

nmap -PNp {port} {host}

nmap -p {port} {host}

nmap -p 22

nmap -p 443


Sample outputs:

Starting Nmap 7.40 ( ) at 2017-05-24 01:00 IST

Nmap scan report for router (

Host is up (0.00034s latency).


443/tcp open  https


Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

See “Top 32 Nmap Command Examples For Sys/Network Admins” for more info.

Use bash shell

The syntax is as follows:

check for tcp port ##

need bash shell ##

(echo >/dev/tcp/{host}/{port}) &>/dev/null && echo  open  || echo  close

(echo >/dev/udp/{host}/{port}) &>/dev/null && echo  open  || echo  close

(echo >/dev/tcp/ &>/dev/null && echo  Open 22  || echo  Close 22

(echo >/dev/tcp/ &>/dev/null && echo  Open 443  || echo  Close 443

Sample outputs:

Close 22

Open 443

Use nping command

Nping is an open-source tool for network packet generation, response analysis and response time measurement. Nping allows users to generate network packets of a wide range of protocols, letting them tunevirtually any field of the protocol headers. While Nping can be used as a simple ping utility to detect active hosts, it can also be used as a raw packet generator. The syntax is:

sudo nping –tcp -p {port} {host}

sudo nping –tcp -p 443


Sample outputs:

Fig.01: nping just pinged host at port 443



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