TCP Ping - check TCP ports from the command line

PortCheck is a free command line tool for Windows 11. It allows administrators to perform "TCP Pings" to remote machines. TCP Ping is actually not a correct term, as Ping is a fixed term for sending and receiving ICMP packets. PortCheck is able to check if a TCP port of a remote host answers to a TCP request or not. This allows you to check whether a server is still providing a particular service. PortCheck is a small portable tool with a size of only 166 K. It has many additional features like checking multiple hosts on multiple ports - or delivering a return value for use in own scripts.

TCP Ping to a remote host. Option -st displays date and time (timestamp). You can also log the output to a logfile.

The syntax:

PortCheck [-t] [-i] <hostname(s)> <port(s)>

Examples:

PortCheck MyServer 80 # single check

PortCheck -t MyServer 443 # continuous

Also possible:

PortCheck -t SRV-EXCH1,SRV-DB1 443 # multiple hosts, one TCP port

PortCheck -t SRV-EXCH01 25,443 # single host, multiple TCP ports

PortCheck -t SRV-EXCH1,SRV-DB1 443,1521 # multiple hosts, multiple TCP ports

PortCheck -t -st Fileserver01 445 # check TCP port 445 (SMB) with timestamp (-st)

PortCheck -t -bp SRV-SQL1 1433 # check port 1433 (MS SQL) of SRV-SQL1 with beep in case of failures

PortCheck -t -st Terminal-Server01 445 1000 c:\temp\Port445.txt # log to file

PortCheck Oracle-Server01 knownports # check a list of "known ports" (about 1000)

PortCheck -i # interactive mode, values are requested by user

PortCheck Fileserver01 cp # check custom ports. Ports can be defined in customports.txt

If you are looking for a graphical TCP ping tool instead of a command line tool, you can have a look at Ping Tool 4.3. PingTool is a utility for system administrators and network admins. It displays the availibility and the TCP Ping response time of remote hosts in a GUI:

PingTool is a free graphical TCP port check software. A red object indicates that the device is not responding. If objects are responding they are display in green with response time.

PingTool highlights:

Graphical Ping tool with TCP port check (TCP ping)
Response times in milli seconds (ms)
Wake-on-Lan tool (magic packet)
Integrated Lan speed test tool (bandwidth)
Loading and saving configurations
Dashboard for difficult environments
Custom actions in the event of failure
Adjustable ping intervall from 1 second to 2 minutes
User-defined actions (context menu)
Send configurations to collegues

You can also have a look at the article TCP Port check Powershell in Windows 11. It describes how to check TCP ports with the Test-NetConnection (tnc) command in the PowerShell console.

Table oft important TCP Ports:

TCP Port Number	Application
21	FTP (File Transfer Protocol)
22	SSH (Secure Shell)
23	Telnet
25	SMTP (Simple Mail Transfer Protocol)
80	HTTP (Hypertext Transfer Protocol)
110	POP3 (Post Office Protocol)
135	WMI (Windows Management Instrumentation)
139	NetBIOS (Network Basic Input Output System)
143	IMAP4 (Internet Message Access Protocol)
443	HTTPS (Hypertext Transfer Protocol Secure)
445	SMB (Server Message Block)
1433	MS Sql
1494	Citrix (ICA)
1521	Oracle
3389	RDP (Remote Desktop Protocol)
5060	SIP (Session Initiation Protocol)
5985	WinRM
5986	WinRM - Secure

>>> TCP Ping Homepage

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Software: PortCheck
Category: TCP Ping for Windows / Check TCP ports Windows 11
Type: Command line (cmd), TCP port ping, Ping TCP port number
Operating Systems: Windows 7 / Windows 8 / Windows 10 / Windows 11 / Windows Server 2008 / Windows Server 2012 / Windows Server 2016 / Windows Server 2019 / Windows Server 2022 / Windows Server 2025