Licensing

PortCheck is not open Source, but free of charge for private and professional use. You can use PortCheck without any restrictions, in unlimited number and with unlimited duration for free. You are not allowed to distribute PortCheck alone or as part of your software. This requires a written permission from Lugrain Software GmbH.

Syntax

PortCheck 3.0.0.16 by Lugrain Software 05/2024
Checks if a remote TCP port is responding.

Easy syntax:

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

Examples:

PortCheck -i               # interactive (ask for input)
PortCheck MyServer 80      # single check
PortCheck -t MyServer 443  # continuous

More complex syntax:

PortCheck [-t] [-i] [-w:<pause in s>] [-st] [-nc] [-oo] [-nl] [-tc] [-bp] [-bp+] [-4] [-6]
          [-rcf:<batch file when closed>] [-rcc:<closed count>] [-rco] [-rch]
          [-rof:<batch file when open>] [-roc:<open count>] [-roo] [-roh]
          [-replaceopentext:<text when open>] [-replaceclosedtext:<text when closed>]
          <hostname(s)> <port(s)> [<timeout in ms>] [<filename of logfile>] [<description>]

hostname(s)    One or more hostnames, separated by comma (no blanks)
port(s)        One or more TCP port numbers (separated by comma), a port
range          <startport>-<endport> or all wellknown ports 'knownports' or 'kp'
timeout        Can be 100-1000 (default: 1000ms)
filename       Logs everything to a specified file, including date and time
description    Your own description for the specified port

-t    Check the specified ports continuous
-w    Wait some time between checks (this is not the timeout)
-4    Prefer IPv4 (if both are available)
-6    Prefer IPv6 (if both are available)
-st   Show date and time in every line
-nc   No color: use default color instead of green and red
-oo   Only open: show only open ports
-nl   No lines: don't add separators
-tc   Toggle colors: swap green and red (port opened = alarm)
-bp   Beep: send acoustical signal in case of alarm (only with -t)
-bp+  Beep: send acoustical signal in case of OK and timeout (only with -t)

Examples:

PortCheck www.bing.com 80
PortCheck -t www.bing.com 80
PortCheck oracle-server1 1521 500 c:\temp\logfile.txt oracle
PortCheck -t -bp MyFileserver 139
PortCheck -t -w:10 MyFileserver 139,445
PortCheck -t -tc -bp sql-server1,sql-server2 1433 300
PortCheck -oo MyServer 1-1024
PortCheck MyServer knownports
PortCheck -t -rcf:"c:\data\closed.cmd" -rcc:3 -rco Citrix-Server 1494
PortCheck -t -replaceclosedtext:"Machine isn't working properly. Please call 1234!" Citrix-Server 1494

Returns ERRORLEVEL=0 when port is closed, ERRORLEVEL=1 when port is opened.

Every server, client and network device provides TCP ports via which a TCP connection can be established. If you monitor these TCP ports, you can get a good impression of whether the device is working properly.

Here's a list of often used TCP ports with port number:

21 - FTP (File Transfer Protocol)
22 - SSH (Secure Shell)
23 - Telnet
25 - SMTP (Simple Mail Transfer Protocol)
80 - HTTP (Hypertext Transfer Protocol)
110 - POP3 (Postoffice Protocol)
135 - DCE / WMI (Distributed Computing Environment)
139 - NetBIOS (Network Basic Input/Output System)
143 - IMAP4 (Internet Messaging Access Protocol)
443 - HTTPS (Hypertext Transfer Protocol - Secure)
445 - SMB (Server Message Block)
995 - POP3 Post Office Protocol encrypted
1433 - MS SQL
1494 - ICA (Citrix - Independent Computing Architecture)
1521 - Oracle
3389 - RDP (Remote Desktop Protocol)
5060 - SIP (Session Initiation Protocol)
5985 - WinRM (Windows Remote Management)
5986 - WinRM Secure (Windows Remote Management encrypted)
8080 - HTTP alternative
8443 - HTTPS alternative