Description of the Portqry.exe command-line utility

• 09/08/2020
• 2 minutes to read
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Portqry.exe is a command-line utility that you can use to help troubleshoot TCP/IP connectivity issues. The utility reports the port status of TCP and UDP ports on a computer that you select.

Original product version:   Windows 10 - all editions, Windows Server 2019, Windows Server 2012 R2
Original KB number:   310099

More information

Portqry.exe reports the status of a TCP/IP port in one of the following three ways:

• Listening

  A process is listening on the port on the computer that you selected. Portqry.exe received a response from the port.

• Not Listening

  No process is listening on the target port on the target system. Portqry.exe received an Internet Control Message Protocol (ICMP) Destination Unreachable - Port Unreachable message back from the target UDP port. Or if the target port is a TCP port, Portqry received a TCP acknowledgment packet with the Reset flag set.

• Filtered

  The port on the computer that you selected is being filtered. Portqry.exe didn't receive a response from the port. A process may or may not be listening on the port. By default, TCP ports are queried three times, and UDP ports are queried one time before a report indicates that the port is filtered.

Portqry.exe can query a single port, an ordered list of ports, or a sequential range of ports.

Examples

The following command tries to resolve reskit.com to an IP address and then queries TCP port 25 on the corresponding host:

portqry -n reskit.com -p tcp -e 25

The following command tries to resolve 169.254.0.11 to a host name. It then queries TCP ports 143,110, and 25 (in that order) on the host that you selected. This command also creates a log file (Portqry.log) that contains a log of the command that you ran and its output.

portqry -n 169.254.0.11 -p tcp -o 143,110,25 -l portqry.log

The following command tries to resolve my_server to an IP address and then queries the specified range of UDP ports (135-139) in sequential order on the corresponding host. This command also creates a log file (my_server.txt) that contains a log of the command that you ran and its output.

portqry -n my_server -p udp -r 135:139 -l my_server.txt

Portqry.exe is available for download from the Microsoft Download Center. To download Portqry.exe, see PortQry Command Line Port Scanner Version 2.0.

For more information about PortQry version 2.0, see New features and functionality in PortQry version 2.0.

For more information about Port requirements for the Microsoft Windows Server System, see:
Service overview and network port requirements for Windows.