UDP Port Checker Online

OpenPort UDP Port Checker Online tool can check if a UDP Port is open or closed. To use the tool you will have to set the remote target and port. The remote target can be an IP address or host/domain name.

This is a beta version and still on test support only IPv4. We are working to add support for IPv6 UDP Port check. If you found a bug please use the contact page to report. Thanks for that.


Domain/IP:  Port:  


Some Known UDP Port:

Here are 3 known UDP Port that you can check using out UDP Port Checker tool.

  • 53Domain Name System (DNS).
  • 67 – Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) server
  • 111 – Open Network Computing Remote Procedure Call (RCP).


UDP Port Checker Online
UDP Port Checker Online | Image by user1518572209 from Pixabay


What is UDP?

The User Datagram Protocol – UDP is one of the core internet protocol. UDP uses a connectionless mechanism to transfer data, using a datagram packet. It provides checksum for data validation and can work on a selected port number.

UDP is faster but there are some considerations that you need to know before selecting the UDP model. The application may need to verify errors, as there are no guarantees (like in TCP). It will also need to verify which package arrive first to order it in a right way, aka add counter to the packet.

UDP Port Checker Tool:

Our tool is base on UDP. It creates a UDP packet on the desired port. The is trying to write to it. After it writes to it, it waits on a read to get data, if data is arrived before a time out it calculate the diff between the write and read. if there is a diff means the port is open.

This is not a fast tool to perform a port scanner but it can be helpful in checking UDP port status.

Please refer to our how to check UDP port status article for more information about UDP tools. The tools in the article are not runs from the online and need to be downloaded.