Check port availability online

                     IP                                           Port                      Start checking ->                                      
                     HTTP - 80                      SFTP - 115                      SMTP - 25                      HTTP - 8080                      FTP - 21                      SSH - 22                      IMAP - 143                      HTTPS - 443                      RSYNC - 873                      POP3 - 110                      IMAPS - 993                 

Checking the port for availability; checking for openness by ip address

             Checking the port for availability allows you to determine the level of protection of your computer from network scammers and hacker attacks. This can be done using special online services, knowing the unique number and address. After accessing the Internet, the device receives a personal IP from the provider, and becomes known by this unique number. Knowing the result of checking the port by IP address, it is easier to understand the "weaknesses" of the networks used and quickly fix the problems.             

What is a computer port

             Ports, the availability of which is determined by the scanner, are opened upon request when a certain program is about to interact with remote servers. As a result, connection to it becomes possible. Each port has its own reserved number - you can only check it. This is provided by TCP or IP protocol. So, if the browser connects to a port whose number matches the desired site, the browser receives encrypted data in response - this code is displayed as a web resource.                 Checking the IP ports for availability is allowed if an individual address is assigned to the computer or mobile device. You can check this information with your provider.             

What the port availability check shows

             As a result of checking for openness by IP address, the port may be:             
  • Closed. It indicates that it is impossible to connect to the port through the server now, respectively, the contents of the computer are reliably protected from hacker attacks and network fraudsters. Closed status indicates a high degree of confidentiality. If you want an inaccessible port to be open - the problem is in the incorrect configuration of the network connection or software. In such a situation, it is recommended to check the access rights to the necessary program.
  • open. The openness of the port indicates its accessibility to Internet users and that it is possible to connect to it using a remote server. If this is not required, you should check the running services - probably at this moment they use the port to access the network. A common reason for accessibility is exposure to malware. To avoid leaks of personal information, additionally check your computer for viruses.
             When checking ports on the server, it is important to consider: if the gadget is connected to the network via a Wi-Fi router, the results of the availability scan apply directly to the router. You can check the openness inside the subnets by doing a forwarding. This process is the configuration of a router, after which user requests from the Internet are redirected to computers connected to the local network.                 You can check the availability of ports by ip address on your device or using special programs. The second option is preferable, because, in addition to checking openness, many free utilities show other important information: server location, speed of loading web pages, privacy level, ping, etc.              

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