Русский 
English Checking port availability and openness by IP address
Port availability check allows determining the level of computer protection against network fraudsters and hacker attacks. This can be done using special online services, knowing the unique number and address. After connecting to the Internet, the device receives a personal IP from the provider and becomes known under this unique number. Knowing the result of the port check by IP address makes it easier to understand the “weak” sides of the networks used and quickly resolve problems.
What is a computer port
Ports, the availability of which is determined by the scanner, are opened on request when a certain program is going 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 coincides with the desired site, the browser receives encrypted data in response – this code is displayed as a web resource. Checking ports by IP for availability is allowed if the computer or mobile device is assigned an individual address. You can clarify this information with your provider.
What does the port availability check show
As a result of the openness check by IP address, the port may be:
- Closed. Indicates that it is currently impossible to connect to the port through the server, accordingly, the computer’s contents are reliably protected from hacker attacks and network fraudsters. The “closed” status shows a high degree of confidentiality. If you need an inaccessible port to be open – the problem is in incorrect network connection or software settings. In this situation, it is recommended to check the access rights to the necessary program.
- Open. The openness of the port indicates its availability to Internet users and that it can be connected to using a remote server. If this is not required, you should check the running services – they are probably using the port to access the network at this moment. A common cause of availability is the impact of malicious software. To avoid personal information leaks, additionally check your computer for viruses.
When checking ports on the server, it’s important to consider: if the gadget is connected to the network via a Wi-Fi router, the scan results for availability relate directly to the router. You can check the openness within subnets by performing port forwarding. This process involves configuring the router so that 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, web page loading speed, privacy level, ping, etc.
Checking port by IP address
Using our service, you can quickly check the port by IP for availability online and determine the readiness of the website to receive connections. To start the check, it’s enough to enter the address in the corresponding field. The scanner will show not only openness and closedness but also the program that uses the port. Our site works with both TCP and UDP versions. After performing a port availability check, you can also learn the current Internet connection speed, the IP address of a specific site, and the geographical data of the server. This information will help identify and resolve network issues.
