IPCheck: An online tool to detect IP availability and port availability (IP blocked detection)

When we purchase a foreign VPS, we sometimes encounter situations where the IP is unavailable and cannot be connected. At this time, we need to use a tool to test whether the IP is blocked or the firewall port is not open, causing the connection failure. Question, today we will share with you an online IP blocked detection tool that can be used to test IP availability and port availability in mainland China.

1. Introduction to IPCheck tool

Tool address: IP availability detection tool

Ping is based on the ICMP protocol, so if the host IP can be pinged, it means that the ICMP protocol is available; if TCP is available, it means that the services of your port are available, including SSH, MySQL database services, etc. Therefore, sometimes the VPS host can ping successfully, but SSH cannot connect. This means that the ICMP protocol of the IP is available, but the TCP protocol is blocked.

The IP availability detection tool will test the IP availability in mainland China and abroad at the same time. If ICMP is available, it means that the IP can be pinged in this area. If TCP is available, it means that the service of this port is available.

2. Tutorial on using IPCheck tool

Open the tool: https://www.toolsdaquan.com/ipcheck/, IPCheck supports IP detection and domain name detection.

1. IP detection

Enter the IP address of the VPS to be detected, and the port for service monitoring. For example, SSH is generally 22, and the website port service is 80 (http) and 443 (https). Click to start detection:

2. Domain name detection

The same applies if you need to detect the domain name. Enter the domain name and port for detection, and click to start detection:

3. Interpretation of results

IP availability detection tools generally have the following test results:

• Available in mainland China and abroad: this IP is available normally;
• Available abroad, not available in mainland China: This IP (or port service) cannot be used in mainland China;
• Not available in mainland China or abroad: Check whether the host is down or whether Ping is disabled (ICMP is not available), and whether the host needs to manually open the firewall (TCP is not available).

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