Generally speaking, if you find that the IP is still unusable after using it, it may be because the IP is occupied. How to check whether the IP is occupied? The following methods can be used for verification testing.

Detect whether the IP is occupied

To detect whether the IP is occupied, you can consider the following methods:

1. Send a ping packet: Use the ping command to send a data packet to the IP address. If no response is received, it may mean that the IP address is not in use, but it may also be blocked by the firewall. If a response is received, it may mean that the IP address has been occupied.

2. Port scanning: Use a port scanning tool (such as nmap) to scan whether the port of the IP address is open. If a port is open, it may mean that the IP address has been occupied.

3. Query WHOIS information: Use the WHOIS query tool to query the registration information of the IP address. If the registration information indicates that the IP address has been assigned to an organization or enterprise, it may mean that the IP address has been occupied.

4. Check the blacklist: Use the blacklist query tool to check whether the IP address is included in the blacklist. If it is included in the blacklist, it may mean that the IP address has been occupied or abused.

5. ARP cache method: The remote computer does not return a successful Ping message, but will tell the local computer the MAC address corresponding to the IP address. In this way, you can view it through the ARP cache information. If you can see the MAC address corresponding to the IP address, it means that the computer is online.

If the corresponding MAC address does not appear in the ARP cache table, it means that the computer is not online.

6. Batch method: Right-click on the desktop to create a new text file and enter the following code: FOR /L %%i IN (0,1,255) Do ping "IP address" %%i -n 1arp -a -> IP.txt Save the file as a .bat file. Double-clicking this batch file will automatically search for all IPs in the network segment and save the discovered ARP information to the ip.txt file. If the MAC address is returned, it means that they are online.

It should be noted that these methods cannot fully guarantee whether the IP is occupied, because there may be situations such as IP spoofing. Therefore, when using IP, it is best to choose a trusted service provider to avoid problems.

How to solve the problem of IP being occupied?

If you find that the IP has been occupied, you can consider the following solutions:

1. Change the IP address: If you have the authority to change the IP address, you can change it to another unoccupied IP address. This may require contacting your ISP or network administrator for help.

2. Find the owner of the IP address and contact: If you cannot change the IP address, you can try to find the owner of the IP address and contact them to request them to release the IP address. This may require some WHOIS queries or other network investigations to determine the owner of the IP address.

3. Use VPN instead of IP: If you cannot change the IP address or find the owner of the IP address, consider using VPN instead of IP to avoid conflicts. VPN will provide you with a new IP address and encrypt your network traffic to protect your online privacy and security.

It should be noted that when using a server, you should also abide by the server's usage rules and policies to avoid being blocked or abused. At the same time, you should also avoid using behaviors that may violate laws and regulations and maintain legal and compliant network behaviors.

Although IP occupation rarely occurs, if you want to avoid this situation, it is recommended to use high-quality IPs so that you can prevent this situation from happening at the root.

How to choose a high-quality IP?

1. Choose a reliable IP provider: Choose an IP provider with good reputation, rich experience, and good reputation to better ensure the quality and stability of the IP. It is best to choose a provider with a large number of providers, a wide coverage area, and good technical support and after-sales service.

2. Choose a stable IP: Choose an IP with a stable connection, because instability may cause network delays or connection loss. In addition, avoid choosing blocked or blacklisted IP addresses or servers.

3. Choose a fast IP: A fast IP can improve the network experience. You can test the speed through a speed test tool and choose one with a shorter response time.

4. Choose an anonymous IP: An anonymous IP can better protect the privacy and security of users. You can choose high anonymity to hide the user's IP address and identity, thereby protecting the user from being tracked by attackers.

5. Choose a suitable protocol: Common protocols include HTTP, HTTPS, SOCKS, etc. You can choose a suitable protocol according to specific usage needs and scenarios.

6. Choose an IP that supports the target website: Different IP addresses may have different access restrictions on target websites, so you need to choose one that supports the target website. For example, if the target website only allows HTTPS access, you need to choose one that supports HTTPS.

It should be noted that choosing a high-quality IP requires considering multiple factors and choosing it based on your specific needs.