Static IP and dynamic IP are suitable for different scenarios, which mainly depends on the network requirements, device types and the nature of the service.

The following are some common scenarios for each of them:

Application scenarios of static IP address:

1. **Server**: When running a website, mail server or other services that require continuous access, using a static IP address can ensure that users can always access these services through the same address.

2. **Remote access and management**: When administrators need to remotely access or manage devices in the network from an external network, using a static IP address can ensure that the location of the device remains unchanged.

3. **VoIP phone system**: In order to ensure call quality and service stability, VoIP phones usually require static IP addresses to reduce the possibility of connection interruptions.

4. **Online games**: Some online games require players to use static IP addresses so that game servers can more effectively manage and track players' activities.

5. **File sharing and FTP servers**: Static IP addresses allow users to access file sharing and FTP servers from anywhere without worrying about changes in IP addresses.

6. **Security cameras and other surveillance devices**: Fixed IP addresses allow users to view live video streams from remote locations and ensure the continuity of video streams.

Application scenarios of dynamic IP addresses:

1. **Home network**: Home users' Internet connections are usually assigned dynamic IP addresses because home users do not need fixed public IP addresses.

2. **Small business**: For small businesses that do not provide public services, dynamic IP addresses are sufficient to meet daily Internet needs.

3. **Mobile devices**: Portable devices such as mobile phones and laptops usually use dynamic IP addresses because they need to obtain new IP addresses when accessing the network at different locations.

4. **Temporary network settings**: When setting up a temporary LAN or wireless network, dynamic IP addresses provide a convenient configuration method and reduce the workload of manually assigning IP addresses.

5. **Large-scale network**: Large organizations or ISPs may choose to use dynamic IP addresses to more efficiently manage a large number of IP address resources because not all devices need to be online at the same time.

6. **DHCP network**: When a DHCP server is deployed in the network, network devices usually automatically obtain dynamic IP addresses, simplifying network management.

In short, static IP addresses are more suitable for environments that require a stable and predictable network identity, while dynamic IP addresses are suitable for more flexible application scenarios with a high tolerance for IP address changes.