Certainly, here's the provided information translated into English:

A subnet calculator app is a tool that calculates subnetting of a network based on IP address, subnet mask, and various network parameters. This application is utilized by network engineers, system administrators, students, educators, and IT professionals for network design, management, or learning.

Here are the key features typically offered by a subnet calculator app:

1. **IP Address & Subnet Mask Calculation**:
- The app provides information about the network (like network address, broadcast address, etc.) when users input an IP address and subnet mask.

2. **Support for CIDR Notation**:
- It can calculate and provide subnet information using CIDR (Classless Inter-Domain Routing) notation.

3. **Calculating Available IP Address Range**:
- The app calculates and provides the range of available IP addresses for the given network address and subnet mask.

4. **Subnet Division**:
- The app helps to manage and operate by dividing a large network into smaller subnets.

5. **UI Features**:
- Through a simple and intuitive user interface, it helps users easily input parameters and interpret results.

These features allow users to effortlessly perform complex network calculations and enable efficient network design and management.