How to check the connection of the house to the Internet provider in php?

Question

Computer networks

For a long time, I was interested in the question of how to implement a check for the presence of an Internet provider in the house. The city, address and house number are indicated - it gives the result whether the house is connected to the provider or not and accordingly offers an application form. There is really nothing like that on the Internet .. I would like to see an example from which you can build on.
How to implement such a check by connecting a database with addresses?
Attached some examples:
www.telenet.ru/check_connection.php
www.vegatele.com/rus/for_home/phone/check
www.onlime.ru/connect/0

Answer 1

providers each have their own database of addresses to which they have or plan to connect.

Answer 2

1. Each provider has forms for checking houses. You can try to parse these forms. However, the option is not the most reliable.
2. There is a 2gis.ru service that provides this information and, as far as I know, provides an API for accessing it. True, it's not free.