Why does the router refer to the old domain and hosting when changing the domain and hosting?

Question

Domain Name System

Dear friends, hello.
There was a rather strange situation - the domain and the site were transferred from one hosting to another (NIC.ru > Gino). After that, everything worked correctly, except for the office - in which there are 2 routers (Main (normal) + wifi). He stubbornly refers to the old hosting using the old DNS of the old domain location.
In confirmation of this, it gives an error on the directory, which was only on the old hosting.

From all other devices everything works correctly. The router is a problem: Asus, I can’t say the exact model, it’s too old. Rebooting the router did not change the situation.

Guys, what can I do to solve the problem?
Thanks in advance for any response.

Answer 1

https://linux.die.net/man/1/dig it will show you the IP source from which DNS the crooked record is given to you.

Answer 2

Ping the domain from the office, you will see ip.
If the ip differs from the real one, try:
1) Register the main DNS on the router: 8.8.8.8
2) Turn off the router
3) Run on the computer in the command line: ipconfig /flushdns
4) Restart the computer
5) Turn on the router
The sequence is important!