whois lookup shows correct ip but why my browser cant find ip of domain? : I am facing very strange situation.

my website suddenly stooped working.

when i search for the domain name in WHOIS websites its showing the correct server ip address and correct DNS IP address.

I can reach the website by its IP address but somehow when i am trying domain name in browser its not working and its showing "This site can’t be reached"!!

There is no error in my server log.
I tried different browser and different system and its same issue.

I am really confused. even when i am sending GET request with Postman to my domain it not reachable but sending request to IP is working!