The Bharti Airtel is the largest cellular service provider; which also provides telephone services and broadband Internet access (DSL) in top 95 cities in India.
Airtel ISP use the following dns server IP address:
Please note that if you receive your IP addresses dynamically, you should use the dynamically assigned DNS servers. They are assigned based on which servers will provide you with the best response time. However, above dns caching name server should work without any problem.