shell:$ nslookup -timeout=2 -retry=1 'u.airtel.in'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
u.airtel.in	canonical name = urlshortner.airtel.akadns.net.
Name:	urlshortner.airtel.akadns.net
Address: 125.21.240.72