shell:$ nslookup -timeout=2 -retry=1 'kelas-cdn.ruangguru.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
kelas-cdn.ruangguru.com	canonical name = kelas-cdn.ruangguru.com.eo.dnse5.com.
Name:	kelas-cdn.ruangguru.com.eo.dnse5.com
Address: 43.174.227.65
Name:	kelas-cdn.ruangguru.com.eo.dnse5.com
Address: 43.174.229.73