shell:$ nslookup -timeout=2 -retry=1 'js.arcgis.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	js.arcgis.com
Address: 18.160.213.22
Name:	js.arcgis.com
Address: 18.160.213.61
Name:	js.arcgis.com
Address: 18.160.213.27
Name:	js.arcgis.com
Address: 18.160.213.82