shell:$ nslookup -timeout=2 -retry=1 'directline.botframework.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
directline.botframework.com	canonical name = bc-directline.trafficmanager.net.
bc-directline.trafficmanager.net	canonical name = bc-directline-eus2.azurewebsites.net.
bc-directline-eus2.azurewebsites.net	canonical name = waws-prod-bn1-031.vip.azurewebsites.windows.net.
waws-prod-bn1-031.vip.azurewebsites.windows.net	canonical name = waws-prod-bn1-031.eastus2.cloudapp.azure.com.
Name:	waws-prod-bn1-031.eastus2.cloudapp.azure.com
Address: 40.84.54.203