shell:$ nslookup -timeout=2 -retry=1 'bootstrap.his.msappproxy.net'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
bootstrap.his.msappproxy.net	canonical name = bootstrap-nam1.his.msappproxy.net.
bootstrap-nam1.his.msappproxy.net	canonical name = nam.bootstrap-pta-1.his.msidentity.com.
nam.bootstrap-pta-1.his.msidentity.com	canonical name = www.tm.nam.bootstrap-pta-1.his.trafficmanager.net.
www.tm.nam.bootstrap-pta-1.his.trafficmanager.net	canonical name = bootstrap-pta-eus-bl2p-1.his.msappproxy.net.
Name:	bootstrap-pta-eus-bl2p-1.his.msappproxy.net
Address: 151.206.83.94