shell:$ nslookup -timeout=2 -retry=1 'nexusrules.officeapps.live.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
nexusrules.officeapps.live.com	canonical name = prod.nexusrules.live.com.akadns.net.
Name:	prod.nexusrules.live.com.akadns.net
Address: 52.111.229.43
Name:	prod.nexusrules.live.com.akadns.net
Address: 2603:1036:2404:1::c