shell:$ nslookup -timeout=2 -retry=1 'eur03.safelinks.protection.outlook.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
eur03.safelinks.protection.outlook.com	canonical name = eop.mira.tm.svc.cloud.microsoft.
eop.mira.tm.svc.cloud.microsoft	canonical name = acdcatm.eop.mira.tm.svc.cloud.microsoft.
acdcatm.eop.mira.tm.svc.cloud.microsoft	canonical name = svc.ms-acdc-eop.office.com.
Name:	svc.ms-acdc-eop.office.com
Address: 52.102.103.6
Name:	svc.ms-acdc-eop.office.com
Address: 52.102.103.46
Name:	svc.ms-acdc-eop.office.com
Address: 52.102.103.31
Name:	svc.ms-acdc-eop.office.com
Address: 2a01:111:f403:9b84::365:f0be
Name:	svc.ms-acdc-eop.office.com
Address: 2a01:111:f403:9ba8::365:f0be
Name:	svc.ms-acdc-eop.office.com
Address: 2a01:111:f403:9bb5::365:f0be
Name:	svc.ms-acdc-eop.office.com
Address: 2a01:111:f403:9b99::365:f0be