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 = eop-mrc-ww-perf.tm-4.office.com.
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.21
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.43
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.29
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.46
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.2
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.0
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.44
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.40
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9ba0::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9bad::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b91::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b8b::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9ba6::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b92::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b9c::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b93::365:f0be