shell:$ nslookup -timeout=2 -retry=1 'eur03.safelinks.protection.outlook.com'
Server:		75.98.161.224
Address:	75.98.161.224#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: 52.102.103.10
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.30
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.24
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.32
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.38
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.37
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.36
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 52.102.103.53
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9ba8::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b96::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9bb4::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b88::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b8f::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:f403:9b81::365:f0be
Name:	eop-mrc-ww-perf.tm-4.office.com
Address: 2a01:111:f403:9b94::365:f0be