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-g2.tm-4.office.com.
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.13
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.35
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.38
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.21
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.11
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.30
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.49
Name:	eop-g2.tm-4.office.com
Address: 52.102.103.41
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9baa::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9b9b::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9b82::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9ba5::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9ba2::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9bb4::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9b84::365:f0be
Name:	eop-g2.tm-4.office.com
Address: 2a01:111:f403:9b95::365:f0be