shell:$ nslookup -timeout=2 -retry=1 'a.tile.openstreetmap.org'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
a.tile.openstreetmap.org	canonical name = dualstack.n.sni.global.fastly.net.
Name:	dualstack.n.sni.global.fastly.net
Address: 146.75.9.91
Name:	dualstack.n.sni.global.fastly.net
Address: 2a04:4e42:72::347