shell:$ nslookup -timeout=2 -retry=1 'detectportal.firefox.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
detectportal.firefox.com	canonical name = detectportal.prod.mozaws.net.
detectportal.prod.mozaws.net	canonical name = prod.detectportal.prod.cloudops.mozgcp.net.
Name:	prod.detectportal.prod.cloudops.mozgcp.net
Address: 34.107.221.82
Name:	prod.detectportal.prod.cloudops.mozgcp.net
Address: 2600:1901:0:38d7::