shell:$ nslookup -timeout=2 -retry=1 'api.onesignal.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	api.onesignal.com
Address: 104.17.111.223
Name:	api.onesignal.com
Address: 104.16.160.145
Name:	api.onesignal.com
Address: 2606:4700::6810:a091
Name:	api.onesignal.com
Address: 2606:4700::6811:6fdf