shell:$ nslookup -timeout=2 -retry=1 'app.docu-tools.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	app.docu-tools.com
Address: 13.225.196.64
Name:	app.docu-tools.com
Address: 13.225.196.104
Name:	app.docu-tools.com
Address: 13.225.196.50
Name:	app.docu-tools.com
Address: 13.225.196.16