shell:$ nslookup -timeout=2 -retry=1 'app.docu-tools.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	app.docu-tools.com
Address: 3.168.40.21
Name:	app.docu-tools.com
Address: 3.168.40.4
Name:	app.docu-tools.com
Address: 3.168.40.101
Name:	app.docu-tools.com
Address: 3.168.40.11