shell:$ nslookup -timeout=2 -retry=1 'stun.voip.blackberry.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
stun.voip.blackberry.com	canonical name = stun.voip.dyn.blackberry.net.
stun.voip.dyn.blackberry.net	canonical name = na-default-stun-voip-azure.dyn.blackberry.net.
na-default-stun-voip-azure.dyn.blackberry.net	canonical name = na-stun-voip-azure.dyn.blackberry.net.
Name:	na-stun-voip-azure.dyn.blackberry.net
Address: 20.14.234.57