shell:$ nslookup -timeout=2 -retry=1 'a.ns.hackerone.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	a.ns.hackerone.com
Address: 162.159.0.31
Name:	a.ns.hackerone.com
Address: 2400:cb00:2049:1::a29f:1f