shell:$ nslookup -timeout=2 -retry=1 'your-config-id.dns.nextdns.io'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
your-config-id.dns.nextdns.io	canonical name = steering.nextdns.io.
Name:	steering.nextdns.io
Address: 155.138.130.135
Name:	steering.nextdns.io
Address: 188.172.221.9
Name:	steering.nextdns.io
Address: 2001:19f0:b001:1bb:5400:2ff:fec8:6dcc
Name:	steering.nextdns.io
Address: 2605:380:55:450::7