It can be anything! An apex, subdomain, or even a URL.

Results forns-1926.awsdns-48.co.uk

Resolver

Location

A

Name	TTL	Value
ns-1926.awsdns-48.co.uk	172800	205.251.199.134AWS Route 53 (GLOBAL) / Amazon.com

Name	TTL	Value
ns-1926.awsdns-48.co.uk	172800	2600:9000:5307:8600::1Amazon Technologies Inc. (GLOBAL) / Amazon.com, Inc.