ns1.iad1.VPLS.NET has no CNAME records.
Question and response
Question
dig ns1.iad1.VPLS.NET. NS
Answer
The response has no answer records.
Authority
iad1.VPLS.NET. 8909 SOA ns1.VPLS.NET. support.VPLS.NET. 2025060401 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0