_radsec._tcp.openroaming.eduroam.uk has no NS records.
NS records for this zone are defined at eduroam.uk.
NS records for this zone are defined at eduroam.uk.
Question and response
Question
dig _radsec._tcp.openroaming.eduroam.uk. NS
Answer
The response has no answer records.
Authority
eduroam.uk. 3600 SOA ns11.ja.net. hostmaster.ns11.ja.net. 2016110210 43200 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0