lyon.forsup.net has no NS records.
NS records for this zone are defined at forsup.net.
NS records for this zone are defined at forsup.net.
Question and response
Question
dig lyon.forsup.net. NS
Answer
The response has no answer records.
Authority
forsup.net. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1773791036 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0