available.dsl.net has no NS records.
NS records for this zone are defined at dsl.net.
NS records for this zone are defined at dsl.net.
Question and response
Question
dig available.dsl.net. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0