internal.akam.net has no NS records.
NS records for this zone are defined at akam.net.
NS records for this zone are defined at akam.net.
Question and response
Question
dig internal.akam.net. NS
Answer
The response has no answer records.
Authority
akam.net. 180 SOA internal.akam.net. hostmaster.akamai.com. 1712081400 90000 90000 90000 180
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0