ndns1.cosmotown.com has no NS records.
NS records for this zone are defined at cosmotown.com.
NS records for this zone are defined at cosmotown.com.
Question and response
Question
dig ndns1.cosmotown.com. NS
Answer
The response has no answer records.
Authority
cosmotown.com. 900 SOA ns-844.awsdns-41.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0