a1v.starfall.com has no NS records.
NS records for this zone are defined at starfall.com.
NS records for this zone are defined at starfall.com.
Question and response
Question
dig d1z1tv13m66uwg.cloudfront.net. NS
Answer
The response has no answer records.
Authority
cloudfront.net. 60 SOA ns-418.awsdns-52.com. hostmaster.cloudfront.net. 1377556270 16384 2048 1048576 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0