apphelp.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 d232419e3a5a8d80.vercel-dns-016.com. NS
Answer
The response has no answer records.
Authority
vercel-dns-016.com. 900 SOA ns1.vercel-dns-016.com. awsdns-hostmaster.amazon.com. 1 3600 900 1209600 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0