docs.voicearchive.com has no NS records.
NS records for this zone are defined at voicearchive.com.
NS records for this zone are defined at voicearchive.com.
Question and response
Question
dig phs.getpostman.com. NS
Answer
The response has no answer records.
Authority
getpostman.com. 900 SOA ns-833.awsdns-40.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0