mail.worldsite.ws has no NS records.
NS records for this zone are defined at worldsite.ws.
NS records for this zone are defined at worldsite.ws.
Question and response
Question
dig mail.worldsite.ws. NS
Answer
The response has no answer records.
Authority
worldsite.ws. 86400 SOA ns2.dns.ws. hostmaster.ns2.dns.ws. 2025091801 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0