o6.mailservice.namecheap.com has no NS records.
NS records for this zone are defined at namecheap.com.
NS records for this zone are defined at namecheap.com.
Question and response
Question
dig o6.mailservice.namecheap.com. NS
Answer
The response has no answer records.
Authority
namecheap.com. 3600 SOA edns.registrar-servers.com. support.namecheap.com. 1770891650 28800 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0