williamson.vispum.com has no NS records.
NS records for this zone are defined at vispum.com.
NS records for this zone are defined at vispum.com.
Question and response
Question
dig williamson.vispum.com. NS
Answer
The response has no answer records.
Authority
vispum.com. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1772468657 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0