smtp.dslextreme.com has no NS records.
NS records for this zone are defined at dslextreme.com.
NS records for this zone are defined at dslextreme.com.
Question and response
Question
dig dslextreme.com.av-mx.com. NS
Answer
The response has no answer records.
Authority
av-mx.com. 900 SOA ns1.neonova.net. hostmaster.neonova.net. 2026022400 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0