sp4.zaptail.com has no NS records.
NS records for this zone are defined at zaptail.com.
NS records for this zone are defined at zaptail.com.
Question and response
Question
dig sp4.zaptail.com. NS
Answer
The response has no answer records.
Authority
zaptail.com. 1200 SOA ns1.dnsexit.com. admin.netdorm.com. 2000060701 86000 180000 1814400 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0