ns4.active.com has no NS records.
NS records for this zone are defined at active.com.
NS records for this zone are defined at active.com.
Question and response
Question
dig ns4.active.com. NS
Answer
The response has no answer records.
Authority
active.com. 600 SOA ns1.active.com. hostmaster.active.com. 2013062786 3600 3600 259200 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0