spf1.owenscorning.com has no NS records.
NS records for this zone are defined at owenscorning.com.
NS records for this zone are defined at owenscorning.com.
Question and response
Question
dig spf1.owenscorning.com. NS
Answer
The response has no answer records.
Authority
owenscorning.com. 3600 SOA ns1.owenscorning.com. hostmaster\@owenscorning.com. 2014112614 3600 600 86400 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0