_spf2.arrow.com has no NS records.
NS records for this zone are defined at arrow.com.
NS records for this zone are defined at arrow.com.
Question and response
Question
dig _spf2.arrow.com. NS
Answer
The response has no answer records.
Authority
arrow.com. 86400 SOA pdns77.ultradns.com. domadmin.arrow.com. 2019104130 43200 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0