spf1.broadridge.com has no NS records.
NS records for this zone are defined at broadridge.com.
NS records for this zone are defined at broadridge.com.
Question and response
Question
dig spf1.broadridge.com. NS
Answer
The response has no answer records.
Authority
broadridge.com. 3600 SOA edns1.ultradns.com. enterprisedns.broadridge.com. 2026011212 600 3600 691200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0