_spf.out.byside.com has no NS records.
NS records for this zone are defined at byside.com.
NS records for this zone are defined at byside.com.
Question and response
Question
dig _spf.out.byside.com. NS
Answer
The response has no answer records.
Authority
byside.com. 3600 SOA ns-cloud-b1.googledomains.com. infra.byside.com. 2025101301 21600 3600 1209600 3600
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0