spf.tricorn.net has no NS records.
NS records for this zone are defined at tricorn.net.
NS records for this zone are defined at tricorn.net.
Question and response
Question
dig spf.tricorn.net. NS
Answer
The response has no answer records.
Authority
tricorn.net. 3600 SOA ns000.d-53.net. infra-general.tricorn.co.jp. 2025101001 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0