https://uptimerobot.com/free-tools/soa-lookup/
SOA Lookup Tool – Check Start of Authority (SOA) Record | UptimeRobot
Free SOA lookup for any domain. View the primary nameserver, serial number, refresh/retry/expire timers, and TTL to troubleshoot DNS zones fast.
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https://docs.bluecatnetworks.com/r/Address-Manager-Administration-Guide/Adding-Start-of-Authority-records/26.1.0?contentId=qrHoDf1JwUVBvsr9bNmJWA
Adding Start of Authority records - User Guide - BlueCat Integrity - 26.1.0
Start of Authority (SOA) records define administrative information for a DNS zone. Every zone you create uses default values for the SOA resource record...
start of authorityuser guideaddingrecordsbluecat