====== DNS Integrity Check ======
NIOS [[https://docs.infoblox.com/space/NAG8/22251691/About+DNS+Integrity+Check+for+Authoritative+Zones|can compare]] its external authoritative zone data with the SOA/NS records in the parent and alert when they change (i.e. domain hijack)

It does not work with a stealth master, which may limit its usefulness in the external DNS context.