Hello EcoAxis
Should I remove them manually?
You may need to manually remove the old reverse records associated with workstations that have moved to the new subnet. These records are no longer valid in the new subnet and can cause DNS resolution issues if they are not removed.
DNS records typically don't update automatically when devices move between subnets because DNS servers may not be aware of the new network topology. So, manually managing and cleaning up old records is often necessary when you make significant network changes like this.
Best regards,
Karlie Weng