Lots of strange guest IPs

Over the past 4 days, I have noticed about 100-130 more guests online and they all have Singapore IPS or France ones, in this format - ec2-13-251-67-188.ap-southeast-1.compute.amazonaws.com They are all amazonaws. We have two step verification set up for admin but is there anything else I need to do? Should I be worried about this? Thank you for any help.
Thank you, there are Bing and Petal robots showing though but these are coming up as guests.

Is it anything to worry about?
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