Unknown IP addresses in firewall logs

[Matt T-]

I'm sorry if this is not the correct forum for this question, but I couldn't find another forum which seemed more appropriate.

I have noticed some mysterious IP addresses appearing in the firewall logs for our Windows 2016 servers. I have determined these are IP addresses owned by Microsoft but I can't seem to find them documented anywhere - I would like to know what is behind these addresses so we can assess whether they are important / should be allowed through our firewall.

157.55.134.136
157.55.134.138
157.55.134.140
157.55.134.142
157.55.135.128
157.55.135.130
157.55.135.132
157.55.135.134
20.44.86.43
52.158.208.111
65.55.163.76
65.55.163.78
65.55.163.90
65.55.163.91

Thanks.

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