162.158.255.212 - this IP is from cloudflare?

From here: IP Ranges
it says IP block: 162.158.0.0/15 is from Cloudflare.

BUT in my nginx log, I see:
162.158.255.212 - - [23/Feb/2021:01:50:14 -0500] “GET /lengxiaohua/21560.html HTTP/2.0” 200 5784 “-” “Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)”

I block the spider “sogou”.

Cloudflare sending me emails about: [Error 521: Web server is down]

Yes, that’s an IP address for a Cloudflare Proxy server. If your server isn’t restoring visitor IP addresses, that’s what you’ll see.

https://support.cloudflare.com/hc/en-us/articles/200170786-Restoring-original-visitor-IPs-logging-visitor-IP-addresses

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