Coudgflare ip block blocking by possible attack or rules

Coudgflare ip block blocking by possible attack or rules
Hi? Has anyone experienced this problem, I have several logs of a block of ips being blocked by the firewall this one uses Cloudflare:
lfd on cloud.hostcuritiba.net.br: blocked 172.71.147.62 (-)

this block: 172.0.0.0 is being blocked every second on our server. I would like to know what may be happening with this ip, is this possible attack?

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