Hi Walter:

On Sun, 6 Aug 2017 19:45:22 +0200 Walter Alejandro Iglesias wrote:
> What determines those "ranges", who regulates that?

Some ISPs submit IP blocks to various blacklists. e.g:
https://www.Spamhaus.Org/faq/section/Spamhaus%20PBL#242
http://www.Sorbs.Net/faq/dul.shtml

Asking your ISP to exclude your addresses might help.

Regards,
-- 
Craig Skinner | http://twitter.com/Craig_Skinner | http://linkd.in/yGqkv7

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