IPv4 Private Address Space and Filtering - American …
https://www.arin.net/reference/research/statistics/address_filters/
In August 2012, ARIN began allocating “172” address space to internet service, wireless, and content providers. There have been reports from the community that many network operators are denying access to devices having IP addresses from within the entire 172 /8 range. As a result, any device with a 172.x.x.x IP address may have difficulty reaching some sites on the …
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