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A comment on I can see your local web servers. Parent comment

Re:I can see your local web servers by dredmorbius on Tuesday May 28, 2019 @05:13PM (#20034486)
Add all the RFC1918 unroutable private networks.

https://en.wikipedia.org/wiki/Private_network

    10.0.0.0 – 10.255.255.255 (10.0.0.0/8)
    172.16.0.0 – 172.31.255.255 (172.16.0.0/12)
    192.168.0.0 - 192.168.255.255 (192.168.0.0/16)
    127.0.0.0 - 127.255.255.255 (127.0.0.0/8)
https://tools.ietf.org/html/rfc1918

Possibly also 100.64.0.0/10 for carriers.

https://tools.ietf.org/html/rfc6598#page-8

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Re:I can see your local web servers by johnp_ on Wednesday May 29, 2019 @07:32PM (#20046832)
Possibly also the IPv6 ULAs:

https://en.wikipedia.org/wiki/Unique_local_address

Not sure if those can be expressed in uMatrix as a prefix rule.

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