It is now out of date that Tor servers are required to have port 80 IPv4 open, even if limited to a single Class A network in order that the relay can be labelled as an exit.  Port 443 should be enough. 

For reasons I do not understand, if I open port IPv4 80 to a wider range I get abuse notices within a day, usually DMCA, as if some man in the middle is scanning the html!  So far, wide open IPv6 port 80 attracts zero attention from those alleging abuse.  

http://example.com  called as an IPv4 address cannot be reached by my tor exits as port 80 IPv4 too limited.  Port 443 IPv4 and IPv6 on my exits are wide open to all, and we should all be on https anyway.   https://example.com can be reached from my exits.   Example.com does have an IPv6 address so in theory can be reached from my exits on port 80 as IPv6 port 80 is wide open    I assume not used as the DNS requested for example.com gives IPv4 address.

Can an Exits now be defined as an exit with port 443 open IPv4?   And then tested that is an exit with https requests not http.

Gerry Bulger