It looks like just using "Listen 80" on our system below defaults to IPv6. We do not have an IPv6 network. But on one of our web servers the web site is accessible. At the moment, to me, it looks like that should not be possible.
When we explicitly put in the ip address, Listen 111.22.33.444:80, it also works over IPv4, and that is what we will do, but I was just curious.
Apache 2.4.6
Red Hat 7
In httpd.conf …
Listen 80
netstat -an | grep LISTEN
tcp6 0 0 :::80 :::* LISTEN
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