My CentOS 7 apparently came with ports 10010-10020/tcp, and services ssh and dhcpv6 open on the public zone, the default active zone.
You should specify which zone you are asking about, as there are 9 predefined zones, as of v.0.6
8083 and 8086 are both used by ITunes, according to this source.
One of the first tasks when setting up a server connected to the internet is to configure the firewall. In my case, for example, it was a VPS that should only be accessed from my home network, so I activated and opened the home zone to my local network IPs, and closed the (default) public zone to everything, loosely following this guide.