Whatever you set them to - you can change the ports to what you need.
The defaults for off-the-shelf server installs (but not development etc) are 8080 for JIRA, 8090 for Confluence, 8091 for Synchrony (for Confluence), 7990 for Bitbucket
Hipchat is a bit more of a fuss and I can't remember them all. See https://confluence.atlassian.com/hc/system-requirements-for-hipchat-server-606306343.html
They have to be different, just in case someone tries to install more than one on the same machine! That's something a lot of us do, for development and testing at least.
If you're not sure where to look, try a simple "netstat" command on the servers, that can tell you what ports are listening.
From the outside, I'd use nmap to scan ports, but that can be seen as an attack, so check with your network guys before you do it.
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