Yes ! 8333. I've seen some communications on internet that AT&T doesn't allocate any static address to its customers. Some businesses have to pay for it
For most ISPs, their modem definitely would have a firewall which blocks most of the ports. Can't you portforward the ports?[1]The port you should be portforwarding is TCP/8333 and you have to find your own internal IP address. To do that, you have to go to System Preferences>Network and press the tab which you have connection to on your Mac. You should see your internal IP there.
[1] https://forums.att.com/t5/AT-T-Internet-Equipment/Port-Forwarding-on-the-Arris-NVG589-Gateway/td-p/4043506
Thank you very much for your attemp to help me..I've tried everything per your instructions and the link - the Xbox 360 setup NAT/ game created 4 ports and pass through still no prevail...
I did some research, apparently AT&T hide and close my ports base on the description below...it's late and I'm very tired. I've tried for the last 3,4 days. I hope somebody here could help me to finally open my bitcoin full node, it would be nice ! As I understand it, I may be able to purchase or rent for private IPs from AT&T . I would hate to give them that satisfaction...
None of my ports work for bitcoin, they are all hidden via a private subnet, so literally the internet cannot see them. They use one of the few private IPs available, completely non-routable for other computers trying to connect directly ( https://www.arin.net/knowle... )
