How does TOR (The Onion Router) maintain a list of servers, that are publicly available to everyone, unblocked?
closed as off topic by Chris S, Ward♦, Shane Madden♦, Ben Pilbrow, John Gardeniers Oct 5 '11 at 10:16
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They don't. Tor does nothing to keep relays and exits from getting blocked. Read over this Exit Router template that they provide, particularly the last couple of paragraphs.
Anyone can take the list of nodes from https://check.torproject.org/cgi-bin/TorBulkExitList.py and block all of the IP addresses. I can also block all of the IP addresses allocated to China or Russia but do the losses justify the gains?
They do have entry points to the network called bridges that is secret in order for more people be able to use Tor.
They kind of cover it in their about section. https://www.torproject.org/about/overview.html.en