The State of IPv6 support on the Tor network | Tor Project
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In our last article, published in RIPE's website, we described the work that happened in 2020 related to giving IPv6 support to the Tor network. Tor 0.4.5.1-alpha is the first release that includes all the work described in the RIPE article. Relays running 0.4.5.1-alpha are the first to report IPv6 bandwidth statistics.

As of December 2, 2020, 54% of the relays on the network run a version of Tor that supports IPv6. Of the 6852 relays in the network, 3587 are running version 0.4.4 and 8 relays are running the latest Tor version 0.4.5. From all those, 1588 are announcing an IPv6 address and port for the OR protocol. 1587 relays are reachable on IPv6 by the directory authorities. 626 permit exiting to IPv6 targets.