We measure total available bandwidth and current capacity by aggregating what relays and bridges report to directory authorities.
This graph shows total advertised bandwidth by relays supporting IPv6 as compared to all relays. A relay can support IPv6 by announcing an IPv6 address and port for the OR protocol, which may then be confirmed as reachable by the directory authorities, and by permitting exiting to IPv6 targets. In some cases, relay sets are broken down by whether relays got the "Guard" and/or "Exit" relay flags indicating their special qualification for the first or last position in a circuit. These sets are not distinct, because relays can have various combinations of announced/confirmed OR ports, exit policies, and relay flags.
This material is supported in part by the National Science Foundation under Grant No. CNS-0959138. Any opinions, finding, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. "Tor" and the "Onion Logo" are registered trademarks of The Tor Project, Inc.. Data on this site is freely available under a CC0 no copyright declaration: To the extent possible under law, the Tor Project has waived all copyright and related or neighboring rights in the data. Graphs are licensed under a Creative Commons Attribution 3.0 United States License.