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.
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