Thanks all.
Given that traceroute can reach Zayo and Zayo appears to have route to Treasury's AS13506, is it reasonable to assume this is on Treasury's end, potentially blocking traffic from VZ's AS701?

@John Lightfoot: Yes, they rolled out largely throughout last year.

On Wed, May 17, 2023 at 3:24 PM John Lightfoot <jlightfoot@gmail.com> wrote:

Verizon has IPv6?

 

From: NANOG <nanog-bounces+jlightfoot=gmail.com@nanog.org> on behalf of Jay Hennigan <jay@west.net>
Date: Wednesday, May 17, 2023 at 3:21 PM
To: nanog@nanog.org <nanog@nanog.org>
Subject: Re: Treasurydirect.gov unreachable over IPv6?

On 5/17/23 11:30, holow29 wrote:
> Is anyone able to reach treasurydirect.gov <http://treasurydirect.gov>
> over IPv6? Unable to do so over Verizon Fios, and I'm not sure if it is
> a routing issue or an issue on Treasury's end.

Reachable from AS4927 in California.

--
Jay Hennigan - jay@west.net
Network Engineering - CCIE #7880
503 897-8550 - WB6RDV