MOQtail IBC2025

MOQtail

ord.ibc25.moqtail.dev:443

Sweep of 2026-11-08 01:20 UTC Latest report JSON

Identifies itself as: did not say
Measured: 2026-11-08 01:24 UTC
Measured from: Helsinki, Finland
Probe: moqtap-probe 0.7.0 (ee97a7ac6179)
Drafts negotiated: draft 11

WT IPv4

A deployment of MOQtail. About this endpoint

At a glance

Protocols accepted: h3
Media delivery: Namespace accepted, track never asked for
Violations recorded: 1

Certificate

Subject: CN=ibc25.moqtail.dev
Issuer: C=US, O=Let's Encrypt, CN=YE1
Valid until: 2026-12-28 51 days left when measured
Trust: Publicly trusted
Verification: Completed with the certificate verified

Control messages

What each request got back, per draft. ok and err are both answers; ✗ is a request refused or left unanswered; a dash is a request our side did not complete. Times run from the request to its answer; each request waited up to 3,000 ms.

Draft	SUBSCRIBE	FETCH	TRACK_STATUS	SUBSCRIBE_NAMESPACE	PUBLISH_NAMESPACE	SUBSCRIBE_TRACKS	PUBLISH
11 WT	✓ err 124 ms	✓ err 122 ms	✗ 3,000 ms	✗ 3,000 ms	✓ ok 122 ms	·	·

SUBSCRIBE · draft 11 · WT SUBSCRIBE_ERROR 4 “Unknown track namespace”.
FETCH · draft 11 · WT FETCH_ERROR 4 “Track does not exist”.

Media delivery

One publisher and two subscribers, to see whether an object published through this endpoint reaches a client that asked for it.

Namespace accepted, track never asked for draft 11 · WebTransport

The subscription routed to the publisher could not be read. The endpoint broke a rule of the draft: each new request must carry the next Request ID in the sender's sequence.

Two publishers of one track

Two publishers announce the same namespace and publish the same tracks, one with identical payloads and one with payloads that differ by publisher. Partway through, the publisher serving the subscribers disconnects without notice. A fresh subscription, sent afterwards, shows whether the remaining publisher could still be reached.

The relay closed a serving publisher’s session early draft 11 · WebTransport

Publisher	Role	Announcement	Subscribed to	Ended by the relay
first publisher	closed The relay closed its session while the other publisher was present.	accepted, ANNOUNCE_OK in 115 ms	—	Session ended: an unreadable reply
second publisher	standby The relay accepted it and never subscribed to it while a subscriber was waiting.	accepted, ANNOUNCE_OK in 130 ms	—	—

Track	Objects	From	When the publisher left	Ended by
identical payloads	nothing arrived	—	not measured	—
differing payloads	nothing arrived	—	not measured	SUBSCRIBE_DONE 2 “Publisher disconnected”

Specification violations

Each new request must carry the next Request ID in the sender's sequence. request_id_out_of_sequence

Draft 11 over WebTransport, during the delivery run, routing the subscription

Specification: draft-ietf-moq-transport-11, Section 8.1; “If an endpoint receives a Request ID that is not valid for the peer, or a new request with a Request ID that is not expected, it MUST close the session with Invalid Request ID.”
Required response: close the session with Invalid Request ID (0x4)

Setup parameters

What this endpoint sent back in its setup response, per draft. A parameter with no name is a code point the negotiated draft does not define.

draft 11 · WT

0x02 max_request_id = 2305843009213694000

Measured by sweep

Sweep	Probe	Reachable	Drafts	Requests answered	Delivery	Offers a track	Certificate valid until	Violations	Two publishers
8 Nov 2026	0.7.0 ee97a7ac6179	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
7 Nov 2026	0.7.0 ee97a7ac6179	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
6 Nov 2026	0.7.0 ee97a7ac6179	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
5 Nov 2026	0.7.0 ee97a7ac6179	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
4 Nov 2026	0.7.0 0da3083d8bde	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
3 Nov 2026	0.7.0 fcd05c5302c4	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
2 Nov 2026	0.7.0 fcd05c5302c4	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
1 Nov 2026	0.7.0 fcd05c5302c4	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
31 Oct 2026	0.7.0 fcd05c5302c4	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
30 Oct 2026	0.7.0 fcd05c5302c4	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
29 Oct 2026	0.7.0 632a80524083	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	not attempted	2026-12-28	request_id_out_of_sequence 11 WT	no defects
27 Oct 2026	0.5.0 74c287bac814	yes	draft 11	11 WT: 3 of 5	Namespace accepted, track never asked for11 WT	—	2026-12-28	request_id_out_of_sequence 11 WT	—

Notes

— The endpoint is up and refused the offered protocols on at least one transport.

Is this your relay?

If something here is wrong, tell us — we keep what each result rests on, so a disputed one gets re-read rather than re-argued. We can also run this against endpoints that are not public.

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