IETF | IETF 123 Madrid

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7 Nov 2025</p> <p class="lead fw-normal u-max-text-width">IETF 124 starts Saturday 01 November and runs through Friday afternoon, 07 November.</p> </div> </div> <div class="container"> <div class="row g-0 align-items-stretch justify-content-between"> <div class="col-12 col-lg-8 col-xl-9"> <div class="border-bottom border-primary py-4 px-3"> <div class="u-max-text-width"> <div class="block-paragraph"><p data-block-key="2cnqc">The聽<a href="/participate/runningcode/">IETF Hackathon</a>聽and聽<a href="/meeting/code-sprint/">IETF Codesprint</a>聽take place on the weekend. Events to help <a href="/meeting/new-participants/">new participants</a> get the most out of IETF meetings begin on Sunday afternoon. Participants should plan their travel accordingly. An <a href="/meeting/guide-ietf-meetings/">introduction to IETF meetings</a> provides an overview of how to prepare for and get the most out of sessions all week.</p></div> </div> </div> <div class="border-bottom border-primary p-3"> <h2 class="h4">Key details</h2> <div class="row"> <div class="col-12 col-lg-6"> <div class="my-3"> <button class="d-block btn btn-link p-0 w-100 border-0 text-start" data-bs-toggle="collapse" data-bs-target="#meeting-registration" aria-expanded="true" aria-controls="meeting-registration" aria-label="Meeting Registration - Click to toggle" > <h3 class="h5"> Meeting Registration<i class="bi bi-chevron-down ps-2"></i> </h3> </button> <div class="collapse show" id="meeting-registration"> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Register </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Registration Fee Waivers </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end"><a href="/meeting/terms-and-conditions/">Terms and conditions</a> </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Participant List </span> <span class="d-inline-block mb-2 ">Visa and LOI information </span> </div> </div> <div class="my-3"> <button class="d-block btn btn-link p-0 w-100 border-0 text-start" data-bs-toggle="collapse" data-bs-target="#participation-information" aria-expanded="true" aria-controls="participation-information" aria-label="Participation Information - Click to toggle" > <h3 class="h5"> Participation Information<i class="bi bi-chevron-down ps-2"></i> </h3> </button> <div class="collapse show" id="participation-information"> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Agenda </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end"><a href="/meeting/preparation/">Preparing for the meeting</a> </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Important dates and deadlines </span> <span class="d-inline-block mb-2 "><a href="/meeting/new-participants/">Information for new participants</a> </span> </div> </div> <div class="my-3"> <button class="d-block btn btn-link p-0 w-100 border-0 text-start" data-bs-toggle="collapse" data-bs-target="#meeting-communication" aria-expanded="true" aria-controls="meeting-communication" aria-label="Meeting Communication - Click to toggle" > <h3 class="h5"> Meeting Communication<i class="bi bi-chevron-down ps-2"></i> </h3> </button> <div class="collapse show" id="meeting-communication"> <span class="d-inline-block mb-2 pe-2 me-2 border-end"><a href="/meeting/issues/">Reporting issues during the meeting</a> </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end"><a href="https://www.ietf.org/how/lists/#meeting">Meeting Mailing Lists</a> </span> <span class="d-inline-block mb-2 "><a href="/contact/ombudsteam/">Reporting Potential Harassment</a> </span> </div> </div> </div> <div class="col-12 col-lg-6"> <div class="my-3"> <button class="d-block btn btn-link p-0 w-100 border-0 text-start" data-bs-toggle="collapse" data-bs-target="#venue-information" aria-expanded="true" aria-controls="venue-information" aria-label="Venue Information - Click to toggle" > <h3 class="h5"> Venue Information<i class="bi bi-chevron-down ps-2"></i> </h3> </button> <div class="collapse show" id="venue-information"> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Venue and Hotels </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end"><a href="/meeting/childcare/">Childcare</a> </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Floor plans </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Participant wiki (local information) </span> <span class="d-inline-block mb-2 "><a href="/meeting/technology/">Meeting network and technology</a> </span> </div> </div> <div class="my-3"> <button class="d-block btn btn-link p-0 w-100 border-0 text-start" data-bs-toggle="collapse" data-bs-target="#additional-events" aria-expanded="true" aria-controls="additional-events" aria-label="Additional Events - Click to toggle" > <h3 class="h5"> Additional Events<i class="bi bi-chevron-down ps-2"></i> </h3> </button> <div class="collapse show" id="additional-events"> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Code Sprint </span> <span class="d-inline-block mb-2 pe-2 me-2 border-end">Hackathon </span> <span class="d-inline-block mb-2 ">Public Side Meetings </span> </div> </div> </ul> </div> </div> </div> <div class="border-bottom border-primary p-3"> <h2 class="h4">Meeting venue information</h2> <dl class="row"> <div class="col-12 col-lg-6"> <dt class="h5 fw-bolder">Venue</dt> <dd><div class="block-address_line">Fairmont The Queen Elizabeth</div> <div class="block-address_line">Montreal, Canada</div></dd> </div> </dl> </div> <div class="bg-white py-3"> <h2 class="h4 ps-3">Sponsors</h2> <div class="ps-3 py-3"> <h3 class="h5 mb-3">Host</h3> <ul class="list-unstyled"> <li class="d-inline-block me-3"> <img src="" width="" height="" alt=""> </li> </ul> </div> </div> </div> <nav aria-label="In this section" class="bg-body border col-12 col-lg-4 col-xl-3 p-3 p-lg-5 mb-4"> <h2 class="h5 mb-3"><a class="text-dark" href="/meeting/">Meetings</a></h2> <div class="block-paragraph"> <ul class="list-unstyled"> <li class="mb-1"><a class="text-dark" href="/meeting/121/">IETF 121 Dublin</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/122/">IETF 122 Bangkok</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/123/">IETF 123 Madrid</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/upcoming/">Upcoming meetings</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/past/">Past meetings</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/interim/">Interim meetings</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/hackathons/">IETF Hackathons</a></li> <li class="mb-1"><a class="text-dark" href="/meeting/code-sprint/">Code Sprint</a></li> <li class="mb-1"> <a href="/meeting/124/" aria-current="page">IETF 124 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