Registration Reminder for IETF 123, Childcare Registration Closed, & Hotel Availability Limited

[IETF Secretariat <[e-mail]>]

IETF 123 Madrid
19-25 July, 2025
Hosted by Ericsson

The Early deadline for registration is Monday, 7 July 2025. Be sure to register before the deadline passes as fees will increase. Register online at: https://registration.ietf.org/123

Early Registration Rates

Onsite
   Week Pass: $1155 ($1397.55 with VAT)
   One-day Pass: $620 ($750.20 with VAT)
   Full-time Student Week Pass: $160 ($193.60 with VAT)

Remote
   Week Pass: $327
   One-day Pass: $180
   Full-time Student Week Pass: $58

EARLY rates will apply until 7 July 2025, and STANDARD rates will apply after 7 July 2025. Full details of all rates are on the registration site linked above.

# Childcare Signups Closed
We’re thrilled to share that IETF 123 has received a record number of childcare sign-ups! Due to limited space and caregiver availability, we have now closed registration for this service. Thank you for your understanding, and we look forward to welcoming you and your families to the meeting.

# Hotel Availability

The Melia Castilla, our headquarter hotel and meeting venue, has reached capacity for guest room reservations during the IETF 123 dates. We are actively working with the hotel to secure additional rooms within our block. In the meantime, if you encounter any difficulties with booking accommodations, please contact us at [e-mail] for further assistance.