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ICANN DNS Symposium | May 2017

ICANN DNS Symposium | Madrid | 13 May 2017 | Register Now!

The ICANN DNS Symposium is a one-day event focused on all aspects of the Domain Name System (DNS). Join members of the ICANN organization to explore ICANN's current initiatives and projects relating to DNS research, operations, threats and countermeasures and technology evolution.

Who Should Attend?

This event is geared to those who have a foundational understanding of the DNS and an interest in DNS operations, engineering, research and standards development or operational security. Remote participation will be available.

Meet and Greet Welcome Reception: Friday 12th May (18:30 – 20:30 pm), Florencia Room, Hotel NH Collection Madrid Eurobuilding

ITHI Workshop: Friday 12th May (10:00 am – 12:00 pm)
ICANN DNS Symposiums (IDS): Saturday 13th May (9:00 am – 5:00 pm)


Hotel NH Collection Madrid Eurobuilding
Calle de Padre Damián, 23, 28036 Madrid, Spain
+34 913 53 73 00

Hotel Distance to Venue (km) Single Room Rate Make a Reservation
Hotel NH Madrid Eurobuilding 0 171.60EUR (tax included) Click here
AC Hotel Aitana 0.6 165EUR (tax included) Click here
H10 Tribeca 1.1 130EUR + tax Send an email to, for the attention of Lucía Moreno. Quote code "ICANN bedrooms."
Holiday Inn Madrid - Bernabeu 1.4 110EUR + tax Send an email to or call +91 456 8010 / 8011 / 8013. Quote code "E88."

Sessions and Presentations 13 May 2017

29:03 Welcome: ICANN's DNS Work  
Keynote: ICANN and Technical Work: Really? Yes! Presentation [PDF, 102 KB]
29:40 That's Still a Lot of Packets: Garbage Traffic at the Root Presentation [PDF, 1.2 MB]
25:04 Root Server Operated by ICANN Presentation [PDF, 4.8 MB]
20:39 Root KSK Roll Update Presentation [PDF, 794 KB]
21:44 IPv6 Meets Large Responses from TLD Servers Presentation [PDF, 339 KB]
26:38 ICANN's SLA Monitoring System (SLAM) Presentation [PDF, 2.0 MB]
34:14 Detecting DNS Abuse Presentation [PDF, 2.1 MB]
29:01 CBOR Format for DNS Packet Capture Presentation [PDF, 978 KB]
16:13 DNSSEC Cryptographic Habits of the gTLD Second Level Zones Presentation [PDF, 307 KB]
Introduction to the OCTO Research Middlebox Lab Presentation [PDF, 237 KB]
25:29 Root KSK Protection and Key Ceremonies Presentation [PDF, 1.6 MB]
22:12 ITHI Project Progress Update Presentation [PDF, 3.7 MB]
22:15 PTI/IANA Update Presentation [PDF, 577 KB]
26:39 New Datasets Available for Colliding Domains Presentation [PDF, 308 KB]
2:31 Wrap-up: Questions and Suggestions from the Audience  

Remote Participation in English.

Contact us
Email with "ICANN DNS Symposium" in the subject line.

Sponsor the ICANN DNS Symposium

View sponsorship opportunities [PDF, 170 KB].

Please email with "DNS Symposium 2017" in the subject line to learn how to sponsor the event or get more information.

ITHI Workshop Registration Operations Workshop
GDD SummitDNS SymposiumOARC 26
Domain Name System
Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as"""" is not an IDN."