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Questions tagged [iana]

IANA is the Internet Assigned Numbers Authority. Use this tag only in conjunction with another tag, such as timezone or dns.

The IANA functions coordinate the Internet’s globally unique identifiers, and are provided by Public Technical Identifiers, an affiliate of ICANN.

It provides:

  • Domain Names (DNS Root Zones, etc.)
  • Number Resources (IP Addresses, AS Numbers)
  • Protocol Assignments (registered port numbers)
  • Time Zone Database (for time zone names like America/New_York)
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What are the 153 top level domains starting with XN?

I was inspecting the full list of IANA top level domains and came across some uncommon ones, but also some very uncommon ones, particularly 153 top level domains starting with…
stevec
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IANA Timezones for mainland United States

IANA maintains many time zones in cities that represent the world. I don't want to maintain a list of all zones in a UI (because it's a third party system and would be unpractical to do so) and offer just the 4 main choices. Now which IANA value…
simbolo
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What is the correct MIME type for a font file?

I have not been able to find a canonical source that indicates the correct MIME type for any and/or each type of file format. All the sources that I have found appear to contradict each other and/or the IANA MIME type RFCs and their associated…
smartcaveman
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How to stop C++20 std::chrono zoned_time printing GMT-4 instead of EST?

Previously I used Howard Hinnant's "date.h" header library but I recently switched to C++20's std::chrono (which is basically an implementation of Howard's cool library) but I cannot get the timezone abbreviations to print in a normal way (e.g. EST…
David A
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Selecting a Multicast IP Address

I'm having trouble understanding how multicast addresses work. First off, is it true that if I have N clients or peers working on separate networks, they all subscribe to the same multicast group, and this group allows any source to send messages,…
Josh G
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Is there a reputable source that provides mappings of UN/LOCODEs to Olsen Timezones?

I've been researching CLDR and IANA in order to find a centralized mapping of UN/LOCODEs to Olsen Timezones. Ideally I would like to have for example: +--------------+--------------------+ |un_locode |timezone …
mattbrosenberg
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Is there a database with location -> name of timezone as per IANA Time Zone Database

In my script (PHP), I use the tz database label for each location in my database: http://en.wikipedia.org/wiki/Tz_database I am entering a whole series of places (countries, provinces, states, cities, etc.) from around the world, and for each, I…
augustin
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Is there an official or de-facto common URN NID for private unregulated use?

I would like to use URNs in a project of mine. And I am hardly willing to apply my humble project for official IANA registration but would like to keep from violating standards if possible. That's why I'd like to know if there is a standard (or…
Ivan
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tzupdater failures with 2020b & 2020c

Today iana released timezone db update for 2020b version. Java's tzupdater tool (2.3.1) from oracle fails to patch OpenJDK8u265. $ java -jar tzupdater.jar -v -u -f -l file:tzdata-latest.tar.gz Using file:tzdata-latest.tar.gz as source for tzdata…
jmj
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java.time.zone.ZoneRulesProvider for Microsoft time-zones

I am coding against an external API that returns what appear to be windows time-zone descriptions as strings e.g. "Romance Standard Time", and I need to parse these into java ZoneIds or offsets. A list of these values is available here. The…
Luciano
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Should I register my multiplayer game's port with the IANA?

I have a piece of multiplayer game software which is approaching maturity and will hopefully be in a public testing phase soon. For informal private tests, I've been using a port number that I'm fond of, which falls in the User Port range,…
user1134918
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Storing Time Zones on an SQL Server

I'm working on a world-wide scheduling service which uses physical locations in different time zones. These time zones must be persisted in the database along with each location. The question is, how are they best stored? We currently use a custom…
Mikkel R. Lund
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Need help using the official IANA timezone database in SQL

I am using T-SQL queries to retrieve data from an Azure SQL database for customer data visualization. I need a way to use an IANA timezone eg. Europe/Copenhagen to convert a UTC time eg. 10-08-2020 12:32:00 to local time eg. 10-08-2020 14:32:00 in…
Mike
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What is the MIME type of an EXIF JPEG file without a JFIF header?

I have been looking at the IANA MIME type registry for JPEG, and it seems that image/jpeg is only registered for the format following the JFIF standard. Therefore, from that, there is no MIME type for JPEG files with EXIF data and no JFIF header, am…
Carl Eric Codere
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Why some time zone information are missing on windows 10?

In my local computer i am trying to access the offset values of IANA timezone using the converter as follows, foreach (var timeZone in TZConvert.KnownIanaTimeZoneNames) { var tzi = TZConvert.GetTimeZoneInfo(timeZone.ToString()); TimeSpan offset…
Sajeetharan
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