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https://en.wikipedia.org/wiki/Internationalized_domain_name
Internationalized domain names are stored in the Domain Name System (DNS) as ASCII strings using Punycode transcription. The DNS , which performs a lookup service to translate user-friendly names into network addresses for locating Internet resources, is restricted in practice [1] to the use of ASCII characters, a practical limitation that ...
https://www.ibm.com/support/knowledgecenter/SSD29G_2.0.0/com.ibm.swg.ba.cognos.tm1_turb.2.0.0.doc/c_unicodeanddns.html
Unicode and DNS When configuring the DSN to import Unicode data from an Oracle database using the version 11g client/ODBC driver, be sure to specify the Enable Closing Cursors option on the Application tab. TI processes can fail if this option is not specified.
https://docs.infoblox.com/display/NAG8/Support+for+Internationalized+Domain+Names
Jun 28, 2017 · The NIOS appliance supports IDNs in all domain name fields. For information, see IDN Support For DNS Zones. You can enter non-English characters in the domain name fields through Grid Manager and the Infoblox API. The NIOS appliance does not support IDNs for data that is configurable through the Infoblox CLI commands.
https://www.icann.org/resources/pages/dnssec-what-is-it-why-important-2019-03-05-en
Almost all common authoritative name server software supports signing zones, and many third-party DNS hosting providers also support DNSSEC. Usually, enabling DNSSEC for a zone with a hosting provider is quite easy: often it entails little more than clicking a check box.
https://www.oreilly.com/library/view/windows-server-2012/9780133116007/ch10lev2sec32.html
Although Microsoft DNS supports Unicode characters, it is a best practice that you make any DNS implementation compliant with the standard DNS character set so that you can support zone transfers to and from non-Unicode-compliant DNS implementations, such as UNIX BIND servers.
https://support.microsoft.com/en-gb/help/909264/naming-conventions-in-active-directory-for-computers-domains-sites-and
In the Windows 2000 domain name system (DNS) and in the Microsoft Windows Server 2003 DNS, the use of Unicode characters is supported. Other implementations of DNS do not support Unicode characters. Avoid Unicode characters if queries will be passed to the servers that use non-Microsoft implementations of DNS.
https://www.unix.com/unix-for-advanced-and-expert-users/28695-unicode-support-bind.html
In most of the searching I've done, the only DNS servers I see that do support Unicode are Windows DNS servers. I have no interest or desire to go that route unless there is absolutely no other way. Based on the entries in Microsoft's knowledgebase, it would appear that they've "extended" the functionality of their DNS servers beyond what is defined in the RFCs.
http://www.unicode.org/faq/idn.html
Q: Do IDNs change the Domain Name System (DNS)? A: No. Internally, the non-ASCII Unicode characters are transformed into a special sequence of ASCII characters. So as far as the DNS system is concerned, all domain names are just ASCII.
https://en.wikipedia.org/wiki/Punycode
Punycode is a representation of Unicode with the limited ASCII character subset used for Internet hostnames.Using Punycode, host names containing Unicode characters are transcoded to a subset of ASCII consisting of letters, digits, and hyphen, which is called the Letter-Digit-Hyphen (LDH) subset.
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