This mechanism was introduced in order to effectively defend against malicious activity.

The mechanism requires that, before the desired action, enter the exact result of the operation are shown.

19 * 82257 =
Serbian National Internet Domain Registry
20:52 (CET) - 29. August 2015.

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IDN Encoder

ICANN (the Internet Corporation for Assigned Names and Numbers) began the process of introducing internationalised country code top-level domains (IDN ccTLDs) in November 2009.

Internationalised Domain Names (IDNs) is the term used for Internet domain names written using local languages and scripts. All characters which are not one of the 26 letters of the English alphabet, the numbers 0-9 or a hyphen (minus sign) are treated as IDN characters. So, every domain name which contains at least one IDN character is called an internationalised domain name.

The Swedish å, the German ü, the Romanian ş, the letters of the Russian or Greek alphabet, and of course Serbian Cyrillic letters, are all examples of IDN characters. All the characters which can be used in IDNs are defined by Unicode tables for different scripts. IDNs may contain all of these special characters (for example: bü, å, рнидс.срб).

On the 8th November 2010, ICANN approved the use of the “срб” string of characters as Serbia’s IDN ccTLD.


RNIDS offers the possibility of seeing how the conversion of a Unicode IDN into an ACE (ASCII Compatible Encoding) string looks. The ACE form of internationalised domain names allows the Domain Name System (DNS) to understand Unicode domain names and link them with the corresponding address on the Internet.

The ACE string of characters begins with the four-character string xn-- which marks the domain as an IDN. The remaining characters of the ACE domain name, using a combination of ASCII characters, represent the Unicode characters which form the internationalised domain name. One Unicode character is commonly represented by a combination of two ASCII characters.

For example, the domain name тест.срб (test.srb) in ACE form is xn--e1aybc.xn--90a3ac.

The tools you use to browse the Internet must be capable of using IDN domain names. The ACE string of characters is obtained when the IDN, which you typed in your Internet browser's address field, is converted into the form understood by the Domain Name System.

Unicode domain name:
ACE domain name:





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