Technical and privacy enquiries

What is WHOIS?

WHOIS is a protocol that allows users to access EURid's domain name database. Using WHOIS you can query a .eu domain name and its script variants to check its availability. If a domain name is registered, WHOIS shows the contact details of the domain name holder and other additional information about the registration. Read more about it here.

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The WHOIS database is displaying a domain name with inaccurate registration data. How do I notify EURid?

If you believe the registrant data for a specific domain name is inaccurate, you may bring it to our attention. To do so, please go to and type in the relevant domain name. Once on the results page please click on the hyperlink "Inaccurate registrant data". Subsequently, please fill out the electronic form and send it to us.



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What are proxy services and why are they used?

Proxy services are services offered to conceal the contact details of the domain name holder for various reasons. One of the reasons for using proxy services is to ensure privacy: some holders do not want their private data to be shown on the public WHOIS of the domain name registry. At EURid, we automatically hide the registration data of individuals for privacy reasons.

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What is an ACE string?

An ACE string is what you get once the IDN you entered in your browser’s address bar has been converted into a form that is understood by the Domain Name System.


Read more about IDNs here.

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What is homoglyph bundling? Does EURid offer it?

Depending on the script and the font used, domain names might look similar. As a matter of fact, certain characters or glyphs have shapes that might look either identical or might be hard to differentiate at first glance. Domain names are considered homoglyphs of each other if all characters of one domain name are homoglyphs of all characters of the other domain names, at their respective positions.


A Homoglyph Bundle is a set of domain names that are all homoglyphs of each other.


Certain registries have adopted policies to deal with homoglyph bundles. The EURid approach is to ensure that once a domain name from a certain homoglyph bundle is registered, it is not possible to register any other domain name belonging to the same bundle.


This approach aims to reduce the risk of confusion created by domain names that may look similar.

Since the launch of the .eu TLD in the Cyrillic script on the 1st of June 2016, the homoglyph bundling algorithm takes legacy domain names (such as юю.eu) into account. As long as legacy Cyrillic domain names (domain names consisting of Cyrillic characters but with the Latin extension) exist, homoglyph bundling will not take the extension into account to determine if a domain name is in the same homoglyph bundle as another domain name.


It is worth to point out that EURid hasn’t allowed script mixing since the launch of IDNs to reduce the risk of having confusingly similar domain names.


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How do I change my contact details in the WHOIS database?

Please contact your registrar who is able to change your contact details on your behalf.


It is very important that your contact details are correct. If your contact details are false, contain mistakes or are outdated we won't be able to contact you and you might end up losing your domain name.


The amount of contact information shown in the WHOIS depends on whether the domain name was registered by a company or organisation or by a private person.

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Has there been a Sunrise period for .eu IDNs?

The decision to launch IDNs without a Sunrise period was made based on the results of extensive preparation. This included papers drafted by the EURid IDNs Advisory Board and two surveys that EURid ran in 2008:

A survey among CENTR members

The results of the survey showed no particular trend in favour of sunrise or landrush when introducing IDNs. The registries who opted for one solution over another were motivated by internal considerations, some of which were linked to the local Internet communities and/or their organisational profile.

A public, online survey

Results showed that the public did not have a clear, strong wish for .eu to have a Sunrise period when IDNs are introduced.

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What are the syntax requirements for IDNs?

Please see our rules for domain names to check the syntax requirements for IDNs.

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