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Frequently asked questions

  • I am looking for a domain name registrant. Where can I look it up?

    The Whois is an easy-to-use tool for checking the availability of a .nl domain name. If the domain name is already taken, you can see who has registered it.

    On the page looking up a domain name you will find more information about what a domain name is, how the Whois works and how the privacy of personal data is protected. Alternatively, you can go straight to look for a domain name via the Whois.

  • I would like to transfer my domain name to another registrar. What is the procedure?

    To get your domain name transferred, you need the token (unique ID number) for your domain name. Your existing registrar has the token and is obliged to give it to you within five days, if you ask for it. The procedure for changing your registrar is described on the page transferring your domain name.

  • The details registered about me/my company are incorrect or out of date. How can I get them updated?

    To update the contact details associated with your domain name, you need to contact your registrar. Read more about updating contact details.

  • Why is my domain name in quarantine?

    When a domain name is cancelled, we aren't told the reason, so we can't tell you. You'll need to ask your registrar. The advantage of quarantine is that, if a name's cancelled by mistake, you can always get it back.

    One common reason is that the contract between you and your registrar says you've got to renew the registration every year. If you haven't set up automatic renewal and you don't renew manually, the registration will expire.

  • Ik heb een klacht over mijn provider/registrar. Kan ik daarvoor bij SIDN terecht?

    Wanneer je een klacht hebt over of een geschil met je registrar dan zijn er verschillende mogelijkheden om tot een oplossing te komen. Hierover lees je meer op pagina klacht over registrar. SIDN heeft geen formele klachtenprocedure voor het behandelen van een klacht over jouw registrar.

  • What conditions do I have to meet as a registrar?

    Would you like to be able to register domain names for customers or for your own organisation by dealing directly with SIDN? If so, you can become a .nl registrar. Read more about the conditions and how to apply for registrar status on the page becoming a registrar.

More frequently asked questions

Successful transition to ISO 27001:2022

SIDN now follows a new version of the standard, which puts emphasis on cybersecurity

ISO27001 on display
  • Thursday 23 January 2025

Late in 2024, DEKRA carried out the annual audit for our certification under the information security standard ISO 27001. With this year's audit, there was even more at stake than usual, because we wanted to transition to the 2022 version of the standard. And it gives us great satisfaction to announce that the switch was completed successfully.

Revised risk picture

Profielfoto van Ferry Stelte, CISO bij SIDN
Ferry Stelte, CISO bij SIDN

"Information security is a high priority for us," says SIDN's Security Officer Ferry Stelte. "Developments in areas such as cloud technology, automation, artificial intelligence, cybersecurity, privacy, malware and ransomware oblige us to consider new situations. We've therefore had to reassess our current risk picture and start managing new threats on an active, structured basis. The new version of ISO/IEC 27001:2022 covers those new scenarios, so we were keen to migrate to the latest version."

The growing importance of information security

"Information security is something that concerns everyone at SIDN every single day. Its importance is growing all the time, and so is our investment in it. And we're clear about the reason for that," says SIDN's CEO Roelof Meijer. "We play a vital role on the Dutch part of the internet, and in a world where stories of hacks and information leaks make the news on a daily basis, it's very important that we have our information security in order. Some years ago, SIDN became the first registry anywhere to gain ISO 27001 certification, illustrating just how seriously we've always taken security. Transition to the new version of ISO 27001 emphasises how we continue to do everything possible to protect the information we hold and the systems we operate against unauthorised access and to ensure the continuous availability of .nl. What's more, we've completed the translation more than 6 months ahead of schedule. That's a great achievement by our people, in which I take great pride!"

Portrait Roelof Meijer, CEO SIDN
Roelof Meijer, SIDN's CEO

What is ISO 271001?

ISO 27001 is an international standard published by the International Standardisation Organisation (ISO), which sets out a framework for information security management within an organisation. It's designed to assure the confidentiality, integrity and availability of the organisation's information by defining a model security process for the realisation continuous improvement by means of a cycle of risk assessment and mitigation, monitoring and reporting.