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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  • The details registered about me/my company are incorrect or out of date.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

Domain names

  • Whois Is your perfect .nl still free or who is the registrant
  • Domain Name Portfolio Checker Provides a full breakdown of your .nl domain names
  • .nl domain name All about .nl: registration, changes and tips
  • .nl Control Maximum control over changes on your domain name
  • .nl suggestion tool Create your perfect .nl
  • Registry services Expertise to help you set up and run your own domain
Overviewpage Domain names

Who we are

  • Where we stand for For confidence online
  • Our milestones SIDN’s history
  • Our organisation Supervisory board, CEO and management
  • Work at SIDN Our corporate culture and vacancies
Overviewpage About SIDN

What we do

  • Our core business Stability and security of .nl, share expertise and give advice
  • Our annual reports Our results and accountability
  • Our impact How we set out our impact at 3 fields
  • Sponsoring Sponsored projects and organisations

SIDN Labs

  • About SIDN Labs Our research team
  • Publications Follow our developments
  • Stats About the use of the .nl-zone
  • Tools and Measurements Which are available for anyone
Homepage SIDN Labs

News

  • News and Blogs About domain names, cybersecurity and online identity
  • Publications Our (white)papers, presentations and webinars
  • Newsletters Stay informed with the latest news by e-mail
  • Press Press contact, Press list and the press photo gallery

Cybersecurity

  • SIDN BrandGuard Brand protection against phishing and reputational damage
  • Logo detection Detect online use and abuse of your logo
Overviewpage Cybersecurity

Vacancies

  • Technical Security Officer

    Become SIDN's technical security expert and help protect the infrastructure and systems at the electronic heart of the Netherlands!

  • Internships and dissertations

    SIDN offers opportunities for internships and dissertations.

  • Open applications welcome

    No suitable vacancy at SIDN? Use the open application opportunity or the vacancy alert.

More vacancies

News

  • BGPsec - Could you run it if you wanted to?

    Tuesday 15 April 2025

    SIDN Labs

    Evaluating the current state of BGPsec implementations through hands-on experiments

    Read more BGPsec - Could you run it if you wanted to?
  • Monitoring highly distributed DNS deployments: challenges and recommendations

    Tuesday 25 March 2025

    SIDN Labs

    The root server system as a use case examined

    Read more Monitoring highly distributed DNS deployments: challenges and recommendations
  • RESTful Provisioning Protocol: from vision to IETF working group

    Tuesday 11 March 2025

    SIDN Labs

    The future of domain name provisioning is being designed now. Get involved!

    Read more RESTful Provisioning Protocol: from vision to IETF working group
More news and blogs

News

  • SIDN Annual Report 2024: Global interconnection is the internet's strength

    Wednesday 14 May 2025

    About SIDN

    Our Annual Report for 2024 is now available

    Read more SIDN Annual Report 2024: Global interconnection is the internet's strength
  • Partnering with CIRA for the security and stability of .nl

    Monday 12 May 2025

    About SIDN

    Operating the .nl domain is and will remain our top priority

    Read more Partnering with CIRA for the security and stability of .nl
  • NIST publishes new Secure Domain Name System (DNS) Deployment Guide

    Thursday 8 May 2025

    Cybersecurity

    Advice on organising and securing your DNS infrastructure

    Read more NIST publishes new Secure Domain Name System (DNS) Deployment Guide
More news and blogs
  • Do you have a question about one or more products?

    Contact SIDN Support
  • Do you have any questions or suggestions?

    Contact SIDN Support
  • Do you have any questions or suggestions?

    Contact SIDN Support
  • Do you have any questions or suggestions?

    Contact SIDN Support

Related articles

  • SIDN Annual Report 2024: Global interconnection is the internet's strength

    Wednesday 14 May 2025

    About SIDN

    Our Annual Report for 2024 is now available

    Read more SIDN Annual Report 2024: Global interconnection is the internet's strength
  • Partnering with CIRA for the security and stability of .nl

    Monday 12 May 2025

    About SIDN

    Operating the .nl domain is and will remain our top priority

    Read more Partnering with CIRA for the security and stability of .nl
  • NIST publishes new Secure Domain Name System (DNS) Deployment Guide

    Thursday 8 May 2025

    Cybersecurity

    Advice on organising and securing your DNS infrastructure

    Read more NIST publishes new Secure Domain Name System (DNS) Deployment Guide

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Domain names

  • Whois
  • .nl suggestion tool
  • .nl domain name
  • .nl Control
  • Domain Name Portfolio Checker
  • Registry services
  • Registering a domain name
  • Updating your domain name

Cybersecurity

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  • Modern standards
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  • Our security approach

SIDN Labs

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  • Stats
  • Tools and Measurements
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About SIDN

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