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  • The details registered about me/my company are incorrect or out of date.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

Australia's Telstra switches mobile users to IPv6-only

High cost of IPv4 address blocks necessitated interim use of CGNAT

  • Wednesday 3 June 2020

Australian telecom service provider Telstra has switched its mobile users to IPv6-only. The move comes after mobile service providers in South Korea and Vietnam decided to migrate tens of millions of customers to IPv6-only, while counterparts in India and China now have hundreds of millions of users connected to IPv6-only services. Telstra has a total of 18.3 million mobile connections. However, not all of them are migrating to IPv6-only; BYOD tablets, modems, smart devices and the like are not included in the move.

Telstra has been switching users to IPv6-only since February 2020, when migration began in the state of South Australia. The whole process was complete by the end of the month, meaning that Telstra customers' mobiles and tablets are no longer assigned IPv4 addresses when they connect to the internet.

464XLAT, DNS64 and NAT64

Because many of the servers on the internet don't yet have IPv6 addresses, Telstra is using 464XLAT. For an explanation of how a DNS64 server and a NAT64 gateway configured in tandem enable IPv6-only clients to access IPv4-only servers, see this article. Although such a configuration is now recognised as the most future-proof route to an internet infrastructure running exclusively on IPv6, the use of 464XLAT technology does have drawbacks. Because the first translation step is performed by the DNS64 resolver, the procedure doesn't work with literal IPv4 addresses (e.g. 192.0.2.5). Also, if there is no true IPv6 address for a given server (i.e. no AAAA record is published on the authoritative server), there will of course be no DNSSEC signature (RRSIG record) either.

From dual-stack to IPv6-only

Telstra introduced its existing dual-stack service for mobile customers in summer 2016. Even back then, the ultimate goal was migration to IPv6-only [1, 2, 3]. However, that was eighteen months after Telstra had announced that it had no more IPv4 addresses and was therefore obliged to start implementing CGNAT, with all the attendant drawbacks.

Rising price of IPv4 address blocks

By 2018, Telstra had hundreds of thousands of mobile devices using IPv6, mainly dual-stack iPads. Despite claiming that as a success, later in the year Telstra decided to accelerate its transition to IPv6. The trigger for that decision was the need to spend hundreds of thousands to acquire new IPv4 address blocks. The cost of investing in new CGNAT hardware was calculated at 4.3 million euros, compared with 11.5 million to obtain the IPv4 addresses needed for a period of three years. Unsurprisingly, therefore, CGNAT has played a prominent role at Telstra in the intervening years.