If a .nl domain name’s registration is ended – in other words, if the domain name is cancelled – the name is placed in quarantine for 40 days. While in quarantine, the domain name is technically non-functional, so it can’t be used for a website or e-mail, for example.
During the quarantine period, only the registrant to whom the domain name was registered at the time of cancellation can redeem it (i.e. get it released from quarantine). If this former registrant redeems the name, it becomes active again.
To redeem a domain name, the former registrant needs to contact a .nl registrar. This doesn’t necessarily have to be the registrar who looked after the domain name’s registration before it was cancelled. A full list of .nl registrars is available here. The chosen registrar acts as the former registrant’s representative in dealings with SIDN. Once the redemption request has been processed, the domain name will be re-registered to its former registrant. The contact details for the domain name's technical contact and administrative contact remain unchanged. So too does any DNSSEC protection that the name may have had, provided that the registrar undoing the deletion supports DNSSEC.
The quarantine system exists to protect the registrant and the registrar. It ensures that, if a .nl domain name is cancelled by mistake, there are no disproportionate consequences.
When a quarantined domain name is redeemed, SIDN charges a re-registration fee to the registrar that arranges the redemption. While a name is in quarantine, the Whois continues to show the details of the former registrant, but without the contact persons’ details. The name’s status is shown as ‘in quarantaine’.
If a domain name is not redeemed by its former registrant within the quarantine period, it becomes generally available for registration once the 40 days are up.