National NL-Alert test, December 2026

At around 12:00 on Monday 7 December 2026, mobile phones across the Netherlands will sound a loud alarm at more or less the same moment. This is the national NL-Alert test, the twice-yearly check of the Dutch government’s public warning system. The message that appears will say plainly that it is a test, and it asks nothing of you.

If you have recently arrived in the country, the first one is genuinely startling. Your phone emits a penetrating alarm sound. That is the point. A warning built to be politely ignored would be worthless in an actual emergency.

The test is national rather than regional, so there is no venue, no ticket and nowhere to go. It reaches you wherever you happen to be standing in the Netherlands at around midday.

What happens on the day

At around noon the government broadcasts a message to phones throughout the country. The text states explicitly that this is a test of NL-Alert and that no action is needed. It arrives with a penetrating alarm sound.

Alongside the phone alert, NL-Alert messages also appear on digital screens at public transport stations and on advertising displays. So even people whose handset does not sound, for whatever reason, will often see the test somewhere in public.

Then it is over. Dismissing the notification is the whole of your involvement.

Why the government runs a test at all

The stated purpose is straightforward: the test lets you check that your own phone actually receives NL-Alerts. That sounds trivial until you consider how quietly the chain can break. On an older handset the relevant broadcast channel may never have been switched on. A phone that is not connected to a Dutch mobile network will not be reached at all. Neither of those announces itself. The test is the one moment in the calendar when a silent phone tells you something is wrong.

The schedule is fixed and predictable. The government sends a test message twice a year, in June and December, at around 12:00. The next one is set for Monday 7 December 2026.

Checking whether your phone is set up

The practical value of the test is entirely in what you do if nothing happens. If your phone stays silent while everyone around you is dismissing an alarm, that is worth investigating rather than shrugging off.

A few things determine whether the alert reaches you. NL-Alert works through the Dutch mobile networks, meaning KPN, Odido and VodafoneZiggo. A handset that is switched off or in flight mode will not receive anything. If your phone is set to silent, the alarm will not sound.

NL-Alert is set up by default on mobile phones. Older devices sometimes need the relevant broadcast channel, numbered 919, to be enabled by hand, under Cell Broadcast in the device menu. It is also possible to switch NL-Alert off deliberately in your phone settings, with the obvious consequence that government emergency warnings will no longer reach you.

How the technology works

NL-Alert uses cell broadcast rather than text messages. The distinction matters more than it sounds. A broadcast goes out to every compatible phone in a defined area at once, instead of being addressed to individual numbers one by one. Because of that, it continues to work even when the mobile network is congested or overloaded, which is precisely the situation you get during a large incident when everyone reaches for their phone simultaneously.

It also means the system is anonymous. There is no sign-up, and your phone number remains unknown to the government. The service is free.

What NL-Alert is used for the rest of the year

Outside the test dates, NL-Alert is the government’s alarm for situations that threaten life and health. Large fires, serious incidents, severe weather and similar emergencies all qualify. During an incident the authorities decide which geographical area the alert is broadcast to, so a message may reach one city or one district rather than the whole country.

Every real NL-Alert message follows the same shape. It says what is happening, what you should do about it, and where to find further information and updates. The official advice on receiving one is direct: read it immediately, act on it, and help other people to do the same.

Real alerts arrive without warning and without a friendly preamble, which is why the December test is useful preparation. Once you have heard the tone in a harmless context, you recognise it instantly when it matters.

Common questions

Do I need to do anything when the test message arrives?

No. The test message states that it is a test and that no action is required. Dismissing the notification is all that is needed.

Do I have to register for NL-Alert?

No. NL-Alert is free and anonymous. There is no sign-up process, and your phone number remains unknown to the government.

How often does the test happen?

Twice a year, in June and December, at around 12:00.

Which networks carry NL-Alert?

NL-Alert is broadcast over the Dutch mobile networks: KPN, Odido and VodafoneZiggo.

What if my phone is on silent?

The alarm does not sound when your phone is set to silent.

Can I turn NL-Alert off?

Yes, through your phone settings. Doing so means you will no longer receive government emergency warnings.

Is there information in English?

The official NL-Alert website has an English-language section covering how the system works and the date of the next test.