Dutch Internet Providers Successfully Block Two Million Malicious Website Visits in National Cybersecurity Pilot
Amsterdam, Tuesday, 31 March 2026.
A groundbreaking collaboration between Dutch telecommunications companies and the National Cyber Security Centre prevented over two million attempts to access fraudulent websites, protecting more than 200,000 users since July 2025. The Anti Phishing Shield initiative updates a blacklist of 160,000 malicious domains every fifteen minutes, automatically blocking threats at the network level. This success comes as 17% of Dutch citizens fell victim to online crime in 2025, with phishing accounting for 91% of cyberattacks according to Deloitte research. The pilot’s effectiveness demonstrates how proactive network-level protection can significantly reduce cybercrime exposure, potentially setting a new standard for European digital defense strategies.
KPN Leads Network-Level Defense Strategy
Koninklijke KPN, the Netherlands’ largest telecommunications provider with approximately 38% of the Dutch fixed broadband market and roughly 31% of the mobile market as of Q3 2025 [3], emerged as the primary industry partner in implementing the Anti Phishing Shield technology [1]. The company’s Chief Information Security Officer, Jeffrey Leusink, emphasized that security represents a core operational standard rather than an optional service enhancement [1][4]. KPN’s participation demonstrates how major telecommunications infrastructure can be leveraged for national cybersecurity defense, with the company investing heavily in digital resilience alongside its ongoing fiber rollout program that reached over 5.7 million households in 2025 [3].
Technical Architecture Behind the Shield
The Anti Phishing Shield operates through a sophisticated DNS-based blocking system managed by the National Cyber Security Centre (NCSC) [1][4]. The NCSC continuously gathers intelligence on malicious domains from both public and commercial sources, analyzing these threats before adding them to a centralized ‘denial list’ that contains over 160,000 malicious domains [1][4]. This blacklist updates every fifteen minutes and gets distributed to participating internet service providers via DNS services, enabling real-time protection across multiple networks [1][4]. Customers of participating providers must opt-in to receive this protection service, which then automatically blocks access attempts to flagged domains without requiring any additional software installation or configuration [4].
Measurable Impact on Cybercrime Prevention
Since the pilot program’s launch in July 2025, the Anti Phishing Shield has demonstrated significant protective capabilities by blocking over two million attempts to visit phishing and fraudulent websites among a user base exceeding 200,000 participants [1][4]. This intervention becomes particularly critical when considering that 17% of the Dutch population, approximately 2.5 million people, became victims of online crime in 2025 [1][4]. The timing proves essential given that Deloitte research indicates 91% of cyberattacks begin with phishing attempts [1][4], making network-level blocking a strategic first line of defense against the most common attack vector.
Future Expansion and Industry Implications
The Ministry of Justice and Security, working alongside the NCSC, plans to expand both the reach and effectiveness of the Anti Phishing Shield beyond its current pilot status [4]. Eefje Zents, Director of Digital Resilience Cooperation at the NCSC, described the initiative as ‘a necessary step in the fight against online crime’ that demonstrates how collaborative approaches can protect consumers against phishing dangers [1][4]. The program’s management will transition to the NCSC, with plans to attract additional internet service providers and expand coverage to more customers within existing participating networks [4]. This expansion strategy could position the Netherlands as a model for other European nations seeking to implement similar national-level cybersecurity defenses through public-private partnerships.