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IP Blocker

Prevents access to all domains hosted on compromised public IP addresses to stop threats at their source.

The Problem

Why blocking by IP matters for modern online security?

Malicious actors frequently host harmful content on servers that get reused across multiple domains. Blocking threats based solely on domain names can leave gaps: when a risky site is taken down, attackers may simply launch another domain on the same compromised server. IP Blocker addresses this problem by preventing access to all domains on a known bad IP, reducing the risk of unseen or repeated attacks. With FlashStart’s DNS servers, users can rely on browsing only through IP addresses with strong reputations, avoiding connection attempts toward compromised hosts.

20M

users protected worldwide, relying every day.

20B

DNS queries
processed daily

200M

domains analyzed every day, including newly registered domains.

14ms

an average DNS response time, ensuring IP-level blocking.

Protection and prevention

FlashStart IP Blocker prevents access to dangerous resources directly at the network level by blocking traffic to compromised public IP addresses. Rather than blocking domains one by one, IP Blocker lets administrators enforce protection based on the IP itself, ensuring that all associated domains—even those not yet identified as malicious—are blocked. This leads to stronger defenses against reuse of compromised infrastructure and unknown malicious domains, providing greater security and peace of mind. Blocking by IP allows you to tackle threats more effectively by targeting the host infrastructure itself, instead of relying only on domain-based lists. IP Blocker integrates seamlessly with FlashStart’s DNS resolution, delivering protection without manual configuration of every individual domain, and offering an extra layer of prevention on top of traditional DNS filtering.

Why should you choose FlashStart protection?

Thanks to the global Anycast network and the use of artificial intelligence, we guarantee you immediate, reliable, and constantly updated internet protection tailored to your business model.
Extended protection

Blocks malware, ransomware, phishing, and other cyber threats in real time before they reach your network.

Guaranteed speed

Ultra-fast DNS filtering with minimal latency. Security never slows down your business operations.

Global coverage

Globally distributed cloud infrastructure for optimal performance, no matter where you are.

Parental control

Filter inappropriate content and manage access to specific categories of websites according to your company policies.

Detailed reports

Intuitive dashboard with real-time statistics and customizable reports for monitoring network activity.

Active 24/7

Continuous protection without interruptions. Our system is always active to protect your infrastructure.

Organizations

Designed for your organization

If you are looking for a versatile and effective security solution, the FlashStart filter is perfect for remote work environments, complex corporate networks, or simple connections.
MSP
ISP and WISP
Retailers
OEM & Manufacturers
Businesses
Schools

Frequently asked questions

It blocks access to all domains hosted on public IP addresses with a bad reputation, stopping threats that reside on compromised servers.
Attackers often reuse servers and IPs for multiple malicious sites. Blocking the IP stops all associated domains at once, even if they are new or unknown.
By blocking the host infrastructure itself, it prevents access to unknown or reused domains that might otherwise slip through domain-based defenses.
Yes—because the same IP can host many domains, IP Blocker stops browsing to all of them once that IP is identified as compromised.
When enabled, it ensures users only access resources on reputable IP addresses via FlashStart’s DNS, blocking all others.