IP Blocker
Prevents access to all domains hosted on compromised public IP addresses to stop threats at their source.
Why blocking by IP matters for modern online security?
The problem
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.
Global
Apply consistent IP blocking policies across every office, remote user and distributed location.
200M
domains analyzed every day, including newly registered domains.
14 ms
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 choose Flashstart protection
Thanks to our global Anycast network and the use of artificial intelligence, we guarantee you immediate, reliable, and constantly updated Internet protection that is tailored to your business model.
Advanced protection
Block 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
A global cloud infrastructure designed to ensure optimal performance wherever you are.
Content Review
Filter inappropriate content and manage access to specific categories of websites in accordance with your company policies.
Detailed reports
Intuitive dashboard with real-time statistics and customizable reports for monitoring network activity.
Available 24/7
Continuous, uninterrupted protection. Our system is always active to defend your infrastructure.
Designed for your organization
Organizations
If you’re looking for a versatile and effective security solution, the FlashStart filter is ideal for remote working environments, complex corporate networks or simple connections.
System Integrators
ISP & Telco
Governments
Distributors
Businesses
MSP
FAQs
What does the IP Blocker do?
What does the IP Blocker do?
It blocks access to all domains hosted on public IP addresses with a bad reputation, stopping threats that reside on compromised servers.
How does this feature work with the FlashStart DNS server?
How does this feature work with the FlashStart DNS server?
When enabled, it ensures users only access resources on reputable IP addresses via FlashStart’s DNS, blocking all others.
Can IP Blocker prevent threats reused across domains?
Can IP Blocker prevent threats reused across domains?
Yes—because the same IP can host many domains, IP Blocker stops browsing to all of them once that IP is identified as compromise
How does IP Blocker improve threat prevention?
How does IP Blocker improve threat prevention?
By blocking the host infrastructure itself, it prevents access to unknown or reused domains that might otherwise slip through domain-based defenses.
Why block by IP instead of just by domain?
Why block by IP instead of just by domain?
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.
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DNS intelligence
Intelligent traffic analysis that detects suspicious, malicious, or inappropriate destinations before users can reach them.
Artificial Intelligence
Artificial intelligence and machine learning continuously analyze, classify, and update web domains to support predictive threat detection and content categorization.
