IP & Domain Blocklist
Real-time cybersecurity blocklist with 500M+ malicious IPs and domains from 600+ trusted sources
Comprehensive IP & Domain Blocklist for Cybersecurity
IsMalicious provides the most comprehensive IP blocklist and domain blocklist for modern cybersecurity infrastructure. Our real-time blocklist API protects millions of users from malicious IPs, phishing domains, malware, adware, and tracking threats.
IP Blocklist - 100M+ Malicious IP Addresses
Our malicious IP blocklist contains over 100M verified threatening IP addresses, updated every hour. Protect your network perimeter from cyber attacks with comprehensive IP-based threat intelligence.
Malware Distribution
Block servers hosting ransomware, trojans, and viruses
Phishing Servers
Prevent credential harvesting attacks
Botnet C2
Identify command & control infrastructure
Brute Force
Stop automated attack attempts
DDoS Sources
Mitigate distributed attacks
Spam & Abuse
Filter unwanted network traffic
🌐 Domain Blocklist - 400M+ Malicious Domains by Category
Phishing Blocklist
45M+Block credential harvesting sites and fake login pages. Updated daily with newly registered phishing domains and brand impersonation attempts.
Malware Blocklist
89M+Prevent malware downloads by blocking known distribution domains. Includes ransomware, trojans, viruses, and malicious software hosts.
Adware Blocklist
28M+Block invasive advertising networks and unwanted software promotions. Improve user experience and reduce security risks from adware.
Tracking Blocklist
67M+Protect user privacy by blocking tracking domains, analytics scripts, fingerprinting services, and surveillance networks. GDPR compliant.
💡 Quick API Integration
Integrate our blocklist API in minutes with simple RESTful endpoints. Sub-100ms response times for real-time protection.
// Check if IP is in blocklist
const response = await fetch(
'https://api.ismalicious.com/check?ip=1.2.3.4'
);
const data = await response.json();
if (data.isMalicious) {
// Block the IP
console.log('Blocked:', data.sources);
}
// Check domain
const domainCheck = await fetch(
'https://api.ismalicious.com/check?domain=example.com'
);⚡ Real-Time Blocklist Updates
Unlike static blocklists that update weekly or monthly, our real-time blocklist provides continuous protection with the latest threat intelligence:
Hourly Updates
New threats added within minutes of discovery
600+ Sources
Combined intelligence from commercial and open-source feeds
Multi-Source Validation
Reduce false positives with cross-verification
WebHook Notifications
Get alerted when watched entities change status
🔧 How to Use Our Blocklist API
Firewall Integration
Download our IP blocklist and import into your firewall rules. Supports iptables, pfSense, Cisco ASA, FortiGate, and more. Automatic updates available.
DNS Filtering
Use our domain blocklist with Pi-hole, AdGuard Home, or DNS servers to block malicious domains at the DNS level. Perfect for network-wide protection.
Application Integration
Call our blocklist API from your application code to validate user inputs, URLs, and network connections in real-time. Available in all major languages.
SIEM Enrichment
Enrich security events with our threat intelligence to prioritize alerts and accelerate incident response. Compatible with Splunk, ELK, QRadar.
📊 Blocklist Coverage by Category
🆓 Free Blocklist Access
Start protecting your infrastructure today with our free tier - no credit card required:
Start Using Our Blocklist API Today
Join thousands of security professionals protecting their infrastructure