Free Network Security Tools
30 free tools for network engineers and security teams. Firewall generators, DDoS calculators, vulnerability checkers, compliance tools, and packet capture builders. No signup required.
Firewall & Config Generators 6
iptables DDoS Protection Rule Generator
Generate iptables rules for DDoS mitigation. SYN flood protection, UDP flood filtering, ICMP rate limiting, and more.
Use Toolnftables DDoS Protection Rule Generator
Generate nftables rulesets for Linux DDoS mitigation. Modern replacement for iptables with better performance.
Use ToolFail2Ban Config Generator
Generate Fail2Ban jail.local configuration for SSH, Apache, Nginx, Postfix, and custom services.
Use ToolHAProxy DDoS Protection Config Generator
Generate HAProxy configuration for DDoS protection. Rate limiting, connection limits, slowloris protection, and more.
Use ToolBGP FlowSpec Rule Builder
Generate BGP FlowSpec rules for DDoS mitigation. Build traffic filtering rules compatible with ExaBGP, BIRD, GoBGP, and Cisco IOS-XR.
Use ToolDDoS Incident Response Plan Generator
Generate a comprehensive DDoS incident response plan tailored to your organization with roles, severity levels, and runbook steps.
Use ToolPacket Capture & Analysis 4
TCPDump Command Builder
Visual builder for tcpdump commands. Select interfaces, protocols, filters, and get a ready-to-use command.
Use ToolWireshark Display Filter Cheatsheet
Searchable reference of 80+ Wireshark display filters organized by category. Copy-ready filters for TCP, UDP, DNS, HTTP, TLS, and more.
Use ToolTCPDump & Wireshark Cheatsheet Generator
Generate customized tcpdump commands and Wireshark display filters for DDoS detection, traffic analysis, and network forensics.
Use ToolPCAP Upload Analyzer
Upload a PCAP or PCAPNG file for instant DDoS analysis. Client-side packet parsing with no uploads to any server.
Use ToolCalculators 11
DDoS Risk Score Calculator
Assess your organization's DDoS risk. Answer 8 questions to get a risk score with specific recommendations.
Use ToolPackets Per Second (PPS) Calculator
Convert bandwidth to packets per second and back. Understand DDoS attack sizes and calculate network capacity.
Use ToolServer Bandwidth Cost Calculator
Compare bandwidth costs across AWS, GCP, Azure, Hetzner, OVH, and more. Calculate monthly egress costs.
Use ToolSLA Uptime Calculator
Calculate allowed downtime for any SLA percentage. See how DDoS attacks impact your SLA compliance.
Use ToolMTU / MSS Calculator
Calculate effective MSS from MTU with various encapsulations (VLAN, PPPoE, GRE, IPsec, VXLAN).
Use ToolDDoS Downtime Cost Calculator
Calculate the true cost of DDoS downtime. Estimate lost revenue, labor costs, and annual impact.
Use ToolCost of Downtime Avoided Calculator
Calculate how much DDoS protection saves your business. Input your numbers, get ROI, payback period, and annual savings.
Use ToolIncident Response Time Calculator (MTTR)
Calculate your mean time to respond (MTTR) to DDoS attacks. Compare manual vs automated detection.
Use ToolFastNetMon Advanced vs Flowtriq Calculator
Compare the true total cost of FastNetMon Advanced vs Flowtriq. Includes required server costs, activation fees, and the features FastNetMon cannot match.
Use ToolDDoS Config Converter
Translate your current DDoS setup to Flowtriq. Select your platform — FastNetMon, Wanguard, Corero, Arbor, CosmicGuard, AWS Shield, and more — and get a personalized config, feature mapping, and price comparison.
Use ToolManaged DDoS Protection ROI Calculator
Compare the cost of hiring SOC analysts vs Flowtriq managed tiers. See savings, response time improvements, and which tier fits your infrastructure.
Use ToolAttack Simulation & Intelligence 5
DDoS Attack Simulator Report
Simulate a multi-stage DDoS attack against your infrastructure and see detection, classification, and mitigation in real time.
Use ToolLive DDoS Attack Map
Visualize DDoS attacks in real-time on an interactive world map. See attack types, volumes, sources, and targets.
Use ToolFlowtriq Detection Terminal
Watch Flowtriq detect, classify, and mitigate a DDoS attack in real-time with an interactive terminal simulation.
Use ToolDDoS Attack Vector Encyclopedia
The definitive guide to every DDoS attack vector: how they work, real-world impact, detection indicators, and mitigation strategies.
Use ToolIP Threat & Reputation Lookup
Look up any IP address for threat intelligence, abuse reports, geolocation, and reputation scoring across multiple threat feeds.
Use ToolVulnerability Checkers 6
DNS Propagation & Health Checker
Check DNS propagation across Google and Cloudflare DNS. Look up A, AAAA, MX, NS, TXT records with TTL values.
Use ToolOpen DNS Resolver Checker
Check if your DNS server is an open resolver vulnerable to DNS amplification DDoS attacks.
Use ToolMemcached Amplification Checker
Check if your Memcached server is exposed to UDP amplification attacks with up to 51,000x amplification.
Use ToolNTP Amplification Vulnerability Scanner
Check if your NTP server is vulnerable to monlist amplification attacks with 556x amplification.
Use ToolIs My Server Under Attack?
Check if your server is under DDoS attack right now. Enter your IP or hostname for a quick analysis.
Use ToolcPanel CVE-2026-41940 Vulnerability Checker
Check if your cPanel/WHM server is vulnerable to CVE-2026-41940, a CVSS 9.8 auth bypass via CRLF injection. Passive, non-invasive version check.
Use ToolCompliance 2
NIS2 Incident Report Generator
Generate NIS2 Article 23 incident notifications. Pre-fill your 24-hour early warning and 72-hour notification from real incident data.
Use ToolDDoS Incident Response Plan Template
Download a professional 10-section DDoS incident response plan. Fill-in-the-blank format satisfies NIST, ISO 27001, SOC 2, CCCS, and cyber insurance requirements.
Use Tool