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Forestool Forestool

Free web tools for network diagnostics, DNS analysis, security checks, SSL verification, and RAID calculations. Essential browser utilities for IT engineers.

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🌐 Network

⚙️ DNS & Mail

🛡️ Security

🛠️ Utility

📚 Detailed Tool Descriptions

💻 Environment Variables & Headers

Instantly display your public IP address, hostname, and all HTTP request headers sent by your browser. Essential for checking VPN/Proxy configurations and debugging server-side variables passed from clients. You can also verify browser-specific information like User-Agent and Accept-Language at a glance.

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📍 What is my IP & Geolocation Map

Instantly check your current public IP address and visualize your estimated geolocation (Country, City, ISP) on an interactive map. You can also search for the location of any other IP address to see where it originates from.

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🏠 Host Information (DNS/ISP)

Retrieve Forward/Reverse DNS, WHOIS records, ISP, and geolocation data for any domain or IP address. A powerful tool for server identification, network troubleshooting, and analyzing source of access. It provides a comprehensive overview by consolidating multiple information sources into a single view.

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📡 Ping & Latency Check

Measure network connectivity, RTT (latency), and packet loss to any target host. Use real-time ICMP ping results to verify connection stability and evaluate network performance across the globe. Get command-line style output conveniently in your browser.

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🚪 Port Open Checker

Check if specific ports (e.g., 22, 80, 443, 25565) on a target host are open and accessible from the outside. Ideal for verifying firewall settings or port forwarding for game servers like Minecraft. *Checking port 25 is restricted for anti-spam purposes.

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🛰️ Traceroute

Visualize the full network path and hop-by-hop latency to a target server. Identify network bottlenecks and points of failure to understand how packets traverse the internet to your destination. It provides standard traceroute results using ICMP to help diagnose routing issues.

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🔍 Website Diagnosis

Comprehensive analysis of DNS resolution, HTTPS settings, security headers, and response speed. Evaluate website health and security status to optimize performance and strengthen server-side protection. Ideal for engineers to perform health checks both before and after site deployment.

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🌍 DNS Record Lookup

Quickly check A, MX, TXT, CNAME, and NS records. Perfect for verifying DNS propagation, discovering configuration errors, and checking email-related records like SPF, DKIM, and DMARC. Additionally, it diagnoses DNSSEC validity and EDNS support status.

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⚒️ DNS Query (dig)

Execute professional-grade DNS queries using the dig command. Analyze raw response data for advanced troubleshooting, allowing you to query specific name servers or any record types. Uncover internal information not visible through standard lookups.

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✉️ Mail Header Analyzer

Trace email delivery paths and verify SPF/DKIM/DMARC status by analyzing email headers. Identify delivery issues, investigate spoofing attempts, and improve your mail server's reliability. It parses complex headers into a human-readable format for easy analysis.

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🛡️ RBL/Spam Blacklist Check

Perform checks across major RBL/DNSBL (Real-time Blackhole List) databases to see if an IP address is blacklisted. Use this to diagnose email delivery failures and monitor server reputation. Scanning multiple lists simultaneously allows for rapid response to blacklisting issues.

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📜 SSL Certificate & TLS Diagnosis

Verify SSL/TLS certificate validity, expiration, issuer, and protocol support. Prevent renewal oversights, detect configuration errors, and ensure secure connections using modern encryption standards. Supports SNI (Server Name Indication) for diagnosing environments with multiple certificates.

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🔒 Security Header Check

Detailed diagnosis of HTTP response headers including HSTS, CSP, X-Frame-Options, and more. Get a security score and actionable recommendations to harden your website against common web-based attacks. Verify settings designed to protect users from threats like Cross-Site Scripting (XSS).

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🔍 Certificate Transparency (CT) Search

Search public logs for all certificates issued for a specific domain using Certificate Transparency (CT). Monitor for unauthorized certificate issuance and discover subdomains to protect your online presence. Lists issuance history including dates and certificate authorities.

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🗄️ RAID Capacity Calculator (RAID 0, 1, 5, 6, 10, 50, 60)

Calculate usable capacity and fault tolerance with hot spares for RAID 0, 1, 5, 6, 10, 50, 60, and RAIDZ3. Compare storage configurations easily. Copy calculation results with a single click.

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🔑 Secure Password Generator

Generate high-entropy, strong passwords with custom length and character sets. Security is ensured by client-side processing, meaning your passwords are never sent to the server. Customize settings to include symbols or exclude ambiguous characters for robust account security.

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🧮 IPv4 Subnet Calculator (CIDR)

Quickly calculate network address, broadcast address, usable IP range, and subnet mask from an IP address and CIDR prefix. Perfect for network planning and cloud VPC design.

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🔍 MAC Address Vendor Lookup

Identify the manufacturer from a MAC address by analyzing the OUI (Organizationally Unique Identifier). Useful for identifying unknown devices on your network and managing hardware inventory. Provides vendor information based on the latest IEEE database.

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📝 Text Diff Checker

Compare two text blocks or source code snippets to find differences. Additions and deletions are highlighted clearly. All processing is done client-side, keeping your sensitive data fully secure.

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🔐 Hash Generator

Instantly generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text. Useful for verifying passwords or checksums. Runs entirely securely in your browser.

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📋 JSON Formatter & Validator

Beautify and format messy JSON data into a readable tree structure. It automatically detects and highlights syntax errors. All processing is done securely in your browser (client-side), ensuring your sensitive data is never sent to any server.

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🔄 URL / Base64 Encode & Decode

Easily encode and decode strings using URL encoding or Base64. A handy utility for parsing access logs or debugging APIs. All conversions are performed securely in your browser without sending any data to the server.

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💬 Feedback & Requests