Open Web Tools for Every Engineer
25 free tools for networking, DNS, security, and server configuration — open to everyone, from students to sysadmins.
- No login or installation
- Open source & transparent
- Sensitive data processed in your browser
Network & Connectivity
Monitor connection quality straight from Sequel's network.
Looking Glass
Ping and MTR from Sequel servers to check route quality to your destination.
Open ToolTraceroute
See every hop clearly — with latency, ASN, and router location.
Open ToolWhat's My IP
See your public IP, provider, ASN, and approximate connection location.
Open ToolIP Geolocation
Find the country, city, and coordinates of any IP address or domain.
Open ToolSubnet Calculator
Calculate network, broadcast, and host ranges for IPv4 and IPv6 without manual math.
Open ToolDNS, Email & Website
Diagnose DNS, email reputation, domains, and SSL in seconds.
DNS Lookup
Query A, AAAA, MX, TXT, NS, CAA, and more — from public resolvers or straight to the nameserver.
Open ToolDNS Trace
Trace resolution from the root and TLD down to the authoritative nameserver to find where it breaks.
Open ToolWHOIS Lookup
Check registrar, status, nameservers, and expiry date before a domain renewal is missed.
Open ToolBlacklist Check
Make sure your mail server's IP and domain aren't on spam blacklists — checked live against 15 blacklists.
Open ToolEmail Header Analyzer
Trace an email's delivery path and check SPF, DKIM, and DMARC to spot spoofed mail.
Open ToolSSL Checker
Validate a certificate, its remaining validity, and the CA chain in seconds.
Open ToolHTTP Headers
Inspect response headers, redirect chains, and a website's security header score.
Open ToolSecurity & SSL Certificates
Detect threats and generate safe credentials and certificates for your infrastructure.
Website Scanner
Check a URL against 5 open threat intelligence engines, with content analysis and a security audit.
Open ToolCSR Generator
Create a CSR and private key for a paid SSL order, right in your browser.
Open ToolCertbot Generator
Complete commands to install free Let's Encrypt SSL, including wildcard and auto-renew.
Open ToolPassword Generator
Strong random passwords from a cryptographic generator, created on your device.
Open ToolHTPasswd Generator
Create basic auth credentials with bcrypt or APR1 for Nginx and Apache.
Open ToolphpMyAdmin Blowfish
A valid blowfish_secret value for phpMyAdmin 5.2+ and older versions.
Open ToolServer Configuration & Developer
Ready-to-use configuration without memorizing syntax.
Nginx Generator
Clean server blocks for PHP, Laravel, WordPress, or a reverse proxy — with SSL included.
Open ToolApache Generator
Ready-to-use VirtualHosts for PHP-FPM, Laravel, WordPress, or a reverse proxy.
Open ToolCrontab Generator
Build cron schedules without memorizing the syntax, with a preview of upcoming runs.
Open ToolJSON Formatter
Beautify, minify, and validate JSON with clear error locations.
Open ToolJavaScript Formatter
Turn minified JavaScript, CSS, and HTML into clean, readable code.
Open ToolText Diff
Find differences between two texts or config files line by line.
Open ToolMarkdown Viewer
Open and preview READMEs or Markdown docs, with a table of contents and PDF export.
Open ToolOpen Source for Everyone
The Sequel team's contributions to the community — free to use, modify, and build on together.
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