Router Setting

Tools

Every tool runs free, without an account. The library below is deduplicated so each tool appears once, with a filter to find it quickly.

DNS Tools

DNS Lookup

Look up A, AAAA, MX, TXT, NS, CNAME, and SOA records for any domain.
Email & Domain Authentication

Email Authentication Checker

Check a domain's SPF, DKIM, and DMARC records.
SSL & Security

HTTP Security Headers Checker

Check whether a site sends HSTS, CSP, and other browser security headers.
Website Speed & Performance

Internet Speed Checker

Measure download speed, upload speed, ping, jitter and connection quality in a richer same-site browser test.
Network Calculators

IP Address Converter

Convert an IPv4 address between dotted-decimal, binary, hex, and integer form.
IP Address Tools

IP Geolocation Lookup

Look up the approximate location and ISP behind any public IP address.
SEO Tools

Meta Tag & SEO Snapshot

Pull the title, meta description, canonical URL, and Open Graph tags from any page.
Network Diagnostics

Ping Test

Test whether a host is reachable and measure round-trip time.
Network Diagnostics

Port Checker

Check whether a port on a public host is open — handy for verifying port forwarding.
Webmaster Tools

Redirect Checker

Trace a URL's full redirect chain, hop by hop.
Website Speed & Performance

Response Time & Header Checker

Measure server response time and inspect key response headers.
DNS Tools

Reverse DNS Lookup

Find the hostname (PTR record) associated with an IP address.
Webmaster Tools

Robots.txt & Sitemap Viewer

Fetch and read any site's robots.txt and listed sitemaps.
SSL & Security

SSL Certificate Checker

Check a site's SSL certificate, issuer, and expiry date.
Network Calculators

Subnet Calculator (CIDR)

Convert between CIDR notation and subnet masks, and see usable host ranges.
IP Address Tools

What Is My IP?

Find your public IP address, hostname, and IP version.
IP Address Tools

What Is My ISP?

Check which Internet Service Provider you're connected through.
IP Address Tools

What Is My Local IP?

Detect your private network IP address, right in your browser.
Network Diagnostics

What Is My Proxy?

See whether your connection is going through a forwarding proxy.
Webmaster Tools

What Is My User Agent?

Read your browser's user agent string, parsed into plain English.
WHOIS & Domain Tools

WHOIS Lookup

See registration details for any domain name.
WiFi & Router Tools

WiFi Network QR Code Generator

Turn your WiFi name and password into a scannable QR code.