Networking & Privacy Tools — by Category

Instantly see your public IPv4/IPv6, ISP, city and region.

Detailed IP, ASN, company and geolocation data.

Free IP geolocation JSON API for developers.

Authoritative routing, ASN and IP allocation data from RIPE NCC.

Query A, AAAA, MX, TXT, and more from Google's resolver.

Check DNS propagation across 20+ global locations.

MX, SPF, DKIM, DMARC and blacklist diagnostics.

Audit DNS and mail server configuration for any domain.

Speed plus latency, jitter and packet loss diagnostics.

Minimal speed test focused on streaming bandwidth.

Industry-standard download/upload/ping test.

Page-load timing breakdown for any URL.

Free browser that routes traffic through the Tor network.

No-logs VPN with anonymous account numbers.

Privacy-respecting search engine with no profiling.

See how trackable your browser is via fingerprinting.

Check if your email appears in known data breaches.

Scan files and URLs with 70+ antivirus engines.

Sandbox scans of suspicious URLs and phishing pages.

Grade any HTTPS site's TLS configuration.

Default admin logins for hundreds of router models.

Visualize Wi-Fi channels and find the cleanest one.

Open-source firmware for supported home routers.

HTTP request/response inspection endpoints.

Grade any site's HTTP security headers.

Free fake REST API for prototyping.

Core Web Vitals and performance diagnostics.

Send a test email to get a spam-readiness score.

Inspect, build and validate DMARC records.

See how Gmail treats mail from your domain.

The web platform reference for developers.

Clear explainers on DNS, CDNs, DDoS and more.

Browse RFCs that define how the internet runs.

Governance of domain names and IP allocation.