The Best Test-IPv6 Alternatives in 2026

IPv6 Leak Test checks whether a device has IPv6 connectivity and displays connection information related to privacy.

Proxy Check provides a proxy detection API for identifying proxy connections used in online services and game servers.

Check browser fingerprints and run DNS leak, IP, port, and WebRTC tests with BrowserScan.

Spur analyzes internet infrastructure and network signals to help investigators interpret obfuscated connections.

IP Intelligence detects proxies and VPN connections through an API intended to help prevent fraud.

Manage Windows Firewall rules and receive outbound connection notifications with Windows Firewall Control.

The Hitch proxy handles TLS connections for Varnish and is described by its project as open source.

Test a browser for privacy leaks, including exposed IP addresses, device information, and fingerprinting risks.

WhatsMyDNS checks DNS record propagation across global resolvers for record types including A, AAAA, MX, and TXT.

Check the Toronto Hydro outage map for electricity service disruptions.

Test how trackers and fingerprinting systems see your browser with Cover Your Tracks from the EFF.

GNUnet provides tools for decentralized communication through a secure peer-to-peer networking framework.

Discover hosts and map networks with Nmap, a network exploration and security scanning tool.

Zeek analyzes network activity through an open source monitor with a flexible scripting language.

Kismet monitors and captures Wi-Fi network traffic, with wireless intrusion detection and wardriving features.

Look up DNS records and nameservers with NSLookup.io’s network utilities.

Explore ntop’s network visibility and cybersecurity offering; the supplied page gives little further detail.

Test browser fingerprinting characteristics with CreepJS, which displays fingerprint and WebRTC results.

Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.

SSL Labs provides tools for testing SSL and TLS configurations and related public key infrastructure.

Test HTTP security headers such as CSP and HSTS, then review recommendations for improving a site.

Intercept, inspect, and edit HTTP(S) traffic with HTTP Toolkit for debugging and testing.

Analyze a website with Web Check, an all-in-one tool described as an OSINT utility.

Terminate TLS connections through Hitch, a scalable TLS proxy from Varnish Software.