Explore the library

Understand VPNs. Check the details.

A practical reference for VPN protocols, provider documentation and network tools. Learn how connections work, compare documented features and check configurations with clear sources and limits.

Protocol referenceVPN brand directoryNetwork tools
A VPN tunnel connects a device to a VPN server; the website connection continues beyond the server.
The VPN tunnel ends at the VPN server. HTTPS separately encrypts the website connection.

Protocol reference

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IKEv2 / IPsecUDP 500 / 4500 · IPsecL2TP / IPsecUDP / IPsecLightwayProvider implementationOpenVPNUDP / TCPShadowsocksTCP / UDPSSTPHTTPS / TCP 443WireGuardUDP

VPN brand directory

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E

ExpressVPN

The developer of Lightway, with a published protocol core and implementation documentation.

Brand profile
I

IVPN

A provider documenting email-free accounts and open-source clients.

Number-based accountMain client repositories
Brand profile
M

Mullvad

A number-based account model, without an email requirement at registration.

Number-based accountMain client repositories
Brand profile
N

NordVPN

A VPN provider with desktop and mobile applications and a broad feature catalogue.

Brand profile
P

Proton VPN

A provider with a documented free plan and open-source applications.

Free planMain client repositories
Brand profile
S

Surfshark

A VPN provider whose platform-specific features should be checked in its official documentation.

Brand profile

Network tools

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DNS lookup

Queries use Google Public DNS. This is a public resolver lookup, not a test of your device’s DNS tunnel.

IP address inspector

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Subnet calculator

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WireGuard configuration check

Processed in your browser. The input is not sent to our server.