--- title: "What Is WireGuard? The Modern VPN Protocol Explained | vpnrank.io" description: "WireGuard is a modern open-source VPN protocol that's faster and leaner than OpenVPN — about 4,000 lines of code, ChaCha20 encryption, and near-instant connections. How it works and why most top VPNs build on it." url: https://vpnrank.io/glossary/wireguard language: en --- [VPN Glossary](https://vpnrank.io/glossary) # What Is WireGuard? WireGuard is an open-source VPN protocol designed for simplicity and speed. At roughly 4,000 lines of code (versus hundreds of thousands for OpenVPN/IPsec stacks), it is dramatically easier to audit, connects in milliseconds, and delivers significantly higher throughput using modern cryptography — ChaCha20 for encryption and Curve25519 for key exchange. It has been part of the Linux kernel since version 5.6 (2020). ## Why WireGuard replaced OpenVPN as the default [OpenVPN](https://vpnrank.io/blog/wireguard-vs-openvpn-vs-ikev2-vpn-protocols-explained), the previous standard, carries two decades of accumulated complexity: a large codebase, TLS dependency, and performance limited by user-space packet processing. [WireGuard](https://vpnrank.io/blog/wireguard-protocol-explained) was designed from scratch by Jason A. Donenfeld with the opposite philosophy — a minimal, formally-verifiable protocol with fixed, modern cryptographic choices instead of negotiable cipher suites. The practical results: connections establish near-instantly (critical when your phone hops between WiFi and cellular), throughput is typically 2-4× OpenVPN on the same hardware, and battery cost on mobile devices is significantly lower. In our reference benchmark, every top-performing VPN runs a WireGuard-family protocol. ## NordLynx, Lightway, and other WireGuard derivatives Stock WireGuard has one privacy wrinkle for consumer VPN use: by design it stores connected peers' [IP addresses](https://vpnrank.io/glossary/ip-address) in server memory. Providers address this with engineering on top: [NordVPN](https://vpnrank.io/reviews/nordvpn)'s NordLynx adds a double-NAT system so user IPs aren't tied to tunnel sessions; other providers wipe peer state aggressively. [ExpressVPN](https://vpnrank.io/reviews/expressvpn)'s Lightway is not WireGuard but a parallel effort with the same philosophy — a minimal modern protocol (built on wolfSSL, now open source) optimized for fast reconnection and mobile use. When this site refers to 'WireGuard-family' protocols, it means WireGuard, NordLynx, Lightway, and similar minimal modern designs. ## Limitations WireGuard is UDP-only, which means it can be blocked by networks that allow only TCP — restrictive corporate firewalls and national filtering systems detect and drop it relatively easily. That's why providers keep OpenVPN-TCP (which can masquerade on port 443 as HTTPS) and proprietary obfuscated protocols as fallbacks for hostile networks. ## Frequently Asked Questions Is WireGuard safe? Yes — its small codebase has been formally analyzed and is widely considered one of the most trustworthy VPN protocols available. Its cryptographic choices (ChaCha20-Poly1305, Curve25519, BLAKE2s) are modern and conservative. The main caveat is the peer-IP memory behavior, which serious providers mitigate with double-NAT or aggressive state clearing. Is WireGuard faster than OpenVPN? Substantially. On identical hardware, WireGuard typically delivers 2-4× OpenVPN's throughput and connects in milliseconds rather than seconds. In our benchmark, WireGuard-family protocols retain 75-85% of a 1 Gbps line versus 40-60% for OpenVPN. Which VPNs use WireGuard? Nearly all top providers: NordVPN (as NordLynx), Surfshark, Proton VPN, PIA, CyberGhost, and IPVanish all offer WireGuard. ExpressVPN uses Lightway, its own protocol with the same design goals. When should I NOT use WireGuard? On networks that block UDP traffic or use deep packet inspection to drop VPN protocols — some corporate networks, and national firewalls in China, Iran, and similar markets. There, OpenVPN-TCP on port 443 or a provider's obfuscated protocol works where WireGuard won't. ## Related Terms [VPN](https://vpnrank.io/glossary/vpn) [VPN Kill Switch](https://vpnrank.io/glossary/kill-switch) [No-Logs Policy](https://vpnrank.io/glossary/no-logs-policy) ## Related Guides [VPN Speed Test Results](https://vpnrank.io/vpn-speed-test) [Best Fastest VPNs](https://vpnrank.io/best-vpn/fastest-vpn) [How We Test VPNs](https://vpnrank.io/how-we-test) Structured data (JSON-LD): ```json {"@context":"https://schema.org","@type":"Organization","@id":"https://vpnrank.io/#organization","name":"VPNRank","alternateName":"vpnrank.io","url":"https://vpnrank.io","email":"hello@vpnrank.io","logo":{"@type":"ImageObject","url":"https://vpnrank.io/logos/favicon.png","width":500,"height":500},"description":"Independent VPN comparison. 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