How Iran's Internet Filtering Works in 2026
Iran operates one of the most sophisticated internet filtering systems in the world, managed primarily by the Telecommunication Infrastructure Company (TIC) under IRGC direction. The system uses multiple layers:
- IP blocklists — known VPN server IPs are blocked at the ISP level
- Deep Packet Inspection (DPI) — traffic pattern analysis to identify VPN protocols
- SNI filtering — blocking connections to specific domain names
- Throttling waves — selectively slowing international traffic during social unrest
During the filtering waves of 2022–2025 that followed protests, the TIC blocked virtually all standard VPN protocols: WireGuard, OpenVPN, IKEv2, and most commercial obfuscation methods. This left millions of Iranians without access to uncensored internet.
فیلترشکن ایران: What Iranians Actually Need
The term فیلترشکن (filter-breaker / VPN) in Farsi has become synonymous with internet freedom in Iran. But not all فیلترشکنها are equal. The ones that survive filtering waves share specific technical characteristics:
- Traffic that is forensically indistinguishable from HTTPS
- Servers that rotate IPs frequently or use CDN-fronted connections
- Protocols that work over both TCP and UDP
- Developer teams that respond quickly to new blocking techniques
Why VLESS+Reality Works in Iran
VLESS+Reality was specifically designed for high-censorship environments. Instead of trying to hide that you're using a VPN (which DPI eventually detects), it makes your VPN connection look exactly like a legitimate HTTPS connection to a real website.
The "Reality" component borrows the TLS certificate and handshake from a real, unblocked domain. From the DPI system's perspective, you're just browsing a normal website. There is no VPN signature to block.
NexTunnel uses VLESS+Reality as its primary protocol. During every major Iranian filtering wave between 2023 and 2026, NexTunnel connections remained active while NordVPN, ExpressVPN, and Proton VPN users reported widespread outages.
Hysteria2: When the DPI Switches to Throttling
Iran's filtering system sometimes shifts tactics from blocking to throttling — reducing international bandwidth to unusable speeds without fully blocking connections. This is particularly common during protests when authorities want to restrict communication without appearing to fully cut internet access.
Hysteria2 addresses this directly:
- Runs over UDP (different traffic path from TCP-based protocols)
- Uses aggressive retransmission to maintain throughput despite packet loss
- Designed specifically to function under hostile network conditions
NexTunnel automatically switches between VLESS+Reality (TCP) and Hysteria2 (UDP) based on which performs better on your current connection.
CDN Mode: The Nuclear Option
NexTunnel also offers a CDN mode that routes your connection through Cloudflare's network. Because Cloudflare powers a significant fraction of the global web, blocking Cloudflare IPs would take down major Iranian government and banking services — making it politically untenable to block.
How to Set Up NexTunnel in Iran
- Visit nextunnel.com. If the main domain is blocked, try the Tor onion address or ask support for the current mirror.
- Create an account. Pay with Bitcoin or USDT — no Iranian banking details required.
- Add a device in your dashboard and download the QR code.
- Install V2Box on iPhone or iPad, or v2rayNG on Android.
- Scan the QR code. You're now connected through VLESS+Reality.
- If speeds drop, switch to the Hysteria2 server in the app settings.
Comparison: فیلترشکنهای ایران 2026
| Service | Works during filtering wave | Farsi support | Crypto payment |
|---|---|---|---|
| NexTunnel | ✓ Yes | ✓ Yes | ✓ Yes |
| NordVPN | ✗ No | ✗ No | ✗ No |
| ExpressVPN | ✗ No | ✗ No | ✗ No |
| Lantern | Inconsistent | Partial | N/A (free) |
| Psiphon | Inconsistent | ✓ Yes | N/A (free) |