Best SNI for VLESS + Reality in Iran — How to Choose One That Lasts
If you run VLESS + Reality in Iran, the single most important setting you control is the SNI (Server Name Indication). A good SNI keeps your connection alive for weeks; a bad one gets flagged in days. This guide explains how to pick one that lasts — not a throwaway list of domains that stops working next month.
What SNI does in Reality
SNI is the hostname your client announces at the start of a TLS handshake. In ordinary HTTPS it tells the server which certificate to serve. In Reality, it does something cleverer: your traffic genuinely completes its handshake against a real, popular website and only then gets redirected to your server. To Iran's filtering, your VPN session looks indistinguishable from someone visiting that real site.
That means the SNI isn't cosmetic — it is your cover story. If the cover site is trustworthy and widely used, blocking it would cause collateral damage, so the filter leaves it alone.
What makes a good SNI
Don't chase a "magic domain." Chase the properties that make a domain durable:
- High traffic, hard to block. A domain that millions of Iranians legitimately use means the filter pays a real cost to block it. That cost is your protection.
- Backed by a major CDN. Domains served from large CDNs are resilient and share IP space with countless other sites, making IP-based blocking expensive.
- Supports TLS 1.3. Reality requires it. Older domains stuck on TLS 1.2 won't work.
- Not already filtered in Iran. If the cover site itself is blocked, your handshake fails. Pick something that loads normally on your operator.
- Foreign-hosted, not an Iranian site. Domestic domains route inside Iran and defeat the purpose.
How to test an SNI before trusting it
- Confirm the candidate domain opens normally on your own operator (Irancell, MCI, Hamrah Aval), without a VPN.
- Check it serves TLS 1.3 (most modern CDN-backed sites do).
- Set it as your Reality SNI, connect, and use it during peak filtering hours (roughly 8–11 PM Tehran time) for a couple of days.
- If it stays stable through peak hours, it's a keeper. If it drops, rotate to another candidate.
Common mistakes
- Copying a public "best SNI 2026" list. Those lists circulate widely, get over-used, and burn out fast. The properties above outlast any list.
- Using a niche or low-traffic domain. Easy to block with zero collateral damage.
- Mismatching SNI and server config. The SNI in your client must match what the server's Reality setup expects, or the handshake fails — see our guide on handshake errors.
- Picking a domain that's already censored. It won't load, so neither will your tunnel.
The easier path: let the provider handle it
Choosing, testing, and rotating SNIs is real work. A serious Iran-focused provider does this for you — it ships Reality configs with healthy SNIs already chosen, and rotates them behind your subscription URL when conditions change, so you never edit a config by hand. That's the difference between a hobby setup and a service built for Iran.
Frequently asked questions
Can I just reuse the same SNI forever? Sometimes for months, sometimes not. Network conditions change. The durable approach is to pick by the properties above and rotate when a domain weakens, rather than marrying one name.
Does the SNI affect my speed? Barely. SNI is about survivability, not throughput. Server location and protocol matter far more for speed — see V2Ray explained.
Is Reality better than plain VLESS + TLS? For Iran, yes — Reality removes the fake-certificate fingerprint that smart filtering looks for. That's why SNI choice matters so much.
Read next
- V2Ray Explained — Why It's the Best Protocol for Iran
- Best VPN for Iran in 2026 — Practical Buyer's Guide
Don't want to manage SNIs yourself? Try v2route's 24-hour free trial — Reality configs come with healthy SNIs already set and rotated for you. Disclosure: this site is part of that service.