If you have been researching Hong Kong VPS hosting for China-facing applications, you have encountered the terms CN2 GIA and CN2 GT. Both describe premium China Telecom network routes, and both are marketed as superior to standard internet connectivity to mainland China. But they are not equivalent — and choosing the wrong one can mean the difference between a fast, reliable connection and a degraded experience during peak hours.
This guide explains exactly what CN2 GIA and CN2 GT are, how they differ technically, and which you should choose for your Hong Kong VPS.
Background: China’s Internet Routing Tiers
Mainland China’s internet is served by three major operators: China Telecom, China Unicom, and China Mobile. Of these, China Telecom operates the most important network for international traffic routing — with two distinct backbone products:
- 163 backbone (AS4134) — the standard China Telecom internet route, used by most hosting providers. This is the congested, lower-priority path.
- CN2 backbone (AS4809) — China Telecom’s premium next-generation network. CN2 has two tiers: CN2 GT and CN2 GIA.
What Is CN2 GT?
CN2 GT (Global Transit) is the entry-level CN2 product. Traffic on CN2 GT routes through AS4809 for the international segment but may transition back to the standard 163 network (AS4134) for last-mile delivery within mainland China.
In practical terms, CN2 GT is:
- Better than standard 163 routing during off-peak hours
- Subject to congestion during peak hours (18:00–24:00 CST) as traffic merges onto shared 163 infrastructure
- Lower cost than CN2 GIA for hosting providers
- Suitable for light use cases where occasional latency spikes are acceptable
What Is CN2 GIA?
CN2 GIA (Global Internet Access) is China Telecom’s highest-tier network product. Traffic on CN2 GIA routes exclusively through AS4809 end-to-end — from your Hong Kong server through the border, across China’s backbone, and to the last-mile delivery point — without ever touching the congested 163 network.
CN2 GIA is:
- Low and consistent latency throughout the day, including peak hours
- Near-zero packet loss under normal conditions
- Higher cost for hosting providers (passed through in VPS pricing)
- The appropriate choice for any production application serving mainland Chinese users
Technical Comparison
| Characteristic | Standard 163 (AS4134) | CN2 GT | CN2 GIA (AS4809) |
|---|---|---|---|
| BGP AS Number | AS4134 | AS4809 (partially) | AS4809 (end-to-end) |
| Peak-hour latency (HK→Shanghai) | 80–150ms | 45–90ms | 28–42ms |
| Off-peak latency (HK→Shanghai) | 40–70ms | 30–50ms | 28–40ms |
| Peak-hour packet loss | 5–20% | 1–5% | <0.1% |
| Latency consistency | Poor | Moderate | Excellent |
| Congestion susceptibility | High | Moderate | Low |
| Typical cost premium | None (baseline) | Low | Moderate |
How to Identify Which Route Your VPS Uses
You can verify your VPS routing with a traceroute to a mainland China IP address. The BGP AS numbers in the path reveal which network you are on.
# Install mtr (better traceroute)
apt install mtr -y
# Traceroute to a China Telecom IP
mtr --report 202.97.0.1Interpreting the results:
- Only AS4809 hops — you have CN2 GIA routing. Pure premium path.
- AS4809 initially, then AS4134 — you have CN2 GT. Transitions to 163 network for last-mile.
- Only AS4134 hops — standard 163 routing. No CN2 involvement.
- AS4837 hops — China Unicom backbone. Different carrier, not China Telecom CN2.
Look for hostname patterns: nodes with hostnames containing 202.97 or 59.43 IP prefixes indicate AS4809 (CN2). Nodes with 202.96 or 61.182 prefixes indicate AS4134 (163).
Real-World Performance Impact
E-Commerce Conversion Rates
For a WooCommerce store with mainland Chinese customers, the difference between CN2 GIA and CN2 GT routing becomes measurable in conversion rates. Research consistently shows that each 100ms of additional page load time reduces e-commerce conversion rates by approximately 1%. A 50ms latency improvement from CN2 GT to CN2 GIA translates directly to fewer abandoned carts.
Real-Time Applications
For live chat, video conferencing APIs, WebSocket-based collaboration tools, or online gaming, CN2 GIA’s packet-loss advantage is critical. A 5% packet loss rate on CN2 GT during peak hours causes visible degradation in real-time applications — audio dropouts, delayed message delivery, connection timeouts. CN2 GIA’s sub-0.1% loss rate eliminates these issues.
API Response Times
For SaaS applications with mainland Chinese users making API calls, CN2 GIA’s consistent 30–40ms latency versus CN2 GT’s variable 45–90ms means API calls complete reliably within timeout budgets. This matters particularly for payment processing and authentication flows where timeouts cause user-visible errors.
When Is CN2 GT Acceptable?
CN2 GT is an acceptable choice for:
- Development and staging environments where peak-hour degradation doesn’t affect end users
- Applications where mainland Chinese users are a small secondary audience (less than 10% of traffic)
- Very latency-tolerant applications: email delivery, batch data sync, file backup
- Budget-constrained projects where the cost difference between CN2 GT and CN2 GIA is material
When CN2 GIA Is Essential
CN2 GIA is the required choice for:
- Any application where mainland China is a primary market
- E-commerce stores selling to Chinese consumers
- Real-time applications: gaming, live streaming, video conferencing, WebSocket applications
- Financial applications: trading platforms, payment processing, banking APIs
- SaaS products with Chinese enterprise customers who have SLA requirements
- Any application where you are selling on performance as a differentiator
What About China Unicom BGP (AS9929 / AS10099)?
Some hosting providers also offer China Unicom Premium routes via AS9929 (ChinaNet Next Generation) or AS10099 (China Unicom International). These serve the same function as CN2 GIA but for China Unicom subscribers rather than China Telecom subscribers.
For maximum coverage across all Chinese ISPs (China Telecom, China Unicom, and China Mobile), some providers offer multi-ISP BGP routing that combines CN2 GIA for Telecom users with premium Unicom routing for Unicom users. This is particularly valuable for high-traffic applications where the user base spans multiple Chinese ISPs.
CN2 GIA and the Great Firewall
CN2 GIA routing improves performance to mainland China but does not bypass Great Firewall filtering. Content accessible in Hong Kong that is blocked in mainland China remains blocked regardless of routing quality. CN2 GIA simply ensures that permitted traffic — business websites, API calls, SaaS applications — travels the best possible path through the firewall inspection points.
Latency improvement from CN2 GIA comes from avoiding congestion on the 163 backbone, not from bypassing inspection. Inspection latency at the border is already accounted for in the 28–42ms Hong Kong-to-Shanghai figures quoted above.
Conclusion
The difference between CN2 GIA and CN2 GT is not marketing — it is an end-to-end routing architecture difference with measurable, consistent performance implications. CN2 GIA routes exclusively through AS4809 with near-zero packet loss and stable latency throughout the day. CN2 GT transitions to the congested 163 network for last-mile delivery, resulting in latency spikes and packet loss during peak hours.
For any production application serving mainland Chinese users, CN2 GIA is the correct choice. The latency advantage over CN2 GT is consistent, the packet loss difference is decisive for real-time applications, and Server.HK includes CN2 GIA routing as standard on all Hong Kong VPS plans — not as a premium add-on.
Get CN2 GIA routing as standard: Browse Server.HK Hong Kong VPS plans — all plans include CN2 GIA routing with no additional fee.