| Full name | China Unicom |
| ASN | AS4837 |
| Type | National ISP / Telecom |
| Country | China |
| Headquarters | Beijing, China |
| Founded | 2000 |
| Website | chinaunicom.com |
| Registry | APNIC |
| Total IPs | ~80 million (IPv4) |
| Upstream | National backbone with controlled international peering |
| IPv6 | 2408::/12 |
| RIR | APNIC |
| Abuse email | abuse@chinaunicom.cn |
| Abuse form | Report abuse → |
AS4837 is China Unicom's primary backbone ASN — the second-largest ISP in China. China Unicom primarily serves northern China while China Telecom dominates the south. Together they form the core of China's internet backbone along with China Mobile. Like all Chinese ISPs, China Unicom operates under the Great Firewall regulations.
Every time you visit a website, your IP address — and therefore your ISP (China Unicom) — is visible to that site. China Unicom as your ISP can see all unencrypted traffic passing through their network, including the domains you visit. This is standard practice for all ISPs and is typically used for network management, legal compliance, and in some cases targeted advertising.
If your device is assigned an IP in China Unicom’s ranges, websites you visit will identify your connection as coming from China Unicom. To prevent this, a VPN replaces your ISP-assigned IP with the VPN server’s IP, making your traffic appear to come from a different provider entirely.
AS4837 is registered with APNIC — the Regional Internet Registry responsible for IP allocations in the Asia Pacific region. The ASN is used to announce IP prefixes to the global BGP routing table, allowing other networks to route traffic to China Unicom’s infrastructure.
China Unicom peers with major transit providers and internet exchanges to ensure global reachability. BGP peering relationships determine how traffic flows between China Unicom and the rest of the internet.
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