TCP checks from Hong Kong attempt a three-way handshake to the specified host and port and record whether the connection succeeded and how long it took. The Google LLC network (AS396982) is a well-routed, globally recognized ASN unlikely to be blocked by IP reputation filters on most hosting platforms. This makes TCP checks from this node a reliable indicator of whether a port is genuinely reachable from Hong Kong carrier networks.

A common use case is verifying game server or streaming endpoint reachability from the Hong Kong market. Hong Kong is one of the most active gaming and media markets in Asia — latency and reachability to HK users matters for operators targeting that audience. A clean TCP connection on port 443, 8443, or a custom game port from this node is a good indicator of service availability from the broader Cantonese-speaking internet population.

If TCP checks from Hong Kong fail while succeeding from Singapore or Tokyo, the most likely explanation is either geo-blocking (some services restrict HK ASNs), a firewall rule targeting the Google LLC source range, or a routing issue specific to the HK-to-target path. The first step is to cross-reference against the MTR check, which will show whether the connection is failing early (at the first carrier hop) or late (at the target or just before it).

Hong Kong is one of the most important internet interconnection points in Asia. HKIX, the Hong Kong Internet Exchange, is hosted at The Chinese University of Hong Kong and consistently ranks among the busiest IXPs in Asia by member count, connecting hundreds of networks including regional carriers, international CDNs, and cloud providers. The combination of HKIX and the Equinix HK campus gives Hong Kong a dense peering ecosystem, making it a natural transit hub between Northeast and Southeast Asia.

Hong Kong is a major landing point for submarine cable systems crossing the Pacific and the South China Sea. APCN2, TGN-IA (formerly FLAG Asia), SJC (South-East Asia Japan Cable), and ASE (Asia Submarine-cable Express) all have landing stations in Hong Kong. These cables provide diverse, redundant paths to Japan, Taiwan, the Philippines, Singapore, and the US West Coast. The geographic position — between mainland China, Taiwan, Japan, and Southeast Asia — makes Hong Kong a natural aggregation point for Asia-Pacific transit.

Our probe node in Hong Kong runs on AS396982 (Google LLC). Google's global network (AS396982) is used for Google's own infrastructure deployments including Google Cloud Platform nodes. Traffic from this ASN benefits from Google's private backbone, which bypasses public internet transit for inter-region communication wherever Google has capacity. Typical RTTs from this node: Hong Kong to Singapore ~30 ms, to Taipei ~30 ms, to Tokyo ~50 ms, to Sydney ~100 ms, to Frankfurt ~170 ms, to New York ~200 ms.

Domestic carriers in Hong Kong include PCCW Global (AS3491), HGC Global Communications (AS9304), and China Mobile HK (AS58453). Each maintains presence at HKIX and connects to the Equinix campus. PCCW Global in particular operates one of the largest pan-Asian backbone networks and is a key transit provider for traffic between Hong Kong and mainland China — a segment that has distinct routing characteristics due to the Great Firewall filtering that applies at the China border.

Hong Kong's network position has remained stable despite political changes since 2020. Physical cable infrastructure, IX membership, and peering agreements are unchanged at the technical level. HKIX continues to operate independently at CUHK. For operators targeting users in Greater China, Hong Kong is the critical test vantage point — it gives you clean visibility into routing quality for the last leg into or out of the Chinese mainland network, without being subject to the filtering that applies inside China itself.