TCP checks from Indonesia attempt a three-way handshake to the target port from the Google LLC node in Jakarta. AS396982 is a well-known and clean ASN with no IP reputation issues on standard hosting and cloud platforms. TCP connection times from Jakarta to Singapore should be around 15 ms; to Hong Kong around 45 ms; to Sydney around 60 ms. These low regional figures reflect Indonesia's strong submarine cable connectivity to its nearest neighbors.

A key use case for TCP checks from Indonesia is verifying that services critical to the Indonesian market — payment processors, identity verification APIs, logistics platforms — are reachable from a Jakarta network. E-commerce operations in Indonesia depend on real-time connections to external services, and a TCP check from this node quickly confirms whether a required port is open and the connection time is within acceptable bounds for the application's timeout parameters.

TCP checks from Indonesia to targets in Australia are notably fast compared to other Southeast Asian origins — the Jakarta-Sydney RTT of around 60 ms reflects the direct submarine cable path (JASUKA, SEA-US, Indigo-West) between Indonesia and Australia. If TCP connection times from Jakarta to Sydney are significantly above 60 ms, it suggests the path is not taking the direct cable route and is transiting via Singapore or another intermediary, adding unnecessary hops. An MTR from the same origin will confirm which path is being taken.

Indonesia is the fourth largest internet market in the world by number of users, with over 200 million active internet users. The country is an archipelago of over 17,000 islands, which creates unusual infrastructure challenges — submarine cables connect the major islands (Java, Sumatra, Kalimantan, Sulawesi), but terrestrial fibre density outside Java is significantly lower than in comparable population-size markets. Java, and specifically Jakarta, concentrates the overwhelming majority of the country's internet exchange capacity and international connectivity.

IIX (Indonesia Internet Exchange) in Jakarta is the main national IX, operated by APJII (the Indonesian ISP Association). OpenIXP and JK-IX operate as independent neutral exchanges in Jakarta alongside IIX, giving networks peering options without being dependent on a single fabric. Despite three exchanges being present, a significant share of intra-Indonesian traffic still exits via Singapore for inter-ISP routing — a known inefficiency in the market that APJII has been working to reduce by expanding IIX participation and capacity.

Our probe node in Indonesia runs on AS396982 (Google LLC) in Jakarta. Google Cloud has a region in Jakarta (asia-southeast2), making Indonesia one of the few Southeast Asian markets outside Singapore with a direct Google Cloud presence. The AS396982 node benefits from Google's private backbone for inter-region traffic. Reference RTTs from this node: Jakarta to Singapore ~15 ms, to Hong Kong ~45 ms, to Sydney ~60 ms, to Tokyo ~80 ms, to Mumbai ~70 ms, to Frankfurt ~185 ms, to Los Angeles ~190 ms.

The dominant Indonesian carriers are Telkom Indonesia (AS17451, the incumbent) and its subsidiary Telkomsel, Indosat Ooredoo (AS4761), and XL Axiata (AS24203). Telkom operates the national backbone (NUSANTARA-21) connecting the main islands via domestic submarine cable. Most international capacity exits via Telkom's cable landing stations, which connect to Singapore — Jakarta to Singapore is only 15 ms, and the Singapore-based IX ecosystem (Equinix SG) effectively serves as the international peering layer for Indonesian carriers.

Testing from Jakarta is relevant for operators serving the Indonesian internet market. With 200+ million users and a rapidly expanding middle class driving e-commerce and streaming adoption, Indonesia is an important market for regional services. The 15 ms Jakarta-Singapore RTT means that Singapore-hosted services perform well for Indonesian users, but local Jakarta hosting (as with the Google Jakarta region) offers a further latency advantage, particularly for latency-sensitive applications like gaming, video calling, and financial transactions.