TCP checks from Singapore attempt a full three-way handshake to your specified host and port, reporting connection time and success or failure. Unlike ICMP ping, TCP probes follow the same firewall rules and routing policies that real application traffic uses. This makes TCP checks the correct tool for confirming whether a port is reachable from Singapore-based networks — useful for services targeting Southeast Asian users.

Singapore carrier networks generally do not apply outbound port filtering beyond standard residential SMTP blocking on port 25. The FDCservers node is a hosting network, not a residential ISP, so port 25 and other commonly restricted ports should be reachable in the outbound direction. If a TCP check from Singapore fails to a port that is open from other regions, the most likely causes are geo-blocking by the target, a firewall rule blocking the FDCservers ASN (AS30058), or asymmetric routing dropping return packets.

TCP testing from Singapore is particularly useful for operators running services in Indonesia, Malaysia, and the Philippines who want to verify reachability across the region from a single well-connected node. Because Singapore peers with nearly every major Southeast Asian carrier, a clean TCP result from this node is a strong indicator that the port is reachable from the broader ASEAN user base — though each country's specific carrier path should still be verified independently where precision matters.

Singapore is the primary internet hub for Southeast Asia. Almost every submarine cable system serving the region either lands directly in Singapore or transits through it. SEA-ME-WE 3, SEA-ME-WE 4, SEA-ME-WE 5, APG, AAG, and SEAX-1 are among the systems with cable landing stations on the island. This concentration of cable infrastructure, combined with political neutrality and strong rule of law, has made Singapore the de facto interconnection point for traffic flowing between Asia, the Middle East, and Europe.

The Equinix SG1–SG5 campus in Singapore functions as the main carrier hotel and IX hub. Equinix Singapore hosts the SGIX peering fabric alongside its own Equinix Internet Exchange fabric. DE-CIX also operates a neutral exchange here, giving networks a third independent peering option. The density of networks collocated in this one campus means that most intra-regional traffic — between Singapore, Malaysia, Indonesia, Thailand, and the Philippines — crosses through Equinix without needing to exit the building.

Our probe node in Singapore runs on AS30058 (FDCservers). FDCservers is a US-based colocation and hosting provider with a Singapore point of presence. The node sits inside the Singapore market connected to local transit and peering, which means test results reflect realistic hosting network conditions rather than a direct telco backbone. Typical Singapore-to-Hong Kong RTT is around 30 ms; Singapore-to-Tokyo is around 65–70 ms; Singapore-to-Sydney is around 85 ms; Singapore-to-Frankfurt is around 170 ms.

Domestic network infrastructure in Singapore is highly developed for a city-state of its size. Singtel (AS7473), StarHub (AS4657), and M1 (AS9534) are the three main local carriers. Each maintains direct peering at the Equinix campus and provides transit services to smaller ISPs and hosting providers. Because Singapore is geographically compact, latency between any two points on the island is negligible — inter-carrier variation is driven by peering policy rather than physical distance.

Singapore's position matters for tests directed at Southeast Asian users. A server with sub-20 ms response times from the Singapore node is well-placed for the ASEAN market. Tests from Singapore to targets in Indonesia (Jakarta ~15 ms), Malaysia (Kuala Lumpur ~15 ms), and Thailand (Bangkok ~35 ms) provide a practical gauge of how regional content delivery is performing. If you serve users across the region, Singapore is the single most representative test vantage point available.