TCP checks from the Netherlands attempt a three-way handshake to the target host and port, confirming whether the port is open and reachable from Dutch networks. Given the Netherlands' position at AMS-IX, most well-peered destinations are reachable with minimal latency and few routing anomalies. TCP connection times from Amsterdam to Frankfurt or London should closely match the raw ICMP RTT, with only a couple of milliseconds of extra overhead for SYN processing.

The Eygelshoven node is useful for TCP checks targeting services in the German Ruhr area or Belgium. Its transit paths differ from Amsterdam, so if a specific port is timing out from Eygelshoven but connecting fine from Amsterdam, you can narrow the issue to routing on the specific carrier serving that southern Netherlands location rather than a server-wide firewall rule.

Privacy-hosting ASNs in the Netherlands occasionally apply outbound firewall rules that limit certain port ranges. If a TCP check to port 25 or another less common port fails from FlokiNET or Ghosted.my but succeeds from Aluy or Trivox, check the hosting provider's acceptable use policy — outbound SMTP blocking on residential-adjacent hosting ASNs is standard practice. The failure tells you about the source network, not the target.

Amsterdam is the dominant internet hub in continental Europe. AMS-IX, the Amsterdam Internet Exchange, is the world's second largest IXP by traffic volume, consistently pushing past 10 Tbit/s at peak. The concentration of peering infrastructure, carrier-neutral colocation, and fibre density in the Amsterdam metropolitan area makes it a natural aggregation point for traffic moving between the UK, Germany, France, and Scandinavia.

The Netherlands hosts four nodes on this platform, all on distinct networks. Three are in Amsterdam: Aluy on AS211507 at Databarn DC, FlokiNET on AS200651, and Trivox on AS216078. A fourth node sits in Eygelshoven in the south of the country on AS204464 (Ghosted.my) at Skylink — a colocation facility near the Belgian and German borders that sees different transit paths to DE-CIX and BNIX compared to Amsterdam-based nodes.

Dutch data protection law and the general privacy-friendly regulatory environment have made the Netherlands a popular jurisdiction for hosting providers that handle sensitive or legally complex traffic. FlokiNET in particular is known for operating in privacy-conscious jurisdictions. This matters for network testing because privacy-oriented hosts often apply stricter outbound filtering, which can affect ICMP or UDP probe results.

Latency from Amsterdam to key European hubs is as short as it gets: roughly 9ms to Frankfurt, 12ms to London, 15ms to Paris. The short physical distances and high fibre density between Amsterdam, Frankfurt, and London mean that well-peered networks in the Netherlands face almost no avoidable latency on intra-European paths. Cross-Atlantic RTT to New York is typically in the 80–90ms range.

The Eygelshoven node adds a useful southern Netherlands perspective. That region sits within about 30km of Aachen and has direct connectivity options into Germany and Belgium. Path characteristics from Eygelshoven can differ noticeably from Amsterdam-originated tests, particularly for traffic heading south or east, making it a good complement when diagnosing routing issues in the Benelux-Germany border area.