TCP checks from the Madrid node confirm whether a specific port is open and reachable from the Ohz Digital network in Spain. This is the right check when you need to verify that a service is accessible to Spanish users or from Spanish hosting infrastructure. TCP connection times from Madrid will be slightly higher than from central Europe due to the longer physical distances — expect TCP handshake times of 25–35ms to Paris or Frankfurt rather than the 9–12ms you'd see from Amsterdam.

Spain's gateway role for Latin American traffic means that TCP checks from Madrid are also relevant for services that need to handle connections from LATAM. If you're running a service that accepts connections from Latin American clients routed via Spain, a TCP check from Madrid gives you a rough sense of the network conditions those clients experience on the European leg of their connection.

Outbound TCP on certain ports may be filtered on some Spanish transit paths. Port 25 (SMTP) in particular is subject to blocking by some Spanish ISPs on consumer and small-business networks, though hosting ASNs like Ohz Digital typically maintain open outbound paths for legitimate hosting traffic. If a TCP check to port 25 fails from Madrid, verify whether the target is also unreachable from other European nodes before assuming a Spain-specific block.

Spain has a single node on this platform: Madrid, on AS202673, operated by Ohz Digital SL. Madrid is the primary internet hub for the Iberian Peninsula, home to ESPANIX and the DE-CIX Madrid peering point. The Spanish internet backbone is largely centralised in Madrid, with Barcelona as a secondary hub via CATNIX. For most international routing purposes, traffic in and out of Spain passes through Madrid.

Spain's geographic position gives it a unique role in European networking — it sits at the junction between Europe, North Africa, and Latin America. Several submarine cables connect Spain to the Americas, and Spanish carriers maintain direct relationships with major Latin American network operators. Madrid is the natural European gateway for traffic destined for Brazil, Argentina, Mexico, and the rest of LATAM, and CDN operators frequently use Spanish nodes as part of their LATAM serving strategy.

ESPANIX in Madrid is the primary Spanish IXP and handles the bulk of domestic peering between Spanish ISPs and content providers. DE-CIX operates a separate peering node in Madrid that connects Spanish networks to DE-CIX's broader European fabric, giving Madrid-connected networks access to thousands of peers across the DE-CIX platform without needing direct bilateral agreements. CATNIX in Barcelona serves Catalan and northeastern Spanish networks.

Latency from Madrid to the rest of Europe reflects the country's southwestern position. Madrid to Paris is typically around 25ms; Madrid to Frankfurt runs about 30ms; Madrid to Amsterdam is closer to 35ms. These are noticeably higher than intra-core-Europe numbers like Frankfurt to Amsterdam (9ms), simply because of the physical distance through France. To the US East Coast, Madrid shows RTTs around 100–110ms.

Ohz Digital SL is a Spanish hosting and transit provider operating in the Madrid market. The AS202673 network connects to Spanish and international transit providers and peers at ESPANIX and DE-CIX Madrid. Tests from this node reflect conditions typical of a mid-tier Spanish hosting ASN — useful for gauging reachability from Spanish commercial hosting infrastructure without the skew of a major incumbent like Telefónica.