TCP checks from France confirm whether a given port is open and reachable from OVH or DataCamp source IPs. OVH's AS16276 is one of the largest source ASNs in Europe by IP count, so a successful TCP check from Gravelines is strong evidence that your service is accessible to a significant portion of French and broader European traffic. OVH owns a large IPv4 block and is present in most IP allowlists maintained by enterprise firewall teams.

DataCamp's AS212238 has a different reputation profile. TCP checks to port 80 or 443 from the Paris node usually succeed without issue, but probes to less common ports — 22, 3306, 5432 — may be blocked by targets that restrict access based on source ASN reputation scores. This is not a problem with the French network; it reflects the target's firewall policy. Use the OVH node as the "clean" reference and DataCamp as the "what does a hosting-range IP see" test.

For testing SMTP reachability from France, the OVH node is the more relevant one. OVH operates its own mail infrastructure and has established relationships with major mail providers, so outbound port 25 from OVH IPs is generally treated as legitimate hosting traffic. TCP to port 25 from Gravelines will tell you whether your mail server accepts connections from French hosting networks — relevant if you're troubleshooting inbound mail delivery failures from OVH-hosted senders.

France has two nodes on this platform covering two distinct parts of the country and two very different network environments. The Gravelines node runs on AS16276, which is OVH SAS — the largest hosting provider in Europe by server count, headquartered in Roubaix in northern France. The Paris node runs on AS212238, operated by DataCamp Limited, a provider that focuses on bulletproof-adjacent hosting and operates in multiple European jurisdictions.

OVH's network is one of the more interesting in Europe. The company operates its own submarine cable and maintains extensive private fibre between its data centres in Roubaix, Gravelines, Strasbourg, and beyond. Gravelines is a purpose-built data centre campus about 40km west of Dunkirk, close to the Channel Tunnel corridor. OVH peers directly at most major European IXPs and carries a significant portion of its own transit, which means routing from Gravelines can look quite different from what you'd see on a standard transit-dependent host.

France-IX is the main French internet exchange, operating peering nodes in Paris, Lyon, and Marseille. The Paris node at France-IX handles the bulk of domestic and international peering for French networks. Paris sits roughly equidistant between London and Frankfurt, and the raw fibre distances translate to consistent latency: London to Paris typically runs 12ms, Paris to Frankfurt around 11ms, making Paris a natural midpoint for traffic flowing across the northern European backbone.

The southern France-IX nodes in Lyon and Marseille are important for Mediterranean and southern European traffic. Marseille in particular is a major submarine cable landing point — several cables connecting Europe to the Middle East, Africa, and Asia come ashore there. For traffic heading to those regions, routing via Marseille can be significantly faster than going north to Paris or Amsterdam first.

DataCamp Limited in Paris operates on a network that serves a range of hosting use cases, some of which attract abuse-focused traffic. This means the Paris node's source IP may behave differently from OVH when hitting targets with aggressive firewall rules or reputation-based blocking. Testing from both French nodes side by side is useful: if a target responds to OVH but not DataCamp, the issue is IP reputation or ASN-level blocking, not a general France connectivity problem.