🇲🇫St. Martin IP addresses

What a lookup returns for St. Martin

The country block is filled in from the address itself — you do not pass the country in. Region, city and network vary per address.

{
  "ip": "203.0.113.42",
  "location": {
    "country": {
      "name": "St. Martin",
      "code": "MF",
      "capital": "Marigot",
      "phoneCode": "+590",
      "flag": "🇲🇫"
    },
    "region": { "name": "…", "code": "…" },
    "city": "…",
    "latitude": 0.0,
    "longitude": 0.0,
    "accuracyRadius": 50
  },
  "connection": { "asn": 0, "isp": "…", "org": "…" }
}

Largest networks in St. Martin

The operators holding the most IPv4 address space that geolocates to St. Martin, from the same data that answers a lookup.

IPv4 only — mixing in IPv6 would make any address count meaningless, since a single IPv6 block can hold more addresses than the entire IPv4 internet. Ranked by where networks are observed, which is not always where they are registered.

How accurate is geolocation in St. Martin?

Country-level accuracy is reliable — the address blocks allocated to networks operating in St. Martin are well documented by the regional registry. City-level accuracy is not a guarantee anywhere: an address is mapped to where its network announces it, which is often a provider hub rather than the user's suburb.

Every response carries an accuracyRadius in kilometres. Treat the coordinates as the centre of a circle that size, not as a pin. Mobile and corporate connections in St. Martin routinely resolve to a different city entirely, and anyone on a VPN will resolve wherever the exit node sits.

Common uses

• Showing prices in the local currency and applying the right tax treatment for visitors from St. Martin.
• Defaulting the country and calling code (+590) on sign-up forms so people are not scrolling a list of 200.
• Meeting content licensing or regulatory rules that differ by country.
• Flagging logins from an unexpected country during fraud review.