获取当前IP所属国家的免费接口

https://ipinfo.io/json

{
  "ip": "207.148.124.251",
  "hostname": "207.148.124.251.vultrusercontent.com",
  "city": "Singapore",
  "region": "Singapore",
  "country": "SG",
  "loc": "1.3215,103.6957",
  "org": "AS20473 The Constant Company, LLC",
  "postal": "627753",
  "timezone": "Asia/Singapore",
  "readme": "https://ipinfo.io/missingauth"
}