$ curl https://ip4.dev/location/ type IP,then press `Enter`
{ ip: "8.8.8.8", continent_code: "NA",country: "United States", country_code: "US",country_code3: "USA", latitude: 37.751,longitude: -97.822, timezone: "America/Chicago",offset: -21600, asn: 15169,organization: "GOOGLE" }
curl https://ip4.dev/location?callback=jsonCb16081
jsonCb16081 ({ ip: "8.8.8.8", continent_code: "NA",country: "United States", country_code: "US",country_code3: "USA", latitude: 37.751,longitude: -97.822, timezone: "America/Chicago",offset: -21600, asn: 15169,organization: "GOOGLE" })
curl https://ip4.dev/myip
8.8.8.8
curl "https://ip4.dev/myip?format=json"
{"code":200,"data":"8.8.8.8" }
curl https://ip4.dev/myip?callback=jsonCb16081
jsonCb16081("8.8.8.8");