There are actually some public services that you can test your public IP easily, for example, ipinfo.io for global users and ipip.net for Chinese users.

ipinfo.io

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curl ipinfo.io

You will get a response in JSON, including your current city, region, country, organization, etc.

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{
  "ip": "12.34.56.78",
  "hostname": "No Hostname",
  "city": "",
  "region": "",
  "country": "US",
  "loc": "37.7510,-97.8220",
  "org": "AS7018 AT&T Services, Inc."
}

ipip.net

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curl myip.ipip.net

You will get a plain text response, including your current city, country, ISP, etc.

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当前 IP：16.221.25.51  来自于：中国 上海 上海电信