How can I get the IP address of the current request in Blazor?

You can use a third-party API, such as Ipify, to get the IP address of the current request in Blazor. The script api.ipify will return the IP address in JSON format. But this is a workaround. As of now, there is no way to achieve this. In the following code snippet, the IP address will be retrieved from the Ipify API through a JS interop call to the Blazor server.

[_Host.cshtml/index.html]

<script>
function GetAddress() {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "https://api.ipify.org?format=jsonp&callback=DisplayIP";
    document.getElementsByTagName("head")[0].appendChild(script);
};
function DisplayIP(response) {
    document.getElementById("text").innerHTML = "Your IP Address is " + response.ip;
}
</script>

[index.razor]

@page "/"
@inject IJSRuntime jsRuntime

<button @onclick="GetIp">Get IP!!!</button>
<textarea id="text" style="width:50%;height:40px;" />

@code{
          public async Task GetIp()
          {
                 await jsRuntime.InvokeAsync<object>("GetAddress");
          } 
}