I created an IP database using Redis：

 Schema schema = new Schema()
   .AddNumericField(new FieldName("$.ipstart", "ipstart"))
   .AddNumericField(new FieldName("$.ipend", "ipend"));                     

  await ft.CreateAsync("idx:ipv4",
       new FTCreateParams().On(IndexDataType.JSON).Prefix("ipv4:"), schema);

  //add data 
  var json = new
     {
         ipstart = uint.Parse(data[0]),//ip range start
         ipend = uint.Parse(data[1]),//ip range end
         details = new
         {
             countrycode = string.IsNullOrEmpty(data[2]) ? null : data[2],
             state1 = string.IsNullOrEmpty(data[3]) ? null : data[3],
             state2 = string.IsNullOrEmpty(data[4]) ? null : data[4],
             city = string.IsNullOrEmpty(data[5]) ? null : data[5],
             postcode = string.IsNullOrEmpty(data[6]) ? null : data[6],
             latitude = double.Parse(data[7]),
             longitude = double.Parse(data[8]),
         }
     };

     await db.JSON().SetAsync($"ipv4:{count++}", "$", json);

then add this item:
"{"ipstart":16777472,"ipend":16778239,"details":{"countrycode":"CN","latitude":34.7732,"longitude":113.722}}"

But when I searched, there were no results:

`*> ft.search idx:ipv4 “@ipstart:[-inf 16777472]”

1. “0”

ft.search idx:ipv4 “@ipstart:[0 16777472]”

1. “0”

ft.search idx:ipv4 “(@ipstart:[0 16777472])”

1. “0”

ft.search idx:ipv4 “(@ipstart:16777472)”

1. “0”

ft.search idx:ipv4 “@ipstart:16777472”

1. “0”

ft.search idx:ipv4 “@ipstart:(16777472)”

1. “0”*`