# IdSpan Properties

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.idspan/)

## IsDefault {#isdefault-2fd339ce}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.idspan/properties/isdefault-2fd339ce/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/IdSpan.cs#L75)

```csharp
public bool IsDefault
```

Gets a value indicating whether this instance is the default value.

## Value {#value-9d5e57a1}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.idspan/properties/value-9d5e57a1/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/IdSpan.cs#L70)

```csharp
public ReadOnlyMemory<byte> Value
```

Gets the underlying value.