---
title: nd_opt_pref64
framework: Kernel
role: symbol
platforms: [macOS 12.0+]
path: kernel/nd_opt_pref64
---

# nd_opt_pref64

## Declaration

```occ
struct nd_opt_pref64 {
    ...
};
```

## Topics

### Instance Properties

- [nd_opt_pref64_len](kernel/nd_opt_pref64/3754135-nd_opt_pref64_len.md)
- [nd_opt_pref64_prefix](kernel/nd_opt_pref64/3754136-nd_opt_pref64_prefix.md)
- [nd_opt_pref64_scaled_lifetime_plc](kernel/nd_opt_pref64/3754137-nd_opt_pref64_scaled_lifetime_pl.md)
- [nd_opt_pref64_type](kernel/nd_opt_pref64/3754138-nd_opt_pref64_type.md)