---
title: tcpi_l4s_enabled
framework: Kernel
role: symbol
role_heading: Instance Property
platforms: [macOS 15.4+]
path: kernel/tcp_info/4536555-tcpi_l4s_enabled
---

# tcpi_l4s_enabled

## Declaration

```occ
u_int16_t tcpi_l4s_enabled:1;
```