---
title: tls.client.tlsexts_list
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/tls-client-tlsexts-list
---

**Type:** STRING  
**Access:** read-only

**Available in:** recv, hash, deliver, log

The list of TLS extensions supported by the client, as little-endian, 16-bit 
unsigned integers, hex encoded.