---
title: "Does the list of DHCP parameters need to be in hex?"
slug: "aa-00334"
description: "Yes."
tags: ["isc dhcp"]
updated: 2018-10-25T18:33:50Z
published: 2018-10-25T18:33:50Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Does the list of parameters in the dhcp-parameter-request-list need to be in hex?

Yes; if you're using the concat() syntax, the additional option numbers are represented in hex.

This is because of the way that `dhcpd.conf` is parsed. As an example: 17,18 would get options 23 (default-ip-ttl) and 24 (path-mtu-aging-timeout).