---
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headline: "21235: IP Access Control List Validation Error"
url: https://www.twilio.com/docs/api/errors/21235
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
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  name: Twilio Developer Education Team
publisher:
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  name: Twilio
---

# 21235: IP Access Control List Validation Error

Log Type: APPLICATION

Log Level: ERROR

## Description

One of the parameters passed when creating or updating an IP Access Control List was incorrect.

### Possible causes

* An IP Access Control List or IP Address with the same FriendlyName may already exist.
* The IP Access Control List may already contain that IP Address

### Possible solutions

* Use a different FriendlyName
* Make sure the IP Access Control List does not already contain that IP Address.