---
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"@id": https://www.twilio.com/docs/api/errors/21237#article
headline: "21237: Maximum IP Addresses Reached for List"
url: https://www.twilio.com/docs/api/errors/21237
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
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  name: Twilio Developer Education Team
publisher:
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  name: Twilio
---

# 21237: Maximum IP Addresses Reached for List

Log Type: APPLICATION

Log Level: ERROR

## Description

IP Access control lists cannot contain more than 25 Addresses.

### Possible causes

* IP Access control lists cannot contain more than 25 Addresses.

### Possible solutions

* Remove IP Addresses from your IP Access Control List if you must create new ones.