---
title: Are there limitations to subscriber tags?
description: Tags are applied to subscribers once they text back a keyword or if they opt into specific tags at sign-up.
---

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# Are there limitations to subscriber tags?

## Tags are applied to subscribers once they text back a keyword or if they opt into specific tags at sign-up.

Let's identify what terms and characters can be used to create a working tag. 

 

Subscriber tags **can contain** any amount of: ✅

- alphanumeric characters
- multi-word tags
- spaces, hyphens, and underscores
- Special Characters and punctuation
- Emojis

Subscriber tags **cannot contain** the following: 🚫

- Protected SMS keywords (Stop, Yes, etc)
- Location keywords

### Refer to the following table for examples

 

| **Keywords** | **Classification** | **Allowed?** |
| --- | --- | --- |
| coffee, tea, weekend, san francisco 49ers, 212, under 35, 10-4 | Alphanumeric keywords | **Allowed**. Tags can be any length and consist of any combination of letters, numbers, and spaces. |
| mother-in-law, 10-4, cool\_cats, 100% , “quote” , :) , #awesome, cool\_cats | special characters | **Allowed**. Tags can contain special characters. |
| ![grinning face](https://paper.dropboxstatic.com/static/img/ace/emoji/1f600.png?version=6.0.0)[![american football](https://paper.dropboxstatic.com/static/img/ace/emoji/1f3c8.png?version=6.0.0)](https://emojipedia.org/american-football/) ![pizza](https://paper.dropboxstatic.com/static/img/ace/emoji/1f355.png?version=6.0.0) | Emojis | **Allowed**. Tags can contain emojis. |
| stop, stopall, unsubscribe, cancel, end, quit, start, yes, unstop, help, info, agree | SMS Keywords | **Not allowed**. These words are protected SMS keywords. |
| Zip Codes, Cities, States if they match Location tag formatting.  - **Postal Code** 5-digit numeric string: i.e. 73301 - **City:** City name followed by two-letter state abbreviation without any comma: i.e. Austin TX - **State** Full state name: Texas | Location tags | **Not allowed**. These tags are reserved for location based segmentation. |

 

 

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