SMS Short Code

An SMS short code is a 5 to 6-digit phone number used to send and receive SMS or MMS messages. These codes are designed for high-volume, high-speed messaging and are most commonly used for:

• SMS marketing campaigns

• Two-factor authentication (2FA)

• SMS alerts 

• Customer service messages

• Emergency SMS notifications  

Users can interact with short codes by texting keywords (e.g., “HELP” or “STOP”) for immediate automated SMS responses.

What an SMS Short Code Provides

• High Throughput: Send thousands of messages per second, ideal for peak-volume periods like flash sales, vote tallies, or emergency broadcasts.

• Brand Recognition: Short codes are easier to remember than full-length numbers and can help build brand trust over time.

• SMS Keyword Engagement: Enable users to respond with intuitive, memorable commands like “JOIN” or “INFO,” enhancing automation and interactivity.

Why SMS Short Codes Matter

Time-Critical Messaging 
When seconds matter, like sending OTPs, emergency notifications, or limited-time offers, short codes deliver at speed.

Engagement and Compliance 
Short codes typically require carrier vetting and opt-in processes, helping maintain compliance with regulations while boosting user engagement.

Broad Use Cases 
From political SMS marketing campaigns to bank alerts, retail promotions, and public health messages, short codes are trusted for important communications.

SMS Short Codes in Australia

10DLC vs Short Code 
10DLC numbers (10-digit long codes) are restricted to lower throughput and require campaign registration via The Campaign Registry. 
Short codes offer superior speed and higher deliverability, especially for marketing and security use cases. 
Short codes must also be registered and approved, but they support larger-scale outreach and interactive campaigns with keyword functionality.

SMS Throughput 
10DLC can send around 15–60 messages per second, depending on carrier and vetting score. 
Short codes can send hundreds to thousands per second, making them ideal for nationwide campaigns.