The Singapore SMS Sender ID Registry (SSIR) is the mandatory register for sender IDs used to send SMS to Singapore mobile numbers. Since 31 January 2023 every organisation that sends with a sender ID must register it, through an account tied to a Singapore UEN, and send only through participating aggregators. Unregistered sender IDs are shown as "Likely-SCAM".
Rules last checked: October 2026.
What is the Singapore sender ID registry?
The SSIR is run by the Singapore Network Information Centre (SGNIC), a subsidiary of the Infocomm Media Development Authority (IMDA). It started in March 2022 as a voluntary registry and became mandatory under IMDA's full regime:
- 31 October 2022 to 30 January 2023: registration window for all organisations.
- From 31 January 2023: registration is mandatory for organisations sending SMS with sender IDs, and unregistered sender IDs are labelled "Likely-SCAM".
The goal is the same as in other registration countries: make it hard for scammers to send messages that look like they come from banks or government. Our guide to sender ID registration compares the main regimes, and Australia's newer scheme is in Australia's ACMA sender ID register.
Who can register a sender ID (SSIR registration)?
SSIR registration is open to organisations with a Singapore Unique Entity Number (UEN), on a first-come, first-served basis per sender ID. You need Corppass to log in. Foreign companies typically get a UEN through ACRA by setting up a local subsidiary or branch; the Singapore entity can then authorise overseas affiliates with a letter of authorisation. Without a UEN, you cannot register a sender ID in your own name.
| Item | Detail (as of 2026) |
|---|---|
| Operator of the registry | SGNIC, a subsidiary of IMDA |
| Eligibility | Organisations with a Singapore UEN |
| Account set-up fee | S$545 one-time per organisation (incl. GST) |
| Sender ID fee | S$218 per sender ID per year (incl. GST) |
| Unregistered sender IDs | Shown as "Likely-SCAM" |
| Scope | SMS to Singapore mobile numbers |
Why do participating aggregators matter?
A registered sender ID is only protected when the message reaches Singapore through a participating aggregator: an IMDA-licensed operator that has joined the registry. Registered sender IDs sent through non-participating aggregators are blocked. So registration is only half of the job; the other half is the route.
For international senders this is the critical question when buying a Singapore route. Ask the provider whether the final hand-off into Singapore goes through a participating aggregator, and test with your registered ID. Routes that promise any sender ID without registration are grey routes, covered in grey SMS routes and their risks. Our checklist on choosing an A2P SMS provider lists the other questions to ask.
Can numeric sender IDs be registered?
Some can. The SSIR accepts 5-digit short codes starting with 7 and 10-digit numbers with the 65 prefix in the 8 or 9 series, as long as they are unique to the organisation and issued by a Singapore mobile operator. Ordinary SIM mobile numbers cannot be registered, and SMS sent from a SIM with its own number is outside the regime. The differences between alphanumeric, short code and long number senders are in SMS sender ID types and SMS short codes.
How to send A2P SMS to Singapore
- Get or confirm your Singapore UEN, or the UEN of the local entity that will authorise you.
- Open an SSIR account with SGNIC through Corppass and register each sender ID.
- Use a route that ends at a participating aggregator and test on Singtel, StarHub, M1 and SIMBA numbers.
- Keep OTP messages short and link-free; see OTP SMS best practices.
Getting a Singapore SMS route
VoIPMatcher sources A2P SMS routes from its carriers and manages them for you. See the Singapore SMS destination page, then request a Singapore SMS route with your registered sender IDs and expected volume.
Frequently asked questions
Can a foreign company register a sender ID in Singapore?
Only organisations with a Singapore UEN can open an SSIR account. A foreign company usually gets one by setting up a local subsidiary or branch registered with ACRA. A registered Singapore entity can then authorise overseas affiliates to use its sender IDs through a letter of authorisation, as described in the SGNIC FAQ.
How much does SSIR registration cost?
SGNIC lists a one-time account set-up fee of S$545 per organisation and an annual fee of S$218 per registered sender ID, both including GST. The fees are non-refundable. Your SMS provider may add its own charges for carrying registered sender IDs, so ask for its pricing as well.
Does SSIR apply to SMS sent from a mobile number?
No. SMS sent from a SIM card with its own mobile number is outside the regime, and such numbers cannot be registered. The registry covers alphanumeric sender IDs and certain numeric IDs issued by Singapore mobile operators, such as 5-digit short codes starting with 7.
What does Likely-SCAM mean on an SMS in Singapore?
Likely-SCAM is the label Singapore networks show in place of the sender ID when a message uses an alphanumeric or numeric sender ID that is not registered with the SSIR, or is sent through an aggregator that does not participate in the registry. It warns the recipient that the sender has not been verified.
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