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Action may be required - SMS API firewall update (api.sms.optus.com.au) Dec 3, 2026 12:00-12:01 AEST
We are improving the resilience of the Optus SMS API to enable faster, automatic failover during service disruptions. For this to work, some customers will need to make a small firewall change by 3 December 2026.
Does this affect you?
* If your organisation’s firewall only allows connections to specific IP addresses, you’ll need to add two new addresses to your allowlist (see below). Please forward this email to whoever manages your network or firewall.
* If you don’t restrict connections by IP address, no action is needed.
What to do
Make sure your firewall allows outbound connections to all three of these addresses:
1. 54.66.199.3 - Existing – keep this
2. 52.65.154.116 - New – please add
3. 54.66.172.54 - New – please add
Why this matters: The two new addresses are backups. If a disruption occurs, api.sms.optus.com.au will automatically switch to them. If they’re blocked by your firewall, your SMS API connections may fail during that disruption.
What isn’t changing: Keep connecting to api.sms.optus.com.au as you do today. Your API credentials, integration and code don’t need to change. If you’ve hard-coded an IP address instead of the hostname, please switch to the hostname.
Questions? Contact optussd@modicagroup.com
Posted on Nov 04, 2026 - 15:35 AEST
Does this affect you?
* If your organisation’s firewall only allows connections to specific IP addresses, you’ll need to add two new addresses to your allowlist (see below). Please forward this email to whoever manages your network or firewall.
* If you don’t restrict connections by IP address, no action is needed.
What to do
Make sure your firewall allows outbound connections to all three of these addresses:
1. 54.66.199.3 - Existing – keep this
2. 52.65.154.116 - New – please add
3. 54.66.172.54 - New – please add
Why this matters: The two new addresses are backups. If a disruption occurs, api.sms.optus.com.au will automatically switch to them. If they’re blocked by your firewall, your SMS API connections may fail during that disruption.
What isn’t changing: Keep connecting to api.sms.optus.com.au as you do today. Your API credentials, integration and code don’t need to change. If you’ve hard-coded an IP address instead of the hostname, please switch to the hostname.
Questions? Contact optussd@modicagroup.com
Posted on Nov 04, 2026 - 15:35 AEST
Upcoming SSL certificate change for Optus SMS Suite (February 2027) Feb 23, 2027 05:00-06:00 AEST
On Tuesday 23 February 2027 at 4:00 am AEDT, the SSL certificates for Optus SMS Suite (*.sms.optus.com.au and sms.optus.com.au) will change to certificates issued by Amazon Trust Services through AWS Certificate Manager. We'll post a final confirmation here in early February.
Do I need to do anything?
If your systems use the standard trust store provided by your operating system, runtime or browser, no action is needed. Amazon Trust Services certificates are already trusted there.
If you manage your own trust store, or your integration only accepts specific certificates (known as certificate pinning), you need to act before the change. Add the Amazon Trust Services root certificates listed at https://sms.optus.com.au/docs/en/integrations/api-documentation/ssl-certificates/ now, and keep your existing entries in place until the change is complete.
Which services are affected? The Optus SMS Suite web portal, REST API, SMPP and Email2SMS.
Why is this changing? Industry rules are steadily shortening certificate lifetimes to 100 days from March 2027 and 47 days from March 2029, and certificate chains now change routinely across all providers. Moving to automatically renewed certificates keeps the service secure without customers needing to act at every renewal.
We recommend trusting root certificates rather than individual leaf or intermediate certificates. From this change onward, we won't publish leaf or intermediate certificates, because they will change regularly.
SMPP connections will need to reconnect during the change; otherwise, we don't expect any interruption to service.
If you have questions, contact optussd@modicagroup.com.
Posted on Nov 09, 2026 - 12:54 AEST
Do I need to do anything?
If your systems use the standard trust store provided by your operating system, runtime or browser, no action is needed. Amazon Trust Services certificates are already trusted there.
If you manage your own trust store, or your integration only accepts specific certificates (known as certificate pinning), you need to act before the change. Add the Amazon Trust Services root certificates listed at https://sms.optus.com.au/docs/en/integrations/api-documentation/ssl-certificates/ now, and keep your existing entries in place until the change is complete.
Which services are affected? The Optus SMS Suite web portal, REST API, SMPP and Email2SMS.
Why is this changing? Industry rules are steadily shortening certificate lifetimes to 100 days from March 2027 and 47 days from March 2029, and certificate chains now change routinely across all providers. Moving to automatically renewed certificates keeps the service secure without customers needing to act at every renewal.
We recommend trusting root certificates rather than individual leaf or intermediate certificates. From this change onward, we won't publish leaf or intermediate certificates, because they will change regularly.
SMPP connections will need to reconnect during the change; otherwise, we don't expect any interruption to service.
If you have questions, contact optussd@modicagroup.com.
Posted on Nov 09, 2026 - 12:54 AEST
