Decommissioning of US3 site

Scheduled for Dec 8, 09:30 - 10:30 UTC

Scheduled

Dear Customer,

As a part of our continuous efforts to modernize and improve Sinch's platform performance, we are writing to inform you that we are decommissioning our US3 site.

Should you be utilizing any of the following US3 endpoints, we advise you to update these records to point to our US1 site for the respective service instead:

US3 endpoints:

us3.smpp.api.sinch.com
smpp-us3.clxcommunications.com
inbound01-ash1.clxnetworks.com
us3.httpsms.api.sinch.com
http-us3.clxcommunications.com
us3.httplookup.api.sinch.com
enum-us3.clxcommunications.com
209.95.131.8

US1 endpoints:

us1.smpp.api.sinch.com
us1.httpsms.api.sinch.com
us1.httplookup.api.sinch.com

Please take care to whitelist the following IP addresses to ensure DR&MO Flow: 54.92.160.84, 3.213.71.59, 23.22.91.120

Please contact support@sinch.com should you require further information or assistance.

Posted Sep 12, 2025 - 13:38 UTC

This scheduled maintenance affects: Messaging APIs (SMPP - US, HTTP - US) and Lookup API Endpoints (ENUM US, HTTP US).