Cloud Services. Data Centers. Co-Location Services

 United Information Highway Co. Ltd.
United Information Highway (UIH) provides Digital Infrastructure and Solutions with Terabit-per-second network on fiber optics, covering all business areas in Thailand. Cloud services, world-standard data center, cyber security.
https://www.uih.co.th/
 Internet Thailand Public Co. Ltd.
Internet Thailand (INET) operates 3 data centers in Bangkok and in Saraburi province. INET Cloud supports all business sizes, from SMEs to big enterprises. Smart Office file sharing, etc.
https://www.inet.co.th/
 Proen Corp Public Co. Ltd.
Proen Corp is a provider of Internet Service, an Internet Data Center, ICT Solutions, and Business Telecom. Cloud services, co-location services, firewalls, cloud-based DDoS protection, etc.
https://www.proen.co.th/
 Symphony Communication Public Co. Ltd.
Symphony Communication is a Telecommunication network and service provider in Thailand. It provides high speed and reliable network for both domestic and international connectivity and value-added services in Thailand and ASEAN. Cloud service.
https://www.symphony.net.th/
 Iris Cloud
IRIS stands for Intelligent Resilient Information System. The name is also inspired by a namesake Greek goddess. We strive to deliver Cloud Services that are accessible, understandable, easy and comfortable to use for everyone. Provided by CAT Telecom Public Co. Ltd.
https://www.iris.cloud/
 True Internet Corporation Co. Ltd.
True Internet Corporation provides Internet solutions of enterprises and SMEs. Cloud services, co-location services, DDos protection, SSL VPN, web hosting.
https://www.trueinternet.co.th/
 T.C.C. Technology (TCCT)
T.C.C. Technology (TCCT) is Thailand's leading commercial data center service provider managed under the umbrella of the Berli Jucker Group and Thai Charoen Corporation Group. TCCT has two world-class data centers located at Empire Tower Data Center on Sathorn Road and along the Bangna-Trad. Core services offered include : Server Colocation Services, Managed Support Services, Disaster Recovery Center (DRC) Services.
http://www.tcc-technology.com/
 TOT Public Co. Ltd.
TOT offers internet connection services (ADSL, fiber, Wifi hotspots). TOT Internet Data Center, and Cloud services. Fixed line and mobile phone services. (mostly Thai language info)
https://www.tot.co.th/
 OSD - Optimum Solution Defines
OSD offers network solutions including IT outsourcing, cloud services, data security services, call center systems, telephone billing systems and more.
https://www.osd.co.th/
 KSC Commercial Internet Co. Ltd.
KSC was the first commercial Internet service provider (ISP) in Thailand. It now is a full-range Internet and business solutions provider. Corporate Ethernet and leased line provider. Biz co-location, cloud services. Web hosting, SSL certificates, domain name registrations.
https://www.ksc.net/