A1
certificate, along with PCI DSS, ISO 9001 and ISO 27001 certifications.” A1 also operates three more data centres in Zagreb, designed to support mainly internal infrastructure. One of the primary facilities, built in 2012, houses three server rooms and now operates at 90 % capacity. Another long-standing site, in operation since 1999, has historically served as a key technical hub, though most of its server rooms will be decommissioned by the end of 2025 as part of a broader infrastructure consolidation.
Beyond Zagreb, A1 maintains a network of regional data centres that provide redundancy and support for critical infrastructure. Data centres in Rijeka, Split and Osijek were originally established as regional telecommunication hubs in the early 2000s and continue to serve as essential sites for internal operations and geo-redundant backups.
“ All A1’ s data centres are built to ensure high availability and reliability, featuring redundant and robust
“ Our mission goes beyond simply providing telecommunications services – we strive to empower individuals, businesses, and communities”
BOJAN KLASAN, HEAD OF DATA CENTRE, A1 CROATIA