ISM-1439 · September 2026
Using content delivery networks
Guidelines for networking / Service continuity for online services / Using content delivery networks
Official control wording
If using CDNs, disclosing the IP addresses of web servers under an organisation’s control (referred to as origin servers) is avoided and access to the origin servers is restricted to the CDNs and authorised management networks.
Applicability
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Implementation guidance
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Official source
ASD’s ISM OSCAL v2026.09.4 · Original catalogue JSON · Pinned checksums and edition details
Control source identifier: ism-1439. Check the official release before relying on this snapshot for an assessment.
Official control wording and applicability: Australian Signals Directorate, © Commonwealth of Australia 2026. September 2026 ISM, OSCAL v2026.09.4, reproduced under CC BY 4.0. Formatting is adapted for this website.
Latticework Systems’ implementation guidance is our interpretation. Provenance and scope.