What it is
An intranet is a private network for a company or group. Only approved members can sign in to access internal tools, documents, wikis, chat, and apps. It helps teams share information securely without exposing it to the public internet.
Why it matters
An intranet centralizes work and keeps sensitive data inside the organization. With the right access controls, people get what they need fast while outsiders stay out.
How it works - quick tour
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Identity & access: sign in with company accounts, SSO, and MFA
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Private hosting: apps live on internal servers or cloud VPCs
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Segmentation: separate zones for HR, finance, engineering
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Secure access: on-site networks or remote via VPN/zero trust
Good practices
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Enforce MFA and least-privilege permissions for every app
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Keep systems patched and remove unused services and accounts
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Use HTTPS everywhere, audit logs, and regular access reviews
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Classify content and limit sharing outside the org
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Provide clear navigation, search, and ownership so content stays fresh
Intranet, extranet, and VPN
An intranet contains internal services. An extranet exposes a limited part of those services to partners or customers. A VPN is one way to reach private resources remotely; it is not the intranet itself. Cloud-hosted applications can also be part of an intranet when access is restricted by organizational identity and policy.
Security checklist
- Inventory services, owners, data sensitivity, and every path from the public internet.
- Require multi-factor authentication and device checks for remote access.
- Apply least privilege, separate sensitive systems, and review access after role changes.
- Patch internet-facing gateways and internal applications on a defined schedule.
- Log authentication and administrative changes, protect backups, and test incident response.
A private IP address only describes routing. It does not prove that a user, device, or application is trustworthy.