IP Addressing¶
Azure uses a flexible IP addressing scheme for both private and public communications. Public IPs enable external access, while private IPs handle internal resource connectivity.
| IP Type | Allocation | Lifecycle | Use Case |
|---|---|---|---|
| Private Dynamic | DHCP from subnet. | May change after stop/deallocate; released only when NIC deleted. | General compute. |
| Private Static | User-defined from subnet. | Persists until deleted. | Domain controllers, DNS servers. |
| Public Dynamic | Assigned from Azure pool. | Changes if deallocated/reassigned. | Legacy scenarios only. |
| Public Static | Fixed from Azure pool. | Persists across restarts. | VPN gateways, Firewalls. |
mermaid graph TD A[New IP Request] --> B{IP Type?} B -->|Public| C[Standard SKU] B -->|Private| D[Assigned via DHCP] C --> E[Static allocation] E --> G["Resource (NIC/LB)"] D --> G
Note
Basic SKU public IPs were retired on 30 Sep 2025. Use Standard SKU for all deployments. Dynamic public IP behavior is tied to deallocation/reassignment events, not a simple reboot.