Network · AZ-700 / AZ-305
Azure IPv4 subnet capacity lab
Validate prefix, total addresses, five Azure-reserved addresses, and usable addresses; Azure IPv4 only.
Run the local exercise
Key results
| Metric | Value | Unit |
|---|---|---|
| Network | 10.0.0.0/24 | |
| Total IPv4 addresses | 256 | addresses |
| Azure-reserved IPv4 addresses | 5 | addresses |
| Usable IPv4 addresses | 251 | addresses |
- Azure reserves five IPv4 addresses per subnet; service-specific subnet requirements may be stricter. IPv6 is excluded.
Experiment steps
- Choose an exact integer prefix from /16 through /29.
- Run and compare total, Azure-reserved, and usable addresses.
- Check service documentation because some services require larger subnets than the general rule.
Sources, formula, and limitations
Azure IPv4 subnet general rule: total addresses = 2^(32-prefix), and Azure reserves five addresses per subnet; this exercise limits prefixes to /16 through /29.
The network label is always 10.0.0.0/prefix; IPv6 and service-specific minimum subnet sizes are outside the formula.
Runs no network command; does not cover IPv6, routing, NSGs, or service delegation limits.