/29 Subnet Mask: How Many IPs?
8 addresses, 6 usable, mask 255.255.255.248.
A /29 gives 8 addresses, enough for a handful of servers or a small DMZ. It is the smallest subnet Azure and Google Cloud allow.
Subnet mask for /29
The /29 subnet mask is 255.255.255.248: 29 bits for the network and 3 for hosts.
| Subnet mask | 255.255.255.248 |
|---|---|
| Mask in binary | 11111111.11111111.11111111.11111000 |
| Wildcard mask | 0.0.0.7 |
| Total addresses | 8 |
| Usable hosts | 6 |
| In /24 terms | 32 of them fit in one /24. |
| Example (10.0.0.0/29) | 10.0.0.0 - 10.0.0.7 |
Usable addresses in cloud subnets
Cloud providers reserve extra addresses in every subnet, so fewer than 6 are available to your machines.
| AWS | not allowed (smallest is /28) |
|---|---|
| Azure | 3 usable |
| Google Cloud | 4 usable |
| Oracle Cloud | 5 usable |
Limits and reserved counts are commonly documented values; check your provider's current documentation before you plan around them.
Other sizes
/16 | /22 | /23 | /24 | /25 | /26 | /27 | /28 | /29 | /30
Split a block into /29 subnets with the subnet splitter, or calculate any block with the CIDR calculator.
FAQ
How many usable IP addresses are in a /29?
6 usable addresses out of 8. The network and broadcast addresses are reserved.
What is the subnet mask for /29?
255.255.255.248, with wildcard mask 0.0.0.7.
How many usable addresses does a /29 have in AWS?
None: AWS does not allow a subnet smaller than /28.