/29 Subnet: Mask 255.255.255.248, 6 Usable Hosts
A /29 subnet has a subnet mask of 255.255.255.248 and contains 8 total IP addresses, of which 6 are usable host addresses (the network and broadcast addresses are reserved). 32 /29 networks fit inside a single /24.
| CIDR notation | /29 |
|---|---|
| Subnet mask | 255.255.255.248 |
| Wildcard mask | 0.0.0.7 |
| Mask in binary | 11111111.11111111.11111111.11111000 |
| Total addresses | 8 (2^3) |
| Usable hosts | 6 |
| Host bits | 3 |
Usable hosts in a /29 by platform
Cloud providers reserve more than the usual two addresses per subnet, so the same /29 gives you fewer usable IPs in the cloud than on a standard LAN.
| Platform | Reserved IPs | Usable hosts |
|---|---|---|
| Standard (network + broadcast) | 2 | 6 |
| AWS VPC | 5 | 3 |
| Microsoft Azure VNet | 5 | 3 |
| Google Cloud VPC | 4 | 4 |
| Oracle Cloud VCN | 3 | 5 |
Good to know
A /29 (6 usable hosts) is the smallest block most ISPs hand out for a business connection that needs a few static IPs.
How a /29 is calculated
- The /29 means the first 29 bits are the network portion, leaving 3 host bits.
- Total addresses = 2^(32 - 29) = 2^3 = 8.
- Usable hosts (standard) = 8 - 2 (network + broadcast) = 6.
- Subnet mask = 255.255.255.248; wildcard mask = 0.0.0.7.
Want to split a /29 into smaller subnets, see every address range, or plan a VLSM layout? Open the free subnet calculator →