A /29 subnet mask is 255.255.255.248, with 8 addresses and 6 usable hosts.
| CIDR prefix | /29 |
|---|---|
| Subnet mask | 255.255.255.248 |
| Subnet mask (binary) | 11111111.11111111.11111111.11111000 |
| Wildcard mask | 0.0.0.7 |
| Network bits / host bits | 29 / 3 |
| Total addresses | 8 |
| Usable hosts | 6 |
| /29 subnets in a /8 | 2,097,152 |
| /29 subnets in a /16 | 8,192 |
| /29 subnets in a /24 | 32 |
The mask ends 5 bits into octet 4, so blocks step in increments of 8 in that octet. Six usable hosts, a typical size for a small DMZ, a firewall cluster or an ISP customer hand-off.
| Network | First usable host | Last usable host | Broadcast |
|---|---|---|---|
| 192.168.1.0/29 | 192.168.1.1 | 192.168.1.6 | 192.168.1.7 |
| 192.168.1.8/29 | 192.168.1.9 | 192.168.1.14 | 192.168.1.15 |
| 192.168.1.16/29 | 192.168.1.17 | 192.168.1.22 | 192.168.1.23 |
| 192.168.1.24/29 | 192.168.1.25 | 192.168.1.30 | 192.168.1.31 |
| 192.168.1.32/29 | 192.168.1.33 | 192.168.1.38 | 192.168.1.39 |
| 192.168.1.40/29 | 192.168.1.41 | 192.168.1.46 | 192.168.1.47 |
| 192.168.1.48/29 | 192.168.1.49 | 192.168.1.54 | 192.168.1.55 |
| 192.168.1.56/29 | 192.168.1.57 | 192.168.1.62 | 192.168.1.63 |
A /29 subnet mask is 255.255.255.248. In binary that is 11111111.11111111.11111111.11111000: 29 network bits followed by 3 host bits. The wildcard mask is 0.0.0.7.
A /29 holds 8 addresses in total. Subtracting the network and broadcast addresses leaves 6 usable hosts.
A /24 divides into 32 subnets of size /29, because each extra mask bit doubles the number of subnets.
Calculate this over HTTP: curl https://networkcalc.com/api/ip/192.168.1.0/29.
See the Subnet Calculator API.