Subnet Mask
/29 Subnet Mask
A /29 prefix means the subnet mask is 255.255.255.248. It has 3 host bits, giving 8 total addresses and 6 usable hosts.
/29 at a glance
| Property | Value |
|---|---|
| CIDR prefix | /29 |
| Subnet mask | 255.255.255.248 |
| Wildcard mask | 0.0.0.7 |
| Total addresses | 8 |
| Usable hosts | 6 |
| Host bits | 3 |
How it is calculated
A /29 sets the first 29 bits to 1 (network) and the remaining 3 bits to 0 (host). Usable hosts = 23 − 2 = 6.
The wildcard mask 0.0.0.7 is the inverse — used in Cisco ACLs and OSPF network statements.
Frequently asked questions
What is a /29 subnet mask?
A /29 equals 255.255.255.248 in dotted decimal (wildcard 0.0.0.7). It provides 8 total addresses and 6 usable hosts.
How many hosts are in a /29?
A /29 has 3 host bits, so it supports 6 usable hosts.
What is the wildcard mask for /29?
The wildcard (inverse) mask for /29 is 0.0.0.7, used in Cisco ACLs and OSPF statements.
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