A /29 subnet mask is a prefix length that divides a larger network into multiple smaller subnetworks. Each of the subnetworks will have a maximum of 8 IP address ranges. The first IP address in this range is used as the network address, while the last IP address in this range is used as the broadcast address. Hence, there are 6 usable IP addresses in a /29 subnet mask.
For example, if we subnet the network 192.168.2.0/24 with a /29 subnet mask, the first subnet will have the network address 192.168.2.0, a usable IP range from 192.168.2.1 to 192.168.2.6, and the broadcast address of 192.168.2.7. The second subnet will have a network address of 192.168.2.8, a usable IP range of 192.168.2.9 to 192.168.2.14, a broadcast address of 192.168.2.15, and so on.
Here is a table of a network subnetted with a /29 prefix length.
| Network Address | Usable IP address range | Broadcast address |
|---|---|---|
| .0 | .1-.6 | .7 |
| .8 | .9-.14 | .15 |
| .16 | .17-.22 | .23 |
| .24 | .25-.30 | .31 |
| .32 | .33-.38 | .39 |
| .40 | .41-.46 | .47 |
| .48 | .49-.54 | .55 |
| .56 | .57-.62 | .63 |
| .64 | .65-.70 | .71 |
| .72 | .73-.78 | .79 |
| .80 | .81-.86 | .87 |
| .88 | .89-.94 | .95 |
| .96 | .97-.102 | .103 |
| .104 | .105-.110 | .111 |
| .112 | .113-.118 | .119 |
| .120 | .121-.126 | .127 |
| .128 | .129-.134 | .135 |
| .136 | .137-.142 | .143 |
| .144 | .145-.150 | .151 |
| .152 | .153-.158 | .159 |
| .160 | .161-.166 | .167 |
| .168 | .169-.174 | .175 |
| .176 | .177-.182 | .183 |
| .184 | .185-.190 | .191 |
| .192 | .193-.198 | .199 |
| .200 | .201-.206 | .207 |
| .208 | .209-.214 | .215 |
| .216 | .217-.222 | .223 |
| .224 | .225-.230 | .231 |
| .232 | .233-.238 | .239 |
| .240 | .241-.246 | .247 |
| .248 | .249-.254 | .255 |
/29 Subnet Mask Usable IP Address
In the /29 subnet mask, there are 8 ranges of IP addresses; the first one in the range is the network address, and the last IP address in this range is the broadcast IP address. Hence, there are 6 usable IP addresses in the /29 subnet mask.
/29 Subnet Mask Dotted Decimal Notation
The dotted decimal notation for a /29 subnet mask is 255.255.255.248. This representation is gotten by setting the first 29 bits of the 32-bit IPv4 address to ‘1s’, setting the remaining 3 bits to ‘0s’, and converting from binary to decimals.
/29 Wildcard Mask
The wildcard mask for /29 prefix length is 0.0.0.7. This is gotten by subtracting each octet of the subnet mask from 255.
Subnetting Class C Network with /29 Subnet Mask
To subnet a Class C network with a /29 prefix length, 5 bits are borrowed from the host bits and added to the network bits, leaving 3 bits for the host bits.
Therefore, the number of subnetworks obtainable when we subnet a class C network with a /29 prefix length is obtained as follows:
2^5 = 32
Therefore, subnetting a class network with a /29 prefix length will yield a total of 32 subnetworks, with each subnetwork having 8 range of IP addresses.
Subnetting Class B Network with /29 Subnet Mask
To subnet a Class B network with a /29 prefix length, 13 bits need to be borrowed from the host bits and added to the network bits, leaving 3 host bits.
Hence, the number of subnets obtainable when we subnet a class B network with a /29 prefix length is obtained as follows:
2^13 = 8192
Therefore, a /29 prefix length will divide a class B network into 8192 subnetworks, with each subnetwork having 8 ranges of IP addresses.
Subnetting Class A Network with /29 Subnet Mask
To subnet a Class A network with /29 prefix length, 21 bits is borrowed from the host bits and added to the network bits.
So, the number of subnetworks obtainable when we subnet a Class A network with a /29 subnet mask is given by:
2^21 = 2097152
Therefore, a /29 subnet mask will divide a Class A network into 2097152 subnetworks, with each subnetwork having 8 ranges of IP addresses.
How Many host in /29
There are a total of 8 ranges of IP addresses in a /29 subnet mask. The first IP address in this range is the network address, and the last IP address in this range is the broadcast IP address. Therefore, there are 6 free IP addresses that can be assigned to a host in a /29 subnet mask.
How Many Subnets in /29
The number of subnetworks obtainable when we subnet with a /29 subnet mask depends on the class of the network. The class C network will yield 32 subnetworks, the class B network will yield 8,192 subnetworks, and the class A network will yield 2,097,152 subnetworks when subnetted with the /29 prefix length.
Conclusion
The /29 subnet mask generally provides 8 IP address ranges per subnetwork. The first IP address in this range is reserved as the network address, and the last IP address in this range is reserved as the broadcast IP address. So, there are six usable IP addresses available to host devices.
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