/29 Subnet

A /29 has 8 addresses, 6 of them usable by hosts. Its netmask is 255.255.255.248. Enter any address below to see its /29 network.

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Examples:

IPv4 network

6 usable hosts · 192.168.1.1 to 192.168.1.6

Private (RFC 1918)

Details

Netmask
Wildcard Mask
Broadcast
First Usable
Last Usable
Usable Hosts
Total Addresses
Netmask in Binary

Split Into Subnets

192.168.1.0/30192.168.1.0 – 192.168.1.3
192.168.1.4/30192.168.1.4 – 192.168.1.7

Subnet Calculator

/29 at a glance

CIDR Prefix/29
Netmask255.255.255.248
Wildcard Mask0.0.0.7
Netmask (Hex)0xFFFFFFF8
Total Addresses8
Usable Hosts6
Host Bits3
Fit in a /2432
Binary Mask11111111.11111111.11111111.11111000

A /29 fixes the first 29 bits of the address as the network and leaves 3 bits for hosts, so it holds 2^3 = 8 addresses. The first is the network address and the last is the broadcast address, leaving 6 for hosts.

Eight addresses, six usable, and in practice five once the gateway takes one. The usual small business static IP block.

Most networks filter BGP announcements longer than /24, so a block this size cannot be routed on the internet on its own; it is carved out of a larger block by your provider.

Questions

How many usable IP addresses are in a /29?
6. A /29 has 8 addresses; the network and broadcast addresses are not usable by hosts.
What is the subnet mask for /29?
255.255.255.248. The wildcard (inverse) mask, used in Cisco ACLs, is 0.0.0.7.
How many /29 subnets fit in a /24?
32, each with 8 addresses.
Is 255.255.255.248 the same as /29?
Yes. 255.255.255.248 written in binary is 29 ones followed by 3 zeros, which is what /29 means.

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