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128 IP addresses.
That’s the answer. A /25 subnet contains exactly 128 IP addresses. But only 126 are actually usable — the first address is the network identifier, and the last is the broadcast address.
A /25 is exactly half of a /24. It’s created by splitting a /24 in two.
The “/25” in CIDR notation means 25 bits are used for the network portion of the address. That leaves 7 bits for host addresses.
The calculation:
It’s not arbitrary. It’s binary math.
| CIDR | Subnet Mask | Total IPs | Usable IPs | Common Name |
|---|---|---|---|---|
| /25 | 255.255.255.128 | 128 | 126 | Half /24 |
| /24 | 255.255.255.0 | 256 | 254 | Standard block |
Typical /25 allocation: Small business office with ~100 devices on one VLAN, branch office with ~80 workstations + servers, or small hosting company with ~90 customer VMs.
A /25 subnet contains 128 IP addresses total, with 126 usable addresses. Two addresses are reserved: the network address (first) and broadcast address (last).
The subnet mask for /25 is 255.255.255.128. This means the first 25 bits identify the network, and the last 7 bits identify individual hosts.
A /24 can be split into exactly 2 /25 subnets. Each /25 contains 128 IP addresses (126 usable).
