/25 Subnet
A /25 has 128 addresses, 126 of them usable by hosts. Its netmask is 255.255.255.128. Enter any address below to see its /25 network.
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Examples:
IPv4 network
126 usable hosts · 192.168.1.1 to 192.168.1.126
Details
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/25 at a glance
A /25 fixes the first 25 bits of the address as the network and leaves 7 bits for hosts, so it holds 2^7 = 128 addresses. The first is the network address and the last is the broadcast address, leaving 126 for hosts.
Half a /24. Too small to announce on the internet by itself, so it is used inside a provider's network, such as a block for a rack.
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 /25?
What is the subnet mask for /25?
How many /25 subnets fit in a /24?
Is 255.255.255.128 the same as /25?
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