/9 Subnet
A /9 has 8,388,608 addresses, 8,388,606 of them usable by hosts. Its netmask is 255.128.0.0. Enter any address below to see its /9 network.
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Examples:
IPv4 network
8,388,606 usable hosts · 10.0.0.1 to 10.127.255.254
Details
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/9 at a glance
A /9 fixes the first 9 bits of the address as the network and leaves 23 bits for hosts, so it holds 2^23 = 8,388,608 addresses. The first is the network address and the last is the broadcast address, leaving 8,388,606 for hosts.
A /9 is 32,768 /24 networks side by side; registries and ISPs allocate blocks this size to networks that route them on the internet.
A /9 can be announced in BGP on its own: /24 is the longest prefix most networks accept.
Questions
How many usable IP addresses are in a /9?
What is the subnet mask for /9?
How many /24 networks are in a /9?
Is 255.128.0.0 the same as /9?
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