/10 Subnet

A /10 has 4,194,304 addresses, 4,194,302 of them usable by hosts. Its netmask is 255.192.0.0. Enter any address below to see its /10 network.

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Examples:

IPv4 network

4,194,302 usable hosts · 10.0.0.1 to 10.63.255.254

Private (RFC 1918)

Details

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

Split Into Subnets

10.0.0.0/1110.0.0.0 – 10.31.255.255
10.32.0.0/1110.32.0.0 – 10.63.255.255

Subnet Calculator

/10 at a glance

CIDR Prefix/10
Netmask255.192.0.0
Wildcard Mask0.63.255.255
Netmask (Hex)0xFFC00000
Total Addresses4,194,304
Usable Hosts4,194,302
Host Bits22
Contains /24s16,384
Binary Mask11111111.11000000.00000000.00000000

A /10 fixes the first 10 bits of the address as the network and leaves 22 bits for hosts, so it holds 2^22 = 4,194,304 addresses. The first is the network address and the last is the broadcast address, leaving 4,194,302 for hosts.

A /10 is 16,384 /24 networks side by side; registries and ISPs allocate blocks this size to networks that route them on the internet.

A /10 can be announced in BGP on its own: /24 is the longest prefix most networks accept.

Other IPv4 Prefixes

/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32

IPv6 Prefixes

IPv6 /32IPv6 /36IPv6 /40IPv6 /44IPv6 /48IPv6 /52IPv6 /56IPv6 /60IPv6 /64IPv6 /112IPv6 /126IPv6 /127IPv6 /128

Questions

How many usable IP addresses are in a /10?
4,194,302. A /10 has 4,194,304 addresses; the network and broadcast addresses are not usable by hosts.
What is the subnet mask for /10?
255.192.0.0. The wildcard (inverse) mask, used in Cisco ACLs, is 0.63.255.255.
How many /24 networks are in a /10?
16,384. Each step from /10 to /24 doubles the number of networks.
Is 255.192.0.0 the same as /10?
Yes. 255.192.0.0 written in binary is 10 ones followed by 22 zeros, which is what /10 means.

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