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It is unconventional but valid subnet,3 bits will be set so now 2^3 =8 subnets and (2^5 )-2 =30 hosts per sunetswill be absolutely correct
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RFC 950 defines the use of a subnet mask (also referred to as an address mask) as a 32-bit value that is used to distinguish the network ID from the host ID in an arbitrary IP address. The bits of the subnet mask are defined as follows:

  • All bits that correspond to the network ID are set to 1.

  • All bits that correspond to the host ID are set to 0.

Each host on a TCP/IP network requires a subnet mask even on a single segment network. Either a default subnet mask, which is used when using class-based network IDs, or a custom subnet mask, which is used when subnetting or supernetting, is configured on each TCP/IP node.

Now come to question we have totally 8+8+8+3 ( 110100 ). i.e 27 1's we have. 

now no. of zero =32-27=5 

so total no. of ip address possible in this subnet = 25 

total no. of host = 32-2=30

=>>>>> read this

https://tools.ietf.org/html/rfc950#page-15

but for ipv6 this is not used and rfc made it as  a rule

https://superuser.com/questions/979915/are-subnets-always-contiguous-1s

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