The greatest number of bits that could be borrowed from the host portion of a class B subnet mask and still have at least 130 hosts per subnet is 10 bits.
A subnet mask can be defined as a logical subdivision of an internet protocol (IP) network into a 32-bit number by setting all host bits to 0s and all network bits to 1s.
Ideally, a class B subnet mask is made up of 16 hosts bits per internet protocol (IP) network. Thus, you should determine the number of possible host in a class B subnet mask by using this formula:
Y = 2ⁿ - 2
Y = 2¹⁶ - 2
In conclusion, the greatest number of bits that could be borrowed from the host portion of a class B subnet mask with at least 130 hosts per subnet left is 10 bits.
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