Subnet Mask Calculator

Number of hosts required:

120

Subnet Mask:

255.255.255.128

11111111.11111111.11111111.10000000

Subnet Mask (Prefix):

/25

Number of host bits:

Number of usable hosts or IPs provided by /25:

126 (2⁷ - 2)

Link:

https://www.calcip.com/subnet-mask-calculator/120

* Concepts of IP addressing, subnetting, VLSM (Variable Length Subnet Mask), route summarization, IPv6, EUI-64 (Extended Unique Identifier-64) and relevant exam tips, are covered in our CCNA (Cisco Certified Network Associate) course .