Final answer:
To determine the host address of an IPv4 address, you would need to know the IPv4 address and its subnet mask. By comparing the two, you can identify the parts of the IPv4 address that represent the network and host, with the host address being the portion with bits set to '0' in the subnet mask.
Step-by-step explanation:
To determine the host address for an IPv4 address, you need to know both the IPv4 address itself and the subnet mask. The subnet mask determines how the IPv4 address is split into the network and host portions. In an IPv4 address, the network part is identified by bits set to '1' in the subnet mask, while the host part is signified by bits set to '0'.
For example, if you have an IPv4 address of 192.168.1.10 and a subnet mask of 255.255.255.0, the host address is .10. This is because the subnet mask of 255.255.255.0 indicates that the first three octets (192.168.1) are the network part of the address, and the last octet (.10) represents the host part of the address.
Therefore, to find the host address, you compare the IPv4 address with its subnet mask. Bits that are '0' in the subnet mask allow you to identify the corresponding bits in the IPv4 address as the host address.