If an IP address is assigned to a computer dynamically, with DHCP for example, it is not guaranteed that the same IP address as before is assigned when you restart the computer. Therefore, the mapping of an IP address and a host name may differ from that in an address book file saved before.

References

• Displaying Host Names instead of IP Addresses
• Using Host Names to Identify Hosts
• Using Addresses to Identify Hosts
• Displaying Host Names instead of IP Addresses (Decoding)
• Displaying Newly Found Host Names
• Managing Addresses and Host Names
• Choosing the Host Name Used to Identify the Host
• Selecting Host Name to Be Displayed Using Address Book
• Searching Host Names
• Searching for Host Names with the IP Address Book