Data type


Default value


0x0–0xFFFFFFFF ( seconds )

0x78 ( 120 seconds = 2 minutes )


Determines how long an unreferenced entry can remain in the Address Resolution Protocol (ARP) cache table. Entries cannot remain in the table longer than specified by the value of this entry. However, entries can be removed sooner if the table space they occupy is needed to store a new entry.

By default, this entry applies to unreferenced entries, and the ArpCacheMinReferencedLife entry applies to referenced entries, which defaults to a duration of 10 minutes. However, referenced entries must remain in the table at least as long as unreferenced entries. Therefore, if the value of this entry is greater than or equal to the value of the ArpCacheMinReferencedLife entry, the ArpCacheMinReferencedLife entry is ignored, and the ArpCacheLife entry applies to both referenced and unreferenced entries.

Note Image Note

This value does not affect ARP cache table entries that are added manually. TCP/IP does not remove manual entries.

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

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