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Data type


Default value


0x0–0xFFFFFFFE ( seconds ) | 0xFFFFFFFF

0x258 ( 600 seconds = 10 minutes )


Determines how long referenced entries must remain in the Address Resolution Protocol (ARP) cache table before they can be deleted.

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



0x0–0xFFFFFFFE seconds

Specifies the minimum lifetime of unreferenced ARP cache entries.


No minimum lifetime is enforced.

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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