When DNS entries are created for a DHCP release, when are they removed?

Is there a set period when entries created in DNS from DHCP are removed? Does it automatically get removed when the lease expires without renewal?

Find more posts tagged with

SAVE $250 on Your Boot Camp — Use Code "EXAM26"

Exclusively for TechExams members for Infosec Boot Camps starting before April 30, 2026

View Boot Camps

Comments

Claymoore

They are scavenged when the DNS record becomes stale, based on the last time it was dynamically updated. Scavenging isn't enabled by default.

Old article, but good explanation:
Scavenging Stale DNS Records

2008 info:
Understanding Aging and Scavenging

By default, the aging and scavenging mechanism for the DNS Server service is disabled. It should be enabled only when all parameters are fully understood. Otherwise, the server can be accidentally configured to delete records that should not be deleted. If a record is accidentally deleted, not only will users fail to resolve queries for that record, but any user can create a record and take ownership of it, even on zones that are configured for secure dynamic update.