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first seen

the recorded date and time when a specified entity, event, or activity was first observed.

In plain English

It points to the moment something was first noticed and entered into the record. The "something" can be a specific entity, event, or activity, and the value is the date and time of that initial observation.

In context

Here, it indicates the date and time when that device or access source was first observed and recorded.

Situation
Checking sessions, devices, login history, and unusual access activity
What it communicates
labels when a device or access source was first recorded

Meaning limits

By itself, this term does not show whether anything changed after that first recorded observation.

Examples

“The report gives the smoke plume's first seen as 03:14, although it remained visible for hours.”

Core meaning

“Use the tablet's first seen to place it in the morning timeline.”

In context