Is UTM a default property that mixpanel auto track?

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Yes, UTM parameters are default properties that Mixpanel automatically tracks. When using the Mixpanel JavaScript SDK, UTM tags present in the URL (such as utm_source, utm_medium, utm_campaign, utm_term, utm_content, and others) are automatically added to events fired from that page load. These UTM parameters are also persisted across events as Super Properties by default, and the initial UTM parameters are stored as user profile properties when seen for the first time. This enables you to segment and analyze user actions by campaign information without any manual instrumentation required for UTM tracking Track UTM Tags | Web Attribution.

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