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What is a domain slot and how it works?

Domain slots are the core billing unit in DMARC/eye — each monitored domain takes up one slot, and you can swap domains freely within your paid limit.

In DMARC/eye, the domain slot is the primary billing unit. It determines how many domains you can monitor and how your plan is calculated—whether you’re on a monthly or annual subscription.

What is a domain slot?

A domain slot indicates the ability to monitor a single domain within your account.

  • Each domain added to DMARC/eye occupies one slot.
  • The total number of slots determines your billing — not the number of reports or emails.
  • If you remove a domain, the slot becomes available again — and you can assign it to a new domain.

A domain slot is similar to a reserved seat: it’s yours for the billing period, regardless of who sits in it.

Can I change the domain inside a slot?

Yes. You can remove one domain and add another within the same billing period — at no extra cost — as long as you stay within your paid quota.

Example:

  • You have a Scale plan with 3 domain slots.
  • In week 1, you’re monitoring:
    • domain-a.com
    • domain-b.com
    • domain-c.com
  • Later, you remove domain-b.com and replace it with domain-d.net.
  • This is fine — you’re still using only 3 slots.

Why do we charge for slots, not “active” domains?

DMARC/eye can’t reliably and automatically determine whether a domain is active or inactive in real time. The activity depends on external DNS configuration, which can change at any time — often beyond our control or visibility.

That’s why we charge based on the slots you’ve claimed, not whether those domains are properly configured or receiving reports.

Practical tips

  • If you’re planning to rotate domains regularly (e.g., for testing), choose a plan with enough slots to cover your needs.
  • Removing a domain from your dashboard frees up a slot immediately.
  • On monthly billing, the number of slots used at the end of the billing cycle determines your next invoice.
  • On annual billing, new slots added mid-cycle are charged pro rata.

Still unsure how domain slots relate to your use case? Contact our support team — we’re happy to help you optimize your setup.