# Your Account Panel: Client ID and Usage

## Why this matters

The account panel, at the bottom-left of the menu, is where you find your **Client ID** (account number) and a quick view of your **usage**: how many contacts you have and how many emails you've sent against your plan's limits.

## Opening your account panel

<Stepper>

1. Click the **logo / account button** at the bottom-left of the left menu (it shows the logo and your account name).

2. The account panel opens, showing your account number and your usage.

</Stepper>

![Account panel showing where to find your Client ID, with usage bars for subscribers, emails sent, and billing cycle](/images/account-settings/finding-your-client-id.png)

## Your Client ID (account number)

Your **Client ID**, also called your **account number**, is the number shown next to **Account** (for example, `1439790`). It uniquely identifies your account.

You need it mainly when you set up the DNS records that [authenticate your domain](/en/docs/senders/authenticating-domains): it appears as the `c` prefix, for example the DKIM name `c<ClientID>._domainkey.yourdomain.com` and the tracking and bounce value `c<ClientID>.md02.com`. When you copy the records from **Settings ▸ Domains**, your Client ID is already filled in. If you follow instructions that show `[CID]` as a placeholder, replace it with your Client ID. Our Support team may also ask for it.

<Callout type="tip" title="Keep it handy for support">
When you reach out to our Support team, include your **Client ID** with your request. It helps us find your account right away and get you an answer faster.
</Callout>

## Checking your usage

The same panel shows your usage for the current **Billing Cycle**, each with a bar showing how much of your plan's limit you've used:

- **Subscribers** - your total number of contacts.
- **Email Sent** - the number of emails you've sent in the current billing cycle.
- **Email API Submissions** - emails submitted through the Email API.
- **Billing Cycle** - the date range the figures above apply to.

<Callout type="info" title="Deleting contacts and your Subscribers count">
When you delete contacts, your **Subscribers** count isn't reduced right away. It's updated at the start of your **next billing period**.
</Callout>

The number of contacts and emails included depends on your plan. For what each plan includes, see the pricing page.

## Related articles

- [Authenticating your domain](/en/docs/senders/authenticating-domains) - Where your Client ID is used
- [Adding DNS records at your hosting provider](/en/docs/senders/adding-dns-records) - How and where to add the records
- [Exporting your data](/en/docs/account-settings/exports) - Download your contacts and reports