Quotas & Limits¶
Core Concepts
NOB.center enforces per-organization quotas on the number of resources you can create. Quotas are set by your subscription tier and can be viewed at any time in your account settings.
What is counted¶
Quotas apply to enabled resources. Disabling a resource frees up a slot so you can create a new one — but you can only keep up to the same limit in a disabled state at any time. This prevents unlimited accumulation of parked resources.
The table below lists every quota type in the system:
| Module | Resource | Counted as |
|---|---|---|
| CT Log | Filters | Active (non-deleted) filters |
| CT Log | Alert rules | Enabled rules |
| CT Log | Alert templates | Enabled templates |
| DNS | Domains | Enabled domain monitors |
| DNS | DNS records | Enabled records across all domains |
| DNS | Alert rules | Enabled rules |
| DNS | Alert templates | Enabled templates |
| RDAP | Domain monitors | Enabled monitors |
| RDAP | Alert rules | Enabled rules |
| RDAP | Alert templates | Enabled templates |
| Cert | Certificate monitors | Enabled monitors |
| Cert | Alert rules | Enabled rules |
| Cert | Alert templates | Enabled templates |
| Administration | Users | Active (non-deleted) users |
| API Tokens | Tokens | Active (non-revoked, non-expired) tokens |
Subscription tiers¶
NOB.center offers three tiers: Free, Pro, and Enterprise. Specific quota numbers for each tier are shown in the pricing page and in Administration → Billing & Subscriptions after you log in.
In general:
- Free — suitable for evaluating the platform with a small set of domains
- Pro — designed for teams with a meaningful domain portfolio
- Enterprise — high limits with custom overrides available on request
Tip
You can always see your current usage and remaining quota for each resource type in the Account Settings → Quotas section.
What happens when you hit a quota¶
When you try to create a resource that would exceed your quota, the API returns HTTP 403 with a message like:
Quota exceeded for filters. You have 10 enabled filter(s), limit is 10.
The UI shows the same message inline. No data is lost — you just need to either delete an existing resource or upgrade your subscription.
Disabling vs. deleting¶
Disabling a resource does free an active slot — you can then create a new enabled item in its place. However, you can only hold up to the quota limit in a disabled state at any time. Once you have reached that limit, you must delete a disabled resource before you can disable another.
Example with a limit of 5:
| Action | Enabled | Disabled | Can create? | Can disable? |
|---|---|---|---|---|
| Start | 5 | 0 | No | Yes |
| Disable 2 | 3 | 2 | Yes (+2 free slots) | Yes |
| Create 2 more | 5 | 2 | No | Yes |
| Disable 3 more | 2 | 5 | Yes | No — disabled limit reached |
| Delete 1 disabled | 2 | 4 | Yes | Yes |
To make room for more disabled items, delete one. To make room for more enabled items, disable or delete one.
Upgrading or downgrading¶
When you upgrade, your new limits take effect immediately. When you downgrade (or a subscription is canceled and enters a grace period), resources that exceed the new lower limits are automatically disabled — newest resources first. No data is deleted, but resources above the new limit stop being actively monitored until you are back within quota or upgrade again.
See Billing & Subscriptions for details on grace periods.