Azure Event Grid quotas and limits

This article lists quotas and limits in Azure Event Grid.

Quotas and limits

The following limits apply to Azure Event Grid topics (system, custom, and partner topics).

Note

These limits are per region.

Resource Limit
Custom topics per Azure subscription 100.
When the limit is reached, you can consider a different region or consider using domains, which can support 100,000 topics.
Event subscriptions per topic 500
This limit can't be increased.
Publish rate for a custom or a partner topic (ingress) 5,000 events/sec or 5 MB/sec (whichever is met first)
Event size 1 MB
This limit can't be increased.
Number of incoming events per batch 5,000
This limit can't be increased.
Private endpoint connections per topic 64
This limit can't be increased.
IP Firewall rules per topic 128

The following limits apply to Azure Event Grid domains.

Resource Limit
Topics per event domain 100,000
Event subscriptions per topic within a domain 500
This limit can't be increased.
Domain scope event subscriptions 50
This limit can't be increased.
Publish rate for an event domain (ingress) 5,000 events/sec or 5 MB/sec (whichever is met first)
Event Domains per Azure Subscription 100
Private endpoint connections per domain 64
IP Firewall rules per domain 128

Next steps

See Azure subscription and service limits, quotas, and constraints for quotas and limits of all Azure services.