This topic lists the resource quotas of Server Load Balancer (SLB).
SLB provides an API to query the default limits of an SLB instance.
| Resource | Default limit |
|---|---|
| Limits on SLB instances | |
| The number of SLB instances per account | 30 |
| The number of times that an ECS instance can be added to SLB instances | 50 |
| The number of backend servers that can be added to an SLB instance | 200 |
| The number of listeners that can be added to an SLB instance | 50 |
| The number of domain name-based and URL-based forwarding rules that can be added to a Layer-7 listener | 40 |
| The number of domain name extensions that an HTTPS listener can create | 3 |
| The frequency of API calls per AccessKey | 5,000 times/day |
| The frontend and backend port range used by a listener (public cloud) | 1-65535 |
| The frontend and backend port range used by a listener (Ant Financial Cloud) | 80, 443, 2800-3300, 5000-10000, 13000-14000 |
| Limits on certificates | |
| The number of server certificates that can be uploaded in a region | 100 |
| The number of CA certificates that can be uploaded in a region | 100 |
| Limits on access control lists | |
| The number of access control lists that can be created in a region | 50 |
| The number of IP entries that can be added to an access control list | 300 |
| The number of IP entries that can be added to an access control list in an API call | 50 |
| The number of times that an access control list can be added to listeners | 50 |