Server Load Balancer provides an API to query the default limits of an SLB instance. For more information, see Query Quota-DescribeSlbQuotas.
| Resource | Default limits |
|---|---|
| Limits on SLB instances | |
| Number of SLB instances per account | 60 |
| Number of times that an ECS instance can be added to SLB instances | 50 |
| Number of backend servers that can be added to an SLB instance | 200 |
| Number of listeners that can be added to an SLB instance | 50 |
| Number of domain /URL forwarding rules that can be added to a Layer-7 listener | 20 |
| Number of domain name extensions that an HTTPS listener can create | 3 |
| Number of API calls per an AccessKey | 5,000 times/day |
| Frontend/backend port range used by a listener | 1-65535 |
| Frontend/backend port range used by a listener (Financial Cloud) | 80, 443, 2800-3300, 5000-10000, 13000-14000 |
| Limits on certificates | |
| Number of server certificates that can be uploaded in a region | 1,000 |
| Number of CA certificates that can be uploaded in a region | 100 |
| Limits on access control lists | |
| Number of access control lists that can be created in a region | 50 |
| Number of access control entries that can be added to an access control list | 300 |
| Number of IP entries that can be added to an access control list in an API call | 50 |
| Number of times that an access control list can be added to listeners | 50 |