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| Geography | AWS Region | Service VPC Id | Service VPC CIDR | Availability Zone A Subnet | Availability Zone B Subnet |
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| 1 – Development | N. Virginia (us-east-1) | 1 | 10.254.8.0/21 | 10.254.8.0/22 (1019 hosts) | 10.254.12.0/22 |
Mumbai (ap-south-1) | 2 | 10.254.16.0/21 | 10.254.16.0/22 | 10.254.20.0/22 | |
| 2 - General Population | N. Virginia (us-east-1) | 1 | 10.253.8.0/21 | 10.253.8.0/22 (1019 hosts) | 10.253.12.0/22 |
| Ohio (us-east-2) | 2 | 10.253.16.0/21 | 10.253.16.0/22 | 10.253.20.0/22 | |
| N California (us-west-1) | 3 | 10.253.24.0/21 | 10.253.24.0/22 | 10.253.28.0/22 | |
| Singapore | 4 | 10.253.32.0/21 | |||
| 3 - GDPR | Paris (eu-west-3) | 1 | 10.252.8.0/21 | 10.252.8.0/22 (1019 hosts) | 10.252.12.0/22 |
| 4 - Gov Cloud | N. Virginia (us-east-1) | 1 | 10.251.8.0/21 | 10.251.8.0/22 (1019 hosts) | 10.251.12.0/22 |
| 5 - XYZ |
The vast majority of the time there will only be 1 Service VPC in a given geographical area associated with a shard. As with Core VPCs, you’ll be able to tell which geographical region based on the second octet. The associated shard can be determined by looking at the range of the third octet, 10.254.0.0 – 10.254.31.255 indicates shard 1. The Service VPC is determined by the sub range, 10.254.0.0 – 10.254.15.255 for Service VPC 1. The availability zone can be determined by high or low values of the third octet within the VPC range.
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