---
title: "GET /#Action=ModifyDBSubnetGroup"
method: GET
path: "/#Action=ModifyDBSubnetGroup"
---

# GET /#Action=ModifyDBSubnetGroup

`GET /#Action=ModifyDBSubnetGroup`

Modifies an existing DB subnet group. DB subnet groups must contain at least one subnet in at least two AZs in the Amazon Web Services Region.

## Query parameters

- `DBSubnetGroupName` string, required
- `DBSubnetGroupDescription` string
- `SubnetIds` string[], required
- `Action` 'ModifyDBSubnetGroup', required
- `Version` '2014-10-31', required

## Response `200`

Success

## Other responses

- `480` — DBSubnetGroupNotFoundFault
- `481` — DBSubnetQuotaExceededFault
- `482` — SubnetAlreadyInUse
- `483` — DBSubnetGroupDoesNotCoverEnoughAZs
- `484` — InvalidSubnet

---

[API](https://skmtc.net/aws/apis/rds.md) · [All operations](https://skmtc.net/aws/apis/rds/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/aws/rds/versions/e6b3ad7df19b/schema)