---
title: "Returns UUIDs of all the instances currently running on the server"
method: HEAD
path: "/simulators/pydss/instances"
tags: ["simulation status"]
---

# Returns UUIDs of all the instances currently running on the server

`HEAD /simulators/pydss/instances`

## Response `200`

UUIDs of all currently running pydss instances have been returned

- object

## Other responses

- `204` — No active pydss instance found

---

[API](https://skmtc.net/natlabrockies/apis/pydss-restful-api-documentation.md) · [All operations](https://skmtc.net/natlabrockies/apis/pydss-restful-api-documentation/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/natlabrockies/pydss-restful-api-documentation/versions/911eb47d43ef/schema)