# Community Checker

The Community Checker utility of the OpUtils [SNMP Tools](https://www.manageengine.com/products/oputils/snmp-tools.html) scans a range of IP addresses to retrieve their SNMP read and write community strings based on a pre-defined set of default and standard community strings of switches, routers, and other devices.

## To Get the SNMP Community String

1. Click the **Tools** tab.
2. Choose **Community Checker** under the **SNMP Tools** category.
3. Select whether you want to scan:
   - A range of IP addresses, or
   - A single device.
4. Based on your selection, specify:
   - The start and end IP addresses, or
   - The IP address/host name of the device.
5. Click **Get Community**.
6. Check the results. The read and write community string details of the devices will be listed.

   **Not Responded** in the result could be due to the following reasons:
   - The device did not respond to any of the available community strings.
   - The device is not SNMP-enabled (if both read and write communities could not be determined).

## To Add/Edit Community Strings

The Community Checker tool uses a pre-defined set of read and write community strings to determine a device’s community. You can add or edit this list to include the community strings used in your network.

1. Select the **Add/Edit Community** tab.
2. Specify the read and write community strings and click **Add**.

Learn more about [SNMP Tools](https://www.manageengine.com/products/oputils/snmp-tools.html).