---
sourceDocument: Yokohama IT Operations Management
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/yokohama/it-operations-management

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    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama IT Operations Management

ft:clusterId :

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bundleId :

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workflow :

    - Technology


---

# Schedule a horizontal discovery

# Schedule a horizontal discovery {#ariaid-title1}

* Release version: Yokohama
* 
* Updated January 30, 2025
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 2 minutes to read

A discovery schedule determines what horizontal discovery searches for, when it runs, and which MID Servers are used. Create a discovery schedule for your local environment or a schedule for discovering the resources in your cloud service account.

## Before you begin

Ensure that your discovery schedule conforms to security best practices, such as limiting the range of discovery targets and using the most secure credentials.

Make sure to [test your credentials](https://www.servicenow.com/docs/access?context=t_CreateCredential&version=yokohama&pubname=yokohama-platform-security&ft:locale=en-US) before you run a schedule. Bad credentials are a leading cause of failed discoveries.

Roles required: discovery_admin or admin

## About this task

You can use a discovery schedule to launch horizontal discovery, which uses probes, sensors, and pattern operations to scan your network for CIs. Use this procedure to create a schedule manually from the Discovery Schedules form.

Service Mapping also provides a discovery schedule for top-down discovery. See [Schedule a top-down discovery by Service Mapping](https://servicenow-prod.fluidtopics.net/f0ArHYog5fm~LDBlmp997A "After Service Mapping discovers configuration items (CIs) belonging to your service instance for the first time, it then rediscovers CIs to find changes and updates. Create or modify discovery schedules to control how often Service Mapping rediscovers services or CIs. For example, you may create custom discovery schedules to avoid redundant stress on the infrastructure.") for more information.  
Use the Discovery Schedules module in the Discovery application to:

* Configure a schedule to discover resources in your cloud service account.
* Configure a schedule to discover certificates from URL scans.
* Configure device identification by IP address or other identifiers.
* Determine if credentials are used in device probes.
* Name the MID Server to use for a particular type of discovery.
* Create or disable a schedule that controls when the discovery runs in your network.
* Configure the use of multiple Shazzam probes for load balancing.
* Configure the use of multiple MID Servers for load balancing.
* Run a discovery schedule manually.
* Run a discovery on a single IP address.
{#t_CreateADiscoverySchedule__ul_ytx_x4b_5p}  
Note:  
To view the run-results of your schedules for both IP-based and Cloud Discovery, use the summaries on the [Discovery Home page](https://servicenow-prod.fluidtopics.net/M9rQk36hAXg5UIk3nXL6fw#discovery-home-page "The Discovery Home page provides a summary of discoveries that were triggered by cloud and non-cloud schedules. You can view any errors that occurred during a Discovery and find remediation suggestions. Use the Home page view to examine the cloud resources discovered for the service accounts you selected in a cloud schedule."). The Home page publishes the details of any errors that might have occurred and displays possible actions to take to remediate problems.

## Procedure

1. Navigate to AllDiscoveryDiscovery Schedules to create a new record.
2. Select the type of schedule to open:  
   * New: Creates a new horizontal schedule for discovering components in your network.
   * Quick Discovery: Runs a horizontal discovery on a single IP address without requiring a schedule.
   * Create a Cloud Discovery schedule: Creates a schedule, using the Discovery Manager wizard, for discovering resources in a cloud service account.
   {#t_CreateADiscoverySchedule__ul_j3h_tq1_zhb}
3. Complete the discovery schedule form, using the fields in the table.  
   For more information, see [Discovery Schedule form reference](https://servicenow-prod.fluidtopics.net/4Gyp~1YJnrHuY8E4Gm4ZcA "The Discovery Schedule form provides details about the configuration items (CIs) targeted for discovery, the associated MID Server, and the schedule settings for when and how the discovery runs."). {#t_CreateADiscoverySchedule__ph_Step3Content}
4. Right-click in the header of the record and select Save from the context menu. {#t_CreateADiscoverySchedule__cmd_Step4}
5. To create a range of IP addresses to discover, click Quick Ranges under Related Links.  
   Note:  
   To improve security, limit the range of discovery targets to exclude unnecessary networks and devices. {#t_CreateADiscoverySchedule__cmd_Step5Ranges}
6. Define the frequency of schedule running as described in [Run options for discovery schedules](https://servicenow-prod.fluidtopics.net/FQEx1Q7r3evTxk4Irku21w "Both horizontal and top-down discovery use these run options.").
{#t_CreateADiscoverySchedule__steps_sjl_3dp_qbc}

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