Configure Shazzam probe
When you run Discovery, the Shazzam probe finds your active network devices by scanning specified ports on specified IP address ranges. If the list of IP ranges being scanned is large, you can configure the Shazzam payload for JSON encoding to reduce its size.
Before you begin
Role required: admin
About this task
You control the behavior of individual Shazzam probes using basic and advanced parameters.
For instructions on configuring probe parameters, see Set probe parameters.
Note: The Shazzam payload is controlled by the following MID Server properties. These properties do not need to be added to the MID Server. The Shazzam probe will fall back on their default values.
- The shazzam.chunk_size property controls the maximum number of IP addresses Shazzam can scan in parallel.
- The mid.shazzam.regulator.interval_ms property sets the interval in which Shazzam can launch packets.
- The mid.shazzam.regulator.packets_per_interval property sets the number of packets that Shazzam can launch in that time interval.
Procedure
-
Navigate to All > Discovery Definition > Probes.
-
Select Shazzam.
-
Add or edit parameters in the Probe Parameters related list.
-
Configure the Shazzam parameters.
These parameters are available for fine-tuning the Shazzam probe. These values are defined in the probe record only.
|
Parameter |
Description |
|---|---|
|
BannerTCP_waitForConnectMS |
Sets the number of milliseconds the BannerTCP scanner waits for a connection and banner.Default: 1500 |
|
debug |
Enables debug logging if set to true.Default: false |
|
delay_wbem |
Delays classification of systems with a WBEM port open until the final Shazzam sensor job. For a large schedule discovering many WBEM ports, delaying classification until the last sensor job could cause the node to run out of memory. Setting this parameter to false allows classification of these systems to occur across all Shazzam sensor jobs.Default: true |
|
DNS_alternativePort |
Deprecated |
|
DNS_waitForResponseMS |
Sets the number of milliseconds the DNS scanner waits for a response.Default: 1000 |
|
GenericTCP_waitForConnectMS |
Sets the number of milliseconds the GenericTCP scanner waits for a connection.Default: 1000 |
|
HTTP_waitForConnectMS |
Sets the number of milliseconds the HTTP scanner waits for a connection.Default: 500 |
|
HTTP_waitForResponseMS |
Sets the number of milliseconds the HTTP scanner waits for a response.Default: 500 |
|
NBT_alternativePort |
Deprecated |
|
NBT_waitForResponseMS |
Sets the number of milliseconds the NBT scanner waits for a response.Default: 500 |
|
shazzam_report_inactive |
When true, reports devices that are alive but inactive. For example, a device has no ports open but refuses at least one port connection request.Default: true |
|
scanner_log |
Enables scanner logging if set to true. This logging information appears in the Shazzam probe response.Default: false |
|
shazzam_report_dead |
When true, reports devices with dead IP addresses. For example, a device that has all ports closed.Default: false |
|
SNMP_alternativePort |
Deprecated |
|
SNMP_tapIntervalMS |
Sets the number of milliseconds the SNMP scanner waits between taps.Default: 1000 |
|
SNMP_taps |
Sets the number of taps (requests) the SNMP scanner attempts.Default: 2 |
|
SNMP_waitForResponseMS |
Sets the number of milliseconds the SNMP scanner waits for a response after the last tap.Default: 1000 |
|
TLS_keepOriginalCertificate |
When true and Discovery is running, the certificate_file field in the cmdb_ci_certificate is populated with the original certificate. This can increase your payload size.Default: false |
Control Shazzam payload size
A system property converts Shazzam payloads into JSON strings, which dramatically reduces their size. This setting prevents nodes from running out of memory when a single schedule discovers large numbers of IP ranges.
Before you begin
Role required: admin
About this task
The glide.discovery.shazzam_ranges_json property is set to true for new instances. This setting encodes the payload as a JSON string. The property is configurable by administrators and is available in the Discovery Definition > Properties module. The property label is Use JSON for IP ranges in Shazzam in the module.
This property is set to false in upgraded instances and is not visible by default. Adding the property manually to your upgraded instance enables the feature, but does not add it to the Discovery Definition > Properties module. To enable JSON encoding and add it to the module, import the update set attached to KB0687626.
Procedure
-
In the navigation filter, type
sys_properties.listand pressEnter. -
In the list of system properties, click New.
-
Complete the form, using these field values:
- Name: glide.discovery.shazzam_ranges_json
- Description: Encodes the Shazzam payload in JSON.
- Value: true
-
Click Submit.
---
title: Configure Shazzam probe
description: When you run Discovery, the Shazzam probe finds your active network devices by scanning specified ports on specified IP address ranges. If the list of IP ranges being scanned is large, you can configure the Shazzam payload for JSON encoding to reduce its size.A system property converts Shazzam payloads into JSON strings, which dramatically reduces their size. This setting prevents nodes from running out of memory when a single schedule discovers large numbers of IP ranges.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/australia/it-operations-management/discovery/t\_ConfigureTheShazzamProbe.html
release: australia
product: Discovery
classification: discovery
topic_type: task
last_updated: "2026-09-10"
reading_time_minutes: 3
breadcrumb: [Port probes, List of Discovery probes, Discovery probes and sensors, Using Discovery, Discovery, ITOM Visibility, IT Operations Management]
---
# Configure Shazzam probe
When you run Discovery, the Shazzam probe finds your active network devices by scanning specified ports on specified IP address ranges. If the list of IP ranges being scanned is large, you can configure the Shazzam payload for JSON encoding to reduce its size.
## Before you begin
Role required: admin
## About this task
You control the behavior of individual Shazzam probes using basic and advanced parameters.
For instructions on configuring probe parameters, see [Set probe parameters](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/it-operations-management/discovery/t_SetProbeParameters.md).
**Note:** The Shazzam payload is controlled by the following [MID Server properties](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/servicenow-platform/r_MIDServerProperties.md). These properties do not need to be added to the MID Server. The Shazzam probe will fall back on their default values.
- The **shazzam.chunk\_size** property controls the maximum number of IP addresses Shazzam can scan in parallel.
- The **mid.shazzam.regulator.interval\_ms** property sets the interval in which Shazzam can launch packets.
- The **mid.shazzam.regulator.packets\_per\_interval** property sets the number of packets that Shazzam can launch in that time interval.
## Procedure
1. Navigate to **All** > **Discovery Definition** > **Probes**.
2. Select **Shazzam**.
3. Add or edit parameters in the **Probe Parameters** related list.
4. Configure the Shazzam parameters.
These parameters are available for fine-tuning the Shazzam probe. These values are defined in the probe record only.
<table id="table_b1y_skz_y1b"><thead><tr><th>
Parameter
</th><th>
Description
</th></tr></thead><tbody><tr><td>
BannerTCP\_waitForConnectMS
</td><td>
Sets the number of milliseconds the BannerTCP scanner waits for a connection and banner.**Default**: 1500
</td></tr><tr><td>
debug
</td><td>
Enables debug logging if set to **true**.**Default**: false
</td></tr><tr><td>
delay\_wbem
</td><td>
Delays classification of systems with a WBEM port open until the final Shazzam sensor job. For a large schedule discovering many WBEM ports, delaying classification until the last sensor job could cause the node to run out of memory. Setting this parameter to **false** allows classification of these systems to occur across all Shazzam sensor jobs.**Default**: true
</td></tr><tr><td>
DNS\_alternativePort
</td><td>
Deprecated
</td></tr><tr><td>
DNS\_waitForResponseMS
</td><td>
Sets the number of milliseconds the DNS scanner waits for a response.**Default**: 1000
</td></tr><tr><td>
GenericTCP\_waitForConnectMS
</td><td>
Sets the number of milliseconds the GenericTCP scanner waits for a connection.**Default**: 1000
</td></tr><tr><td>
HTTP\_waitForConnectMS
</td><td>
Sets the number of milliseconds the HTTP scanner waits for a connection.**Default**: 500
</td></tr><tr><td>
HTTP\_waitForResponseMS
</td><td>
Sets the number of milliseconds the HTTP scanner waits for a response.**Default**: 500
</td></tr><tr><td>
NBT\_alternativePort
</td><td>
Deprecated
</td></tr><tr><td>
NBT\_waitForResponseMS
</td><td>
Sets the number of milliseconds the NBT scanner waits for a response.**Default**: 500
</td></tr><tr><td>
shazzam\_report\_inactive
</td><td>
When **true**, reports devices that are alive but inactive. For example, a device has no ports open but refuses at least one port connection request.**Default**: true
</td></tr><tr><td>
scanner\_log
</td><td>
Enables scanner logging if set to **true**. This logging information appears in the Shazzam probe response.**Default**: false
</td></tr><tr><td>
shazzam\_report\_dead
</td><td>
When **true**, reports devices with dead IP addresses. For example, a device that has all ports closed.**Default**: false
</td></tr><tr><td>
SNMP\_alternativePort
</td><td>
Deprecated
</td></tr><tr><td>
SNMP\_tapIntervalMS
</td><td>
Sets the number of milliseconds the SNMP scanner waits between taps.**Default**: 1000
</td></tr><tr><td>
SNMP\_taps
</td><td>
Sets the number of taps \(requests\) the SNMP scanner attempts.**Default**: 2
</td></tr><tr><td>
SNMP\_waitForResponseMS
</td><td>
Sets the number of milliseconds the SNMP scanner waits for a response after the last tap.**Default**: 1000
</td></tr><tr><td>
TLS\_keepOriginalCertificate
</td><td>
When **true** and Discovery is running, the certificate\_file field in the cmdb\_ci\_certificate is populated with the original certificate. This can increase your payload size.**Default**: false
</td></tr></tbody>
</table>
**Parent Topic:**[Port probes](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/it-operations-management/discovery/r_PortProbes.md)
## Control Shazzam payload size
A system property converts Shazzam payloads into JSON strings, which dramatically reduces their size. This setting prevents nodes from running out of memory when a single schedule discovers large numbers of IP ranges.
### Before you begin
Role required: admin
### About this task
The `glide.discovery.shazzam_ranges_json` property is set to `true` for new instances. This setting encodes the payload as a JSON string. The property is configurable by administrators and is available in the **Discovery Definition** > **Properties** module. The property label is **Use JSON for IP ranges in Shazzam** in the module.
This property is set to `false` in upgraded instances and is not visible by default. Adding the property manually to your upgraded instance enables the feature, but does not add it to the **Discovery Definition** > **Properties** module. To enable JSON encoding and add it to the module, import the update set attached to [KB0687626](https://support.servicenow.com/nav_to.do?uri=%2Fkb_view.do%3Fsysparm_article%3DKB0687626%26sysparm_stack%3D%26sysparm_view%3D).
### Procedure
1. In the navigation filter, type `sys_properties.list` and press `Enter`.
2. In the list of system properties, click **New**.
3. Complete the form, using these field values:
- **Name**: glide.discovery.shazzam\_ranges\_json
- **Description**: Encodes the Shazzam payload in JSON.
- **Value**: true
4. Click **Submit**.
| title | Configure Shazzam probe |
| description | When you run Discovery, the Shazzam probe finds your active network devices by scanning specified ports on specified IP address ranges. If the list of IP ranges being scanned is large, you can configure the Shazzam payload for JSON encoding to reduce its size.A system property converts Shazzam payloads into JSON strings, which dramatically reduces their size. This setting prevents nodes from running out of memory when a single schedule discovers large numbers of IP ranges. |
| locale | en-US |
| canonical_url | https://www.servicenow.com/docs/r/australia/it-operations-management/discovery/t\_ConfigureTheShazzamProbe.html |
| release | australia |
| product | Discovery |
| classification | discovery |
| topic_type | task |
| last_updated | 2026-09-10 |
| reading_time_minutes | 3 |
| breadcrumb | Port probesList of Discovery probesDiscovery probes and sensorsUsing DiscoveryDiscoveryITOM VisibilityIT Operations Management |