Exploring CMDB Coverage

  • Release version: Australia
  • Updated March 12, 2026
  • 2 minutes to read
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    Summary of Exploring CMDB Coverage

    CMDB Coverage is a ServiceNow application designed to help organizations ensure the completeness of their Configuration Management Database (CMDB) discovery data. It automates the continuous measurement of CMDB discovery completeness by correlating IP address data from IP Address Management (IPAM) systems with discovered configuration items (CIs). This correlation addresses the common challenge where discovery tools alone cannot confirm the completeness of CMDB data due to lack of integration with IPAM data.

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    Key Features

    • Reconciliation and Correlation: Automatically matches IPAM IP addresses with discovered CIs to identify missing or unmatched data.
    • Gap Identification: Highlights missing IP address coverage and gaps in discovery schedules to ensure compliance with enterprise standards.
    • Continuous Tracking: Monitors ongoing coverage and detects discovery schedule gaps by comparing IPAM subnet data against configured discovery ranges for both IPv4 and IPv6.
    • Dashboard Insights: Provides detailed metrics including infrastructure coverage percentages, IP-to-CI association breakdowns, discovery schedule gaps, and network/subnet statistics.

    User Roles

    • sncmdbadmin: Can configure the application, including creating, reading, writing, and deleting records across relevant CMDB Coverage tables to manage coverage data.
    • sncmdbuser: Has read-only access to view data and dashboards to monitor CMDB coverage status.

    Benefits for ServiceNow Customers

    • Improved CMDB Completeness: Gain visibility into discrepancies between IPAM data and discovery schedules to improve the accuracy and completeness of your CMDB.
    • Discovery Optimization: Identify IP addresses missing from discovery schedules, enabling targeted discovery adjustments and reducing blind spots.
    • Network Utilization Insights: Understand IP address usage, including free, reserved, and allocated IPs per subnet to aid in network management and planning.
    • Compliance and Governance: Maintain compliance with enterprise standards by continuously tracking and closing gaps in IP address coverage.

    What to Expect

    By implementing CMDB Coverage, customers can expect a continuous, automated assessment of their CMDB’s discovery completeness. The integrated dashboard offers actionable insights into IP address coverage and discovery schedule gaps, enabling proactive management of network assets and improved data reliability within the CMDB.

    Next Steps

    • Configure CMDB Coverage to align with your organization’s IPAM and discovery tools.
    • Use the CMDB Coverage dashboard regularly to monitor coverage metrics and address identified gaps.
    • Refer to ServiceNow documentation for detailed configuration guidance and advanced usage scenarios.

    Learn about CMDB Coverage and review the benefits it can provide for users in your organization.

    CMDB Coverage overview

    Organizations often can't identify whether their CMDB data is complete despite using discovery tools because the discovery data and IPAM data aren't correlated. CMDB Coverage provides an automated solution that continuously measures CMDB discovery completeness by correlating IP addresses from IPAM systems with discovered configuration items (CIs).

    The CMDB Coverage application includes the following features:
    • Reconciliation and correlation of IPAM data with discovered configuration items (CIs).
    • Identification of missing data and highlighting the gaps in IP address coverage to ensure compliance with enterprise standards.
    • Continuous coverage tracking.

    • Discovery schedule gap detection, where the IPAM subnet data is compared to the scheduled discovery ranges (IPv4 and IPv6 addresses) to identify missing scheduled discovery ranges.

    Supported versions

    Supported ServiceNow versions:
    • Zurich
    • Australia

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    CMDB Coverage users

    Table 1. CMDB Coverage user roles
    User role Description
    sn_cmdb_admin Users with the sn_cmdb_admin role can configure the application. These users can create, read, write, and delete records in the following tables:
    • CMDB Coverage Initialization Tracker [sn_cmdb_ip_cov_init_tracker]
    • Binary IP Address [sn_cmdb_ip_cov_binary_ip_address]
    • IP Coverage CI Table Configuration [sn_cmdb_ip_cov_ci_config]
    • IP Address Staging [sn_cmdb_ip_cov_ip_staging]
    • Discovery schedule gap [sn_cmdb_ip_cov_discovery_schedule_gap]
    • Discovery schedule gaps to allocated IP [sn_cmdb_ip_cov_m2m_discovery_schedule_gap]
      Note:
      The sn_cmdb_ip_cov_m2m_discovery_schedule_gap table is not populated by default. For information about how to populate data in this table, see Custom system property.
    sn_cmdb_user Users with the sn_cmdb_user role can read the data in the tables and view the dashboard.​

    CMDB Coverage benefits

    Table 2. CMDB Coverage benefits
    Benefit Feature

    Identify potential gaps between IPAM data and what is scheduled to be discovered in the configured discovery tools.

    Find missing IPAM IP addresses in discovery

    Understand the completeness of the CMDB discovery data.

    Reconcile and correlate IPAM data with discovered CIs

    Identify the number of free, reserved, and allocated IP addresses per subnet.

    Analyze IP address usage per subnet

    CMDB Coverage dashboard

    The CMDB Coverage dashboard provides the following information:
    • Infrastructure coverage: The percentage of allocated IP addresses that are associated with CIs in the CMDB. The total coverage count and coverage gap count are displayed.
    • IP-to-CI association​: Breakdown of how allocated IP addresses map to CMDB CIs. The distribution across single match, multiple matches, and no match categories are displayed.
    • Discovery schedule gap count​: The number of allocated IP addresses that exist in IPAM but are not covered by any active discovery schedule.
    • Network coverage
      • Total number of networks: The number of operational managed networks that are configured in the CMDB.
      • Total number of subnets​: The number of operational IP network subnets that are defined in the CMDB.
      • Total number of IP address​es: The number of allocated IP addresses that are imported from IPAM sources.
    • Discovery schedule gap
      • Missing IP addresses (Allocated IPs without discovery schedule): The number of allocated IP addresses from IPAM that are not covered by any active discovery schedule, indicating potential gaps in discovery coverage.
      • Percentage of missing IP addresses: The percentage of total allocated IP addresses that lack discovery schedule coverage.

    What to explore next

    To learn more about configuring and using CMDB Coverage, see: