Exploring CMDB Coverage

  • Release version: Zurich
  • Updated March 1, 2026
  • 2 minutes to read
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    Summary of Exploring CMDB Coverage

    CMDB Coverage addresses the challenge organizations face in verifying the completeness of their CMDB data by correlating IP address management (IPAM) data with discovered configuration items (CIs). It provides an automated, continuous measurement of CMDB discovery completeness by reconciling IP addresses from IPAM systems with discovered CIs, highlighting gaps and missing data to ensure adherence to enterprise standards.

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    Key Features

    • Reconciliation and correlation of IPAM data with discovered CIs to identify coverage gaps.
    • Identification of missing IP addresses and discovery schedule gaps by comparing IPAM subnet data with scheduled discovery ranges for both IPv4 and IPv6.
    • Continuous tracking of coverage status to maintain up-to-date visibility.
    • Roles defined for administrators (sncmdbadmin) who can configure and manage data, and users (sncmdbuser) who can access dashboards and reports.
    • Support for ServiceNow Zurich and Australia releases.

    Benefits

    • Detect potential gaps between IPAM data and scheduled discovery, ensuring no IP addresses are overlooked.
    • Understand the completeness of CMDB discovery data through IPAM and CI correlation.
    • Analyze IP address usage by subnet, including counts of free, reserved, and allocated IP addresses.

    CMDB Coverage Dashboard Insights

    • Infrastructure coverage: Displays the percentage and count of allocated IP addresses associated with CIs versus coverage gaps.
    • IP-to-CI association: Breaks down allocated IP addresses based on single matches, multiple matches, or no matches to CIs.
    • Discovery schedule gaps: Highlights allocated IP addresses present in IPAM but not covered by active discovery schedules.
    • Network coverage metrics: Provides counts of operational managed networks, subnets, and imported allocated IP addresses.
    • Discovery schedule gap metrics: Shows the number and percentage of allocated IP addresses lacking discovery schedule coverage, enabling proactive identification of discovery blind spots.

    Next Steps

    ServiceNow customers can further explore configuring CMDB Coverage, utilizing the dashboard for operational insights, and accessing reference materials to maximize CMDB completeness and accuracy.

    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

    Request apps on the Store

    Visit the ServiceNow Store website to view all the available apps and for information about submitting requests to the store. For cumulative release notes information for all released apps, see the ServiceNow Store version history release notes.

    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: