DNS resource record classes

  • Release version: Yokohama
  • Updated January 30, 2025
  • 3 minutes to read
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    Summary of DNS resource record classes

    The CMDB CI Class Models ServiceNow Store app enhances the Configuration Management Database (CMDB) by adding or updating classes for DNS resource records (RR). These classes integrate DNS record data into the CMDB class hierarchy, enabling applications like Discovery and Service Mapping Patterns to discover and populate Configuration Items (CIs) related to DNS technologies and software.

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    DNS resource records store essential information about domain names, such as IP addresses (A and AAAA records), mail servers (MX records), and domain aliases (CNAME records). The app supports managing these records within the CMDB to improve visibility and lifecycle management of DNS-related assets.

    Key Features

    • Extended CMDB classes: Adds models for DNS records including A, AAAA, CNAME, MX, and ALIAS, with updated identification rules and relationships.
    • Deprecation: Existing DNS record classes like A, AAAA, and CNAME in the base CMDB schema are deprecated as of release 1.57, replaced by these enhanced classes.
    • Detailed record attributes: Classes capture critical DNS details such as IP addresses, canonical names, service providers, TTL (Time to Live), and domain registration information.
    • Integration capabilities: Enables auto-population of DNS records from registrar integrations and links DNS data to related IP Address Management (IPAM), certificates, and CDN providers.
    • Domain ownership tracking: Supports domain information tracking with attributes like domain name, registrar, registry domain ID, creation and update dates, and registration expiration.

    Practical Benefits for ServiceNow Customers

    • Comprehensive DNS management: Centralize DNS resource records in the CMDB to improve asset tracking and governance.
    • Improved discovery and mapping: Leverage DNS classes in Discovery and Service Mapping to accurately populate and maintain DNS-related CIs.
    • Lifecycle tracking: Facilitate workflows for requesting, approving, and tracking domain name registrations as part of IT and business processes.
    • Enhanced integrations: Connect DNS data seamlessly to IPAM systems, SSL certificate management, and CDN providers for holistic infrastructure visibility.

    The CMDB CI Class Models ServiceNow Store app adds or updates classes for DNS records, also known as a DNS resource records (RR).

    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.

    The CMDB CI Class Models app adds class models that extend the CMDB class hierarchy, including class descriptions, identification rules, identifier entries, and, if applicable, dependent relationships. You can use the added classes just like any other CMDB class. Applications such as Discovery and Service Mapping Patterns can use the class extensions to populate CIs and discover technologies and software.

    See the full release notes for all CMDB CI Class Models.

    DNS zone resource records

    A DNS record is an entry in the domain name system (DNS) database that provides information about a specific aspect of a domain name. Each DNS record contains data associated with a domain name, such as IP addresses, mail server addresses, or other resources. Each type of record serves a specific purpose, such as mapping domain names to IP addresses (A records), identifying mail servers for a domain (MX records), and providing aliases for domain names (CNAME records), among others. DNS resource records are essential for the proper functioning of the DNS infrastructure on the internet.

    Note:
    In CMDB CI Class Models release 1.57, existing classes in the CMDB schema that represent DNS resource records like A, AAAA, CName, and so on are deprecated. The following classes are defined with an ideal base, child class, and identification rule.

    Supported DNS resource record types

    • A Record: Holds the IP address of a domain.
    • AAAA Record: Contains the IPv6 address of a domain.
    • CNAME Record: Forwards one domain or subdomain to another domain. Does not provide an IP address.
    • MX Record: Directs mail to an email server.
    The supported record types enable actions like the following:
    • Capture domain name registration in the CMDB and create workflow to request, approve, and track life cycle.
    • Auto-populate the data from integration to the registrar.
    • Connect the data to an IPAM record.
    • Connect the data to the certificate on the DNS.
    • Connect the data to the CDN provider.
    Figure 1. DNS resource record classes integrated with the CMDB class hierarchy
    DNS resource record class model.

    Table: cmdb_ci_dns_resource_record

    This section lists the classes that the CMDB CI Class Models store app adds or updates. For the list of classes in the base system, including classes that this app might extend, see CMDB tables descriptions.

    DNS record detail from Domain Name Server (DNS) for a WWW domain.

    Column Description Details

    DNS Service Provider [service_provider]

    Replaces the deprecated column: DNS Service Provider [name]

    		 Defines which DNS service provider supplied this value, examples like Cloudflare,Google DNS, OpenDNS, Local DNS,Private DNS,empty, and so on.

    Identification Rule (name+service_provider) allow null

    String (255)
    Time to Live [ttl] Time, in seconds, that a DNS record will be cached by an outside DNS server or resolver. integer
    Record Class [record_class] Class of DNS record.
    • IN (Internet) (default)
    • CH (Chaosnet)
    • HS (Hesiod)

    Table: cmdb_ci_dns_zone_a_record

    A records hold only IPv4 addresses.

    Column Description Details
    A IP Address [ip_address] IPv4 address ip_addr

    Identification Rule (name+service_provider+ip_address) allow null

    Table: cmdb_ci_dns_zone_aaaa_record

    AAAA records hold only IPv6 addresses.

    Column Description Details
    AAAA IP Address [ip_address] IPv6 address ip_addr

    Identification Rule (name+service_provider+ip_address) allow null

    Table: cmdb_ci_dns_zone_cname_record

    A canonical name (CNAME) record points from an alias domain to a canonical domain.

    Column Description Details
    Canonical Name [cname] Fully qualified domain name / Canonical Name. String (255)

    Identification Rule (name+service_provider+cname) allow null

    Table: cmdb_ci_dns_zone_alias_record

    An ALIAS record points domain name to a hostname instead of an IP address.

    Column Description Details
    Alias Name [alias_name] Alias name of the DNS record. String (255)

    Identification Rule (name+service_provider+alias_name) allow null

    Table: cmdb_ci_dns_domain_info

    Domain Name enables you to trace ownership and tenure of domain name details using DNS lookup tools like whois.

    Column Description Details
    Domain Name [domain_name] WWW Domain Name value from the DNS lookup tool. String (255)

    Identification Rule (Name)
    Registry Domain ID [registry_domain_id] Registry Domain ID value from the DNS lookup tool. String (255)
    Registrar [registrar] Registrar value from the DNS lookup tool. String (255)
    Domain Creation Date [domain_creation_date] Creation Date of the domain from the DNS lookup tool. glide_date_time
    Domain Updated Date [domain_updated_date] Updated Date of the domain from the DNS lookup tool. glide_date_time
    Registrar Registration Expiration Date [registrar_registration_expiration_date] Registrar Registration Expiration Date value from the DNS lookup tool. glide_date_time