Enterprise Subdomain Monitoring
Detect vulnerable and dangling DNS records to prevent subdomain takeover before attackers can exploit them.
CSC Subdomain Monitoring gives enterprises greater visibility across their DNS environment, helping security teams identify changes and vulnerabilities that could leave subdomains exposed to hijacking.
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Daily monitoring of CSC-managed DNS records
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Alerts when DNS records or subdomain status changes
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Greater visibility to help identify and clean up legacy DNS records
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Prevent subdomain hijacking caused by dangling DNS
Subdomain hijacking can occur when cybercriminals exploit abandoned or improperly configured DNS records, also known as dangling DNS, to take control of an unused subdomain.
For enterprises managing large and complex domain portfolios, outdated records can remain after marketing campaigns, cloud migrations, mergers and acquisitions, or other changes to the digital estate. If those records are not identified and removed, they can create opportunities for attackers to redirect traffic, distribute malware, conduct phishing attacks, or impersonate the organization.
Inactive or misconfigured DNS record Dangling DNS Vulnerable subdomain Potential takeover
Strengthen your enterprise DNS security
CSC's Subdomain Monitoring solution helps organizations maintain visibility across complex DNS environments and identify potentially vulnerable records before they can be exploited.
Better visibility
Gain visibility into DNS and subdomain changes that could create security risks across your digital portfolio.
Improved security posture
Identify legacy and dangling DNS records that may remain after campaigns, infrastructure changes, or services have been retired.
Built for global enterprises
Support complex, multinational DNS environments with continuous monitoring, automated alerts, and actionable information.
Continuous visibility into your DNS environment
It can be difficult for organizations to account for every digital asset and determine which DNS records remain critical, active, or redundant.
CSC Subdomain Monitoring helps identify changes to DNS records and subdomain status and provides context that allows teams to assess the issue and take appropriate action.
CSC monitors your CSC-managed DNS records each day for changes that may indicate potential security issues.
Receive alerts when zones change from active to inactive so your team can determine whether records should be removed or whether another issue needs to be resolved.
Create an ongoing process for identifying and cleaning up outdated DNS records.
Give security and domain teams the information needed to investigate detected changes and determine the appropriate response.
Subdomain Monitoring integrates with CSC DomainSecSM, CSC's cyber-intelligence platform.
AI is accelerating subdomain takeover risk
Enterprises with large domain portfolios can accumulate unused or misconfigured subdomains over time. Attackers increasingly use automated tools and AI to identify dangling DNS at greater speed and scale. This reduces the time between a DNS record becoming vulnerable and an attacker potentially discovering it. Proactive subdomain monitoring helps organizations identify exposed records earlier, maintain better DNS hygiene, and reduce opportunities for subdomain takeover.
Greater control across large domain portfolios
Subdomain risk increases as organizations manage more domains, DNS records, regions, technology providers, and digital initiatives.
CSC Subdomain Monitoring is particularly relevant for organizations with:
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Large or multinational domain portfolios
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Complex DNS environments
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Frequent marketing campaigns or temporary digital properties
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Regular cloud or infrastructure changes
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Multiple internal teams managing digital assets
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Strong cybersecurity, governance, or compliance requirements
For organizations in regulated industries such as financial services and healthcare, maintaining visibility and control over DNS records can also support broader cybersecurity governance and compliance objectives.
Enterprise-class domain security expertise
CSC helps global organizations manage and secure complex domain portfolios and digital assets. Subdomain Monitoring extends that visibility to DNS records that can become vulnerable when services, campaigns, or infrastructure are retired or changed.
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Enterprise-class domain security positioning
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Global capabilities
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Integration with DomainSecSM
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Existing approved client proof, awards, or security credentials relevant to DBS
Frequently asked questions
Subdomain hijacking occurs when an attacker exploits an unused or misconfigured subdomain, often through an abandoned or dangling DNS record. This can allow the attacker to redirect traffic or use the trusted subdomain for malicious activity.
Subdomain monitoring tracks DNS record and subdomain-status changes so potentially vulnerable records can be identified and investigated before attackers exploit them.
CSC monitors CSC-managed DNS records daily and alerts customers to changes, including instances where zones move from active to inactive.
Organizations with large domain portfolios typically have more DNS records, digital properties, campaigns, and infrastructure changes to manage. This increases the possibility that legacy or unused records remain active and become vulnerable over time.