SSL, DNS & Domains Technical Due Diligence

Domain Ownership, Certificate Lifecycle, and DNS Hygiene

Domain assets are often underexamined during diligence. We verify ownership of all domains, check registration status and renewal dates, and assess transferability. Domain registration under a personal email instead of a company account is a common issue that complicates acquisition. We verify that all relevant domains (primary, variants, country-specific) are owned by the company.

SSL management maturity indicates operational discipline. Teams with automated certificate management and expiration monitoring run reliable operations. Teams with manually managed certificates and no monitoring are one missed renewal away from an outage.

DNS configuration quality reveals how carefully infrastructure is maintained. Clean, well-documented DNS with appropriate TTLs and current records indicates a team that maintains their infrastructure. Stale records, missing documentation, and configuration accumulated over years without review indicate deferred maintenance.

Acquisition Blockers: Domain Disputes, Expired Certs, and Email Gaps

Domain ownership issues are the highest risk. Domains registered under a departed founder’s personal account. Domains with registrar accounts nobody can access. Country-specific domains not included in the asset inventory. Each is a potential blocker for acquisition completion.

SSL and DNS management risks are operational. Missing certificate monitoring means the product is one forgotten renewal from an outage. Misconfigured DNS means changes are risky because nobody fully understands the current configuration. These risks are quantified by impact (outage duration, scope of affected users) and likelihood.

Email deliverability affects customer communication. Missing or incorrect SPF, DKIM, and DMARC records mean transactional emails (password resets, order confirmations) go to spam. This is a product quality issue that often goes unnoticed until customer complaints accumulate.

HTTPS Enforcement, DNSSEC, and Subdomain Takeover Auditing

We examine HTTPS enforcement across all endpoints, including API subdomains and internal tools that are often overlooked. Certificate transparency logs are reviewed to identify any unauthorized certificate issuance for company domains, which can indicate past compromise attempts. We verify HSTS headers are deployed with appropriate max-age values and that preload eligibility is established for primary domains.

DNS security extensions (DNSSEC) adoption is assessed where supported by the registrar and hosting provider. We review CAA (Certificate Authority Authorization) records that restrict which CAs can issue certificates for the domain, a low-effort configuration that significantly reduces the attack surface for certificate-based impersonation. Wildcard certificate usage is evaluated for scope appropriateness, as overly broad wildcards on shared infrastructure create unnecessary risk.

For organizations with complex DNS requirements, we map the full record hierarchy including CNAME chains, delegated subdomains, and third-party service integrations. Latency-based routing, geographic DNS policies, and failover configurations are tested against their intended behavior. This mapping often reveals orphaned records pointing to decommissioned infrastructure, which represent subdomain takeover vulnerabilities that are trivial to exploit and frequently missed in standard security assessments.

Domain Asset Inventory and Transfer Readiness Assessment

The report documents all domain assets, their ownership status, and transfer readiness. SSL and DNS management maturity is scored with specific findings. Security header compliance is assessed against standards. The remediation roadmap addresses domain ownership issues first, then operational improvements.