Rexxfield & WhoisXML API: Advancing Cybercrime Investigations with Domain Intelligence
About
Rexxfield is a cyber investigations firm that identifies, tracks, and disrupts online fraud and digital threats. By combining technical analysis with investigative tradecraft, the firm uncovers the networks behind offenses like phishing, business email compromise, cryptocurrency fraud, and financial crime schemes.
Rexxfield works closely with law enforcement and legal teams on complex, cross-border cases to build evidence, support asset tracing, and deliver evidence-based insights that help clients mitigate risk and pursue accountability.
- Location
- U.S.
- Industry
- Cybersecurity
- Products used
DNS Database Download
Reverse WHOIS API
WHOIS APIHighlights
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Domain intelligence is essential for mapping and attributing cybercriminal infrastructure
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Expanding from a single indicator to a broader network is critical in investigations
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WhoisXML API enables faster, deeper domain forensics at scale
Uncovering and Attributing Complex Malicious Infrastructure
Cybercrime investigations often begin with limited indicators such as a suspicious domain or IP address. From there, investigators must determine who is behind the infrastructure and how extensive it is.
For Rexxfield, this requires mapping domain ecosystems, linking related campaigns, and supporting attribution in legal and enforcement contexts. Traditional methods made it difficult to expand investigations efficiently. Rexxfield needed a reliable and scalable source of domain and DNS intelligence to accelerate this process.
Integrating Domain Intelligence into Investigative Workflows
Rexxfield partnered with WhoisXML API to embed domain intelligence into its investigative workflows.
This allows investigators to:
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Pivot from a single domain or IP to related assets
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Map interconnected infrastructure across fraud networks
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Correlate registrant, DNS, and historical data
Combined with Rexxfield’s investigative techniques, these capabilities help produce actionable, evidence-based intelligence for clients, legal teams, and law enforcement, supporting investigations and downstream actions such as attribution and disruption.
“WhoisXML API acts as a force multiplier for us. It allows us to gain more evidence faster and provides visibility into attacker infrastructure that we haven’t had before.”
Faster Investigations and Stronger Attribution
The partnership has significantly enhanced Rexxfield’s investigative capabilities, delivering measurable and operational improvements:
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50% reduction in investigation time: WhoisXML API data reduces time to actionable intelligence compared to traditional methods
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Deeper infrastructure visibility: Investigators can map entire domain ecosystems and uncover hidden relationships
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Stronger attribution: Linking domains, IPs, and registrant data strengthens attribution efforts
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More effective disruption: Enhanced intelligence supports takedowns, mitigation strategies, and legal action
By enabling rapid expansion from isolated indicators to full infrastructure mapping, WhoisXML API acts as a force multiplier for Rexxfield—helping the firm uncover evidence faster, close cases more efficiently, and deliver more comprehensive insights to clients and partners.
Learn how WhoisXML API intelligence can help you achieve success