SecurityTrails

SecurityTrails is a comprehensive domain and DNS intelligence platform that provides historical DNS data, subdomain discovery, and passive DNS reconnaissance capabilities.

DNS Intelligence Passive DNS Subdomain Discovery Historical Records

Overview

SecurityTrails offers a powerful DNS intelligence platform that enables security professionals to discover and analyze domain relationships, historical DNS records, and subdomain infrastructure. The platform aggregates passive DNS data, WHOIS information, SSL/TLS certificates, and domain ownership details to provide comprehensive visibility into an organization's digital footprint. SecurityTrails features a user-friendly web interface, REST API, and bulk data access for large-scale investigations. It is widely used for threat hunting, incident response, domain monitoring, and cybersecurity research.

Primary Use Cases

✔ Discovering all subdomains and associated IP addresses for a target organization to map the complete attack surface.

✔ Investigating domain ownership changes and historical WHOIS records to identify potential typosquatting or domain hijacking.

✔ Threat hunting by identifying malicious infrastructure through DNS correlations and historical data analysis.

Frequently Asked Questions

SecurityTrails is a DNS intelligence platform that aggregates passive DNS data, historical WHOIS records, SSL/TLS certificates, and domain ownership information. It works by continuously collecting and indexing DNS resolution data from multiple sources worldwide, allowing users to query historical and current DNS records for any domain or IP address.

SecurityTrails provides comprehensive DNS record types including A, AAAA, CNAME, MX, NS, TXT, SOA, and SRV records. The platform includes both current and historical DNS data, allowing users to see how DNS configurations have changed over time for any domain.

Yes, SecurityTrails provides a comprehensive REST API that allows programmatic access to all platform features including domain search, DNS history, WHOIS data, SSL certificate information, and subdomain discovery. The API includes rate limiting, authentication via API keys, and supports both JSON and XML response formats.

Passive DNS refers to DNS data collected without actively querying DNS servers, typically by observing and recording DNS resolutions from various sources. It's important for security because it provides historical visibility into domain-to-IP relationships, helps identify malicious infrastructure, reveals domain ownership changes, and supports threat hunting investigations without alerting targets.

SecurityTrails integrates with various security tools through its REST API, enabling workflows with SIEM platforms, threat intelligence platforms, incident response systems, and automation frameworks. Users can also export data in CSV, JSON, or XML formats for import into other tools and can use the API for automated domain monitoring and alerting.

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Category Info

Platforms that provide comprehensive DNS data, historical records, passive DNS, and domain intelligence for security investigations and reconnaissance.

Added On

August 18, 2026

Last Updated

August 18, 2026