WHOIS & Domain Intelligence Guides
In-depth technical guides covering domain registration data, WHOIS privacy, DNS diagnostics, and IP allocation.
Domain Security
Understanding WHOIS Privacy Protection and GDPR Privacy Rules
Learn how WHOIS privacy guard services and GDPR redact domain registrant personal information while maintaining legal compliance.
SEO Intelligence
How to Check Domain Age and Historical Creation Date via WHOIS
A complete guide to reading WHOIS creation dates, registry expiration dates, and tracking domain history for SEO audits.
Domain Management
Domain Expiration Lifecycle: Auto-Renew, Grace Period, and Pending Delete
Detailed breakdown of the ICANN domain lifecycle stages: Active, Grace Period, Redemption Period, and Pending Delete.
Protocols
RDAP vs WHOIS: Why Registration Data Access Protocol is Replacing WHOIS
Compare RDAP and port 43 WHOIS protocol, focusing on RESTful JSON output, standard HTTP queries, and granular access controls.
DNS Analysis
How to Find Authoritative Nameservers using WHOIS and DNS Queries
Learn how to query root NS records via WHOIS and Dig to identify domain DNS hosting providers.
Domain Flipping
Detecting High-Value Expired Domains with Automated WHOIS Scripts
Automate WHOIS queries in Python and Node.js to spot dropped domains and backlinks before public auctions.
Domain Management
Understanding EPP Transfer Auth Codes and Domain Locking
How to unlock domain names, retrieve EPP authorization keys, and safely transfer domains between registrars.
Cyber Intelligence
Reverse WHOIS Lookup: How to Find All Domains Owned by an Entity
Discover how cybersecurity researchers use reverse WHOIS databases to uncover domain networks and brand infringements.
Domain Management
Interpreting ICANN Domain Status Codes (OK, clientHold, clientTransferProhibited)
A reference guide to ICANN EPP status codes found in WHOIS output and what they mean for domain operation.
Network Intelligence
How to Lookup IP Address Ownership using ARIN, RIPE, and APNIC WHOIS
Perform IP WHOIS lookups across global Regional Internet Registries (RIRs) to trace network blocks and ISP allocation.
DNS Analysis
DNS SOA (Start of Authority) Records: Technical Audits & Zone Transfers
Understand DNS SOA fields including serial numbers, refresh timers, and primary name servers for infrastructure troubleshooting.
Domain Security
Preventing Domain Hijacking: Registrar Locks, 2FA, and Registry Locks
Essential security measures to protect valuable domains from unauthorized transfers, DNS tampering, and account takeovers.
Development
Automating Bulk WHOIS Lookups using Node.js and Python Scripts
Write rate-limited command-line tools to query WHOIS servers concurrently without getting IP-rate-limited.
Cyber Intelligence
Identifying Malicious Domains using WHOIS Threat Intelligence
How SOC analysts use domain registration timestamps, registrar patterns, and WHOIS anomalies to detect phishing sites.
Domain Management
Finding Abuse Contacts and Registrar Information from WHOIS Data
Locate registrar abuse emails, telephone numbers, and legal service addresses from official WHOIS records.
Domain Security
Country Code TLDs (ccTLDs) and WHOIS Privacy Policy Differences
Understand specific WHOIS data disclosure rules for .uk, .de, .ca, and .au domains compared to standard .com gTLDs.
Development
Dig, Nslookup, and WHOIS CLI Masterclass for Network Engineers
Essential Linux terminal command-line examples for performing DNS lookups, reverse WHOIS, and tracing network hops.
Development
Parsing Unstructured WHOIS Output into Standardized JSON Data
Overcome text formatting inconsistencies across different registrar WHOIS servers using custom parser rules.
Domain Flipping
Using WHOIS Data for Domain Brokerage and Direct Owner Outreach
How to ethically contact domain owners using administrative contacts and proxy email forwarders.
Domain Security
Checking DNSSEC Status and Cryptographic Signatures in WHOIS
Verify whether DNSSEC (signed/unsigned) is enabled on a domain to prevent DNS spoofing and cache poisoning.