WhoisXML API Reverse WHOIS vs Whoisology

WhoisXML API Reverse WHOIS9.4Visit Whoisology9.0Visit

Higher score WhoisXML API Reverse WHOIS #1 in Reverse WHOIS Search Tools 9.4/10 Free plan Free plan✓ 6 of 6 features Visit WhoisXML API

vs

Whoisology #3 in Reverse WHOIS Search Tools 9.0/10 Free plan Free plan✓ 5 of 6 features Visit Whoisology

• WhoisXML API Reverse WHOIS fits best

  Broad, flexible reverse-WHOIS investigations

• Whoisology fits best

  Researchers needing historical ownership exploration

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Side by side

Feature	WhoisXML API Reverse WHOIS 9.4/10 Visit ↗	Whoisology 9.0/10 Visit ↗
At a glance
Editor score	9.4	9.0
Ranking	#1 in Reverse WHOIS Search Tools	#3 in Reverse WHOIS Search Tools
Best for	Broad, flexible reverse-WHOIS investigations	Researchers needing historical ownership exploration
Pricing model	Free plan + paid	Free plan + paid
Starting price	Free plan	$300/yr
Free plan	✓	✓
Free trial	—	—
Deployment	Cloud	Cloud
Platforms	Web	Web
Support	Docs	Email
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features WhoisXML API Reverse WHOIS 6/6 · Whoisology 5/6
Person/name search	✓	✓
Organization search	✓ (best)	Not checked yet
Email search	✓	✓
Historical records	✓	✓
Bulk search	✓	✓
API access	✓	✓
Specs
Result limit	10000 results (best)	1000 results
Our review
Pros	Searches names, organizations, emails, phones, and postal addresses Combines historical records, date filters, and exact or fuzzy matching Supports REST API access, JSON/XML output, and pagination beyond 10,000 records	Free access includes reverse and historical WHOIS research Connected-domain exploration links domains through WHOIS fields Paid plans add reports, bulk search, and API credits
Cons	Search requests allow up to four included and four excluded terms Paid usage follows a DRS-credit model with one credit per request Its focus is WHOIS-linked domain discovery rather than broader investigation workflows	Visitor access is limited to a number of results per day Advanced historical access requires a paid membership Higher report and API allowances are reserved for pricier tiers
Our verdict	WhoisXML API Reverse WHOIS searches WHOIS records to find domains connected to owner names, organization names, email addresses, phone numbers, or postal addresses. It supports both current and historical records, making it relevant to… Read the review →	Whoisology is a web-based reverse WHOIS and domain ownership archive for researchers investigating domains, organizations, and historical ownership connections. Its searches can use domain terms and WHOIS fields, including person and email… Read the review →

Strengths and trade-offs

• WhoisXML API Reverse WHOIS — where it wins

  • Searches names, organizations, emails, phones, and postal addresses
  • Combines historical records, date filters, and exact or fuzzy matching
  • Supports REST API access, JSON/XML output, and pagination beyond 10,000 records

  Where it doesn't

  • Search requests allow up to four included and four excluded terms
  • Paid usage follows a DRS-credit model with one credit per request
  • Its focus is WHOIS-linked domain discovery rather than broader investigation workflows

• Whoisology — where it wins

  • Free access includes reverse and historical WHOIS research
  • Connected-domain exploration links domains through WHOIS fields
  • Paid plans add reports, bulk search, and API credits

  Where it doesn't

  • Visitor access is limited to a number of results per day
  • Advanced historical access requires a paid membership
  • Higher report and API allowances are reserved for pricier tiers

• WhoisXML API Reverse WHOIS9.4/10 · Free plan

  A flexible reverse-WHOIS service for current, historical, and large-scale domain investigations.

  Visit WhoisXML APIFull verdict →
• Whoisology9.0/10 · Free plan

  A focused research tool for tracing domain ownership, connections, and historical records.

  Visit WhoisologyFull verdict →