The Best WHOIS Lookup Tools in 2026
We researched WHOIS lookup tools through official websites, including pricing pages, plan tables and product documentation. Rankings focus on the category’s core job, value for money and verified features, so buyers can compare domain record coverage, registrar details, historical data and access options in one place.
Our top picks
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Top ranked
WhoisDataCenter#1 of 279.4/10A broad WHOIS research service with useful free allowances and paid data products.
Free plan
-
Runner-up
WhoisXML API WHOIS API#2 of 279.2/10A broad lookup API with RDAP, parsed data, integrations, and a free tier.
Free plan
-
Top-ranked free plan
WhoisJSON API#4 of 278.8/10A focused domain-intelligence API with a free tier and plans from $10/month.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 27 tools, best first
-
Best forInvestigators needing current and historical WHOIS
A broad WHOIS research service with useful free allowances and paid data products.
- Historical WHOIS
9.4/10★★★★★Try WhoisDataCenter -
Best forAPI users needing broad lookup and integrations
A broad lookup API with RDAP, parsed data, integrations, and a free tier.
- Bulk lookup
- RDAP support
9.2/10★★★★★Visit WhoisXML API -
Best forLarge-scale WHOIS API and dataset buyers
A pay-as-you-go WHOIS platform for high-volume lookups, history, reverse search, and datasets.
- Historical WHOIS
- Bulk lookup
- RDAP support
9.0/10★★★★☆Visit Whoxy -
Best forAPI users needing WHOIS plus domain intelligence
A focused domain-intelligence API with a free tier and plans from $10/month.
8.8/10★★★★☆Visit WhoisJSON -
Best forHigh-volume WHOIS intelligence teams
A broad WHOIS API for security, research, and domain intelligence at scale.
- Historical WHOIS
- Bulk lookup
- RDAP support
8.6/10★★★★☆Visit WhoisFreaks -
Best forTechnical users wanting open-source RDAP
A flexible, open-source RDAP client for technical users who want control over queries and output.
- RDAP support
8.4/10★★★★☆Visit OpenRDAP -
Best forDevelopers needing a polished RDAP API
A developer-focused lookup API with normalized JSON, bulk requests, and broad lookup coverage.
- Bulk lookup
- RDAP support
8.2/10★★★★☆Visit RDAP API -
Best forTeams wanting web lookup plus an API
A practical WHOIS and RDAP lookup service with web access, parsed results, exports, and APIs.
- RDAP support
8.0/10★★★★☆Visit ViewDNS -
Best forWHOIS users wanting reverse and DNS tools
A broad WHOIS, DNS, reverse lookup, and API toolkit with free web access.
- RDAP support
7.9/10★★★★☆Visit ViewDNS.info -
Best forBroad-TLD WHOIS API integrations
A broad-TLD WHOIS API with a free tier and paid automation options.
7.8/10★★★★☆Visit IP2WHOIS -
Best forFree Windows desktop WHOIS research
A free Windows WHOIS tool for multi-domain research and export.
- Bulk lookup
7.7/10★★★★☆Visit NirSoft -
Best forFree authoritative domain and network lookups
A focused, free lookup tool for current domain, IP network, and ASN registration data.
- RDAP support
7.6/10★★★★☆Visit ICANN Lookup -
Best forDevelopers wanting an open RDAP endpoint
An open-source RDAP client with web access and a documented HTTP endpoint.
- RDAP support
7.4/10★★★★☆Visit RDAP.org -
Best forProfessional parsed WHOIS API coverage
A parsed WHOIS API with broad TLD coverage and live access on higher tiers.
7.2/10★★★★☆Visit WhoAPI -
Best forDevelopers needing asynchronous bulk WHOIS
A focused API for structured WHOIS lookups, bulk processing, and asynchronous retrieval.
- Bulk lookup
7.1/10★★★★☆Visit Bulk WHOIS API -
Best forAPI users focused on historical WHOIS retrieval
A focused API for retrieving historical WHOIS records with flexible query and output options.
- Historical WHOIS
7.0/10★★★★☆Visit WhoisXML API -
Best forResearchers investigating ownership changes
A focused web tool for tracing domain ownership, registrar, and record changes over time.
- Historical WHOIS
6.9/10★★★☆☆Visit WhoisXML API -
Best forBulk WHOIS processing at very large scale
A high-volume WHOIS API for investigations, research, and list-based workflows.
- Bulk lookup
6.6/10★★★☆☆Visit WhoisXML API -
Best forFree general-purpose domain WHOIS checks
A free web lookup for domain status, registration details, IPs, and availability.
6.5/10★★★☆☆Visit Whois.com -
Best forFree broad WHOIS lookups across many identifiers
A free web lookup tool covering domains, IP addresses and autonomous system numbers.
6.4/10★★★☆☆Try DNSlytics WHOIS -
Best forFree users wanting practical WHOIS basics
A free web WHOIS lookup for practical domain-registration details.
- Bulk lookup
6.3/10★★★☆☆Visit MXToolbox -
Best forSolo users wanting WHOIS plus site utilities
A free WHOIS and domain utility suite for solo research, marketing, and development work.
6.2/10★★★☆☆Visit CubDomain -
Best forGoogle Registry domain checks
A free web RDAP lookup for registration data in Google Registry top-level domains.
- RDAP support
6.1/10★★★☆☆Open RDAP Lookup -
Best forSimple authenticated RDAP domain checks
A free web client for simple anonymous or token-authenticated RDAP checks.
- RDAP support
5.8/10★★★☆☆Visit WebNIC -
Best forLightweight JSON WHOIS API calls
A focused JSON API for live WHOIS and related domain intelligence calls.
5.7/10★★★☆☆Visit JsonWhois.io -
Best forOne-off free domain WHOIS checks
A straightforward web tool for checking one domain’s WHOIS and registration details.
5.6/10★★★☆☆Visit EZWHOIS -
Best forHistorical domain-report investigations
A focused web tool for assembling historical WHOIS and domain-connection reports.
- Historical WHOIS
5.4/10★★★☆☆Visit DomainTools
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | API access | Bulk lookup | Score |
|---|---|---|---|---|---|---|
| 1 | WhoisDataCenter | Yes | Full | 9.4 | ||
| 2 | WhoisXML API WHOIS API | Yes | Full | Yes | 9.2 | |
| 3 | Whoxy | No | $10/unit one-time | Full | Yes | 9.0 |
| 4 | WhoisJSON API | Yes | $10/mo | 8.8 | ||
| 5 | WhoisFreaks WHOIS API | No | $63/mo | Full | Yes | 8.6 |
| 6 | OpenRDAP | Yes | Free | Full | 8.4 | |
| 7 | RDAP API | No | $9/mo | Full | Yes | 8.2 |
| 8 | ViewDNS WHOIS Lookup | Yes | Full | 8.0 | ||
| 9 | ViewDNS.info | Yes | Full | 7.9 | ||
| 10 | IP2Location.io IP2WHOIS | Yes | $49/mo | Full | No | 7.8 |
| 11 | WhoisThisDomain | Yes | Free | None | Yes | 7.7 |
| 12 | ICANN Lookup | Yes | Free | None | No | 7.6 |
| 13 | RDAP.org Lookup | Free | Full | 7.4 | ||
| 14 | WhoAPI | No | $52/mo | Full | No | 7.2 |
| 15 | Bulk WHOIS API | No | $9.99/mo | Full | Yes | 7.1 |
| 16 | WhoisXML API WHOIS History API | Yes | Full | 7.0 | ||
| 17 | WhoisXML API WHOIS History Search | Yes | Full | 6.9 | ||
| 18 | WhoisXML API Bulk WHOIS API | Yes | Full | Yes | 6.6 | |
| 19 | Whois.com WHOIS Lookup | Yes | Free | 6.5 | ||
| 20 | DNSlytics WHOIS | Yes | None | No | 6.4 | |
| 21 | MXToolbox WHOIS Lookup | Yes | Free | Limited | Yes | 6.3 |
| 22 | CubDomain | Yes | Free | 6.2 | ||
| 23 | Google Registry RDAP Lookup | Free | None | 6.1 | ||
| 24 | WebNIC RDAP Client | Yes | Free | None | No | 5.8 |
| 25 | JsonWhois.io | Yes | Full | No | 5.7 | |
| 26 | EZWHOIS | Yes | Free | 5.6 | ||
| 27 | DomainTools Domain Report | No | None | No | 5.4 |
Head-to-head All 28 comparisons →
- WhoisDataCenter vs WhoisXML API WHOIS API
- WhoisDataCenter vs Whoxy
- WhoisDataCenter vs WhoisJSON API
- WhoisDataCenter vs WhoisFreaks WHOIS API
- WhoisDataCenter vs OpenRDAP
- WhoisDataCenter vs RDAP API
- WhoisDataCenter vs ViewDNS WHOIS Lookup
- WhoisXML API WHOIS API vs Whoxy
- WhoisXML API WHOIS API vs WhoisJSON API
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How we rank WHOIS lookup tools
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update