A requested cache age from 0 to 24 hours is raised to a 24-hour minimum refresh window.
A standard lookup cannot necessarily force a record refresh more often than this documented window.
Evidence source ↗
WhoisXML API
A hosted REST API that returns domain, IP address, and email WHOIS registration data in structured formats. It is a data lookup API, not a general-purpose web scraping tool.
Developer APIs
Editorial overview
Aggregated Overview
The API offers parsed WHOIS records, JSON and XML responses, multiple request methods, developer libraries, and platform integrations. Pricing is published by query volume, but public review evidence is limited.
This profile combines documented product information and independent evidence where available. It is not a hands-on test unless TechZella explicitly identifies one.
WhoisXML API Decision Snapshot
A quick way to understand who this product may suit, where its limits matter, and which facts are most relevant before you compare alternatives.
Best suited to
Development and security teams that need programmatic access to structured domain, IP, or email registration records within their own applications or investigation workflows.
Look elsewhere if
Buyers seeking a general-purpose web scraper, a self-hosted WHOIS database, or an API that guarantees fresh records on every standard lookup, and should evaluate alternatives such as DomainTools instead.
Platforms
API, Cloud, REST API, Web
TechZella assessment
7.8/10
Overview
WhoisXML API provides programmatic access to domain, IP address, and email WHOIS registration records. Its hosted REST API returns structured data in JSON or XML and supports GET and POST requests.
The product fits applications and security workflows that need registration data enrichment. It is not a general-purpose web scraper: it retrieves WHOIS records rather than extracting arbitrary website content.
WhoisXML API — What Sets It Apart?
These are the product-specific differences that may matter when deciding whether the software fits your workflow. They are based on documented evidence rather than a universal ranking.
- Accepts domain names, IP addresses, and email addresses as lookup inputs.
- Supports automatic selection between WHOIS and RDAP where available, with options to request either protocol.
- Provides multiple request models, including one-time query purchases and recurring monthly or yearly subscriptions.
6 key claims verifiedOur editorial team checked this profile against vendor documentation, product documentation, pricing information. Supported by 3 documented sources.
WhoisXML API Pros & Cons
Pros
- Provides programmatic lookup of WHOIS records for domains, IP addresses, and email addresses.
- Returns structured data in JSON or XML.
- Includes 500 queries on a free account.
- Offers one-time, monthly, yearly, and custom query-volume purchasing options.
- Documents libraries and integrations for common development and security workflows.
Cons
- The free account is capped at 500 queries.
- RDAP is not available for every TLD.
- Standard lookups use cache-age rules; hard refreshes cost five credits.
- Clients must handle documented rate limits and HTTP 429 responses.
WhoisXML API Gotchas & Operational Limits
These are documented constraints or practical friction points that may matter before you adopt the product.
The documented hard-refresh option costs five WHOIS API credits.
Workloads that repeatedly need fresh results can consume credits faster than one credit per lookup.
Evidence source ↗Requests above the standard limit receive HTTP 429 responses.
High-volume integrations need request throttling and retry handling rather than sending unbounded bursts.
Evidence source ↗Security & Privacy
For security-sensitive software, TechZella focuses on documented architecture, authentication, data handling, deployment and privacy details that can affect a buying decision. This is product research, not an independent security audit.
Security posture at a glance
| Deployment | Hosted, server-to-server REST API |
|---|
Security claims are presented only when supported by documented sources. The presence of this section does not constitute a penetration test, certification or independent security audit.
WhoisXML API Pricing & Plans
Free
$0
one-time allowance
500 WHOIS API queries with a free account.
Check current pricing →Monthly subscription
$30
month
Entry listed tier includes 2,000 queries per month; higher query volumes are priced separately.
Check current pricing →One-time purchase
$50
one-time
Listed entry purchase includes 2,000 queries; additional query bundles are priced by volume.
Check current pricing →Yearly subscription
$300
year
Listed entry tier includes 2,000 queries per month; higher query volumes are priced separately.
Check current pricing →Custom
Contact vendor
custom
Custom query volumes are available by contacting the vendor.
Check current pricing →Pricing may change. Verify current plans on the vendor's website.
WhoisXML API Features
WHOIS Lookup
- Look up registration records using a domain name, IP address, or email address
- Choose automatic retrieval or request WHOIS or RDAP where supported
- Request JSON or XML output
API and Integration
- REST API accessed over HTTPS
- GET and POST request methods
- Official developer libraries listed for Java, JavaScript, Python, and Go
- Official integration materials for Splunk, WordPress, and ServiceNow
Usage Controls
- Inspect rate-limit response headers
- Set record cache-age preferences
- Request a hard refresh at a documented cost of five credits
Alternatives
DomainTools is a comparable domain-intelligence provider with WHOIS lookup and history tools, reverse WHOIS, monitoring, and APIs. Its public pricing page separates limited personal access from enterprise offerings. Buyers should compare the specific data, workflow tools, and API access they need.
WhoisXML API Specifications
| Deployment | Hosted, server-to-server REST API |
|---|---|
| API | REST over HTTPS; GET and POST |
| Output formats | JSON and XML |
| Lookup inputs | Domain names, IP addresses, and email addresses |
| Free queries | 500 |
| Standard rate limit | Maximum 200 requests per second; excess requests receive HTTP 429 |
| Developer libraries | Java, JavaScript, Python, and Go |
| Integrations | Splunk, WordPress, ServiceNow, among others |
Deployment & System Footprint
Verified installation, hosting, administration, or environment details that can affect implementation.
| Installation or hosting | Hosted, server-to-server REST API accessed over HTTPS; requests use GET or POST. Source ↗ |
|---|---|
| Integration options | Official materials list libraries for Java, JavaScript, Python, and Go, plus integrations for Splunk, WordPress, and ServiceNow. Source ↗ |
Our evidence-based assessment
TechZella Score
A proprietary editorial score based on product capabilities, usability, value, performance, support and user sentiment evidence.
7.8/10Moderate confidence
The API offers parsed WHOIS records, JSON and XML responses, multiple request methods, developer libraries, and platform integrations. Pricing is published by query volume, but public review evidence is limited.
Methodology v1.0. The assessment weighs feature coverage (25%), ease of use (15%), value for money (20%), performance (15%), support (10%) and user sentiment (15%), using researched product evidence and verified review evidence where available. It is a TechZella editorial assessment, not a direct user-review average.
Editorial transparency
Our Review Methodology
Key claims are linked to the sources used to verify them. This evidence record is separate from third-party user ratings.
TechZella evaluates software using documented product capabilities, pricing information, usability and value considerations, independent user evidence where available, and competitive context. The assessment is an editorial review, not a hands-on test unless one is explicitly identified. Our editorial assessment is based on 3 documented sources.
What TechZella adds
- Accepts domain names, IP addresses, and email addresses as lookup inputs.
- Supports automatic selection between WHOIS and RDAP where available, with options to request either protocol.
- Provides multiple request models, including one-time query purchases and recurring monthly or yearly subscriptions.
Important limitations
- The free account is limited to 500 queries.
- Records may be cached; requests for very fresh data have specific refresh rules, and hard refreshes cost five credits.
- Rate-limit breaches result in HTTP 429 responses until the rate window resets.
Evidence-backed claimsThe service provides WHOIS records for domains, IP addresses, and email addresses. API responses can be requested in JSON or XML. A free account includes 500 WHOIS API queries. The API supports WHOIS and RDAP retrieval, with automatic protocol selection available. The standard documented maximum request rate is 200 requests per second. Official monthly pricing starts at $30 for 2,000 queries per month.
The API request documentation identifies these three supported input types.
View source ↗Verified 2026-10-08The request documentation lists JSON and XML as output formats.
View source ↗Verified 2026-10-08The official documentation states that signup includes a free plan limited to 500 queries.
View source ↗Verified 2026-10-08The request parameters document automatic selection and options to retrieve using RDAP or WHOIS; it notes RDAP is not available for every TLD.
View source ↗Verified 2026-10-08The limits page states the maximum request rate and describes HTTP 429 responses when it is exceeded.
View source ↗Verified 2026-10-08The current pricing page lists a monthly subscription tier at this price and volume.
View source ↗Verified 2026-10-08Community feedback
Reviews
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FAQ
Does WhoisXML API scrape websites? No. This product retrieves WHOIS registration records through an API; it is not a general-purpose website scraping platform.
Is there a free trial? The official documentation describes a free account with 500 queries.
Does it have an API? Yes. The service provides a REST API over HTTPS with GET and POST requests.
Which output formats are available? The API supports JSON and XML.
What does it cost? The listed monthly subscription entry tier is $30 for 2,000 queries per month. One-time and yearly purchase options are also listed.
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