The utility connects to WHOIS servers over port 43.
Firewall rules that block outgoing port 43 can prevent lookups from completing.
Evidence source ↗
Bulk Whois Lookup (by NirSoft)
NirSoft’s WhoisThisDomain utility retrieves WHOIS records for one or more domains on Windows. It supports bulk entry, result viewing, and file export.
6 key claims verifiedOur editorial team checked this profile against vendor documentation, pricing information, company information. Supported by 2 documented sources.
Editorial overview
Aggregated Overview
Official documentation verifies multi-domain WHOIS lookup, file export, and freeware licensing. No reliable public review evidence or independent performance assessment was found.
This profile combines documented product information and independent evidence where available. It is not a hands-on test unless TechZella explicitly identifies one.
Overview
“Bulk Whois Lookup” appears to refer to NirSoft’s WhoisThisDomain utility; that is the product name used on NirSoft’s official page. The Windows program retrieves WHOIS records for one or more domains and displays the results in a desktop interface.
Lookup input can include multiple domains, and a separate option creates combinations from domain names and extensions. Results can be saved to files. The utility queries WHOIS servers over port 43, so network access to that port is required.
Bulk Whois Lookup (by NirSoft) 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
Windows users who need to retrieve and export WHOIS records for a list of domains without using a hosted lookup service.
Look elsewhere if
Teams needing a documented API, browser-based access, or queries through web-based WHOIS services; the utility supports WHOIS servers on port 43.
Platforms
Desktop, Windows
TechZella assessment
6.5/10
Bulk Whois Lookup (by NirSoft) — 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 multiple domains in a single lookup session.
- Can build domain combinations from supplied name and extension lists.
- Runs as a local Windows utility and can export selected results.
Bulk Whois Lookup (by NirSoft) Pros & Cons
Pros
- Supports entering multiple domains for lookup.
- Can generate domain combinations from names and extensions.
- Exports selected results to CSV or tab-delimited files.
- Distributed as freeware and runs locally on Windows.
Cons
- Requires outgoing network access to WHOIS servers on port 43.
- Does not support web-based WHOIS requests.
- No API or third-party integrations are documented.
- The official product page lists Windows, not other operating systems.
Bulk Whois Lookup (by NirSoft) Gotchas & Operational Limits
These are documented constraints or practical friction points that may matter before you adopt the product.
It does not support web-based WHOIS requests.
Users whose network or target service requires a browser-based lookup method may need another tool.
Evidence source ↗Bulk Whois Lookup (by NirSoft) Pricing & Plans
Freeware
$0
one-time
The official NirSoft page identifies WhoisThisDomain as freeware. No paid tiers or trial period are listed.
Check current pricing →Pricing may change. Verify current plans on the vendor's website.
Bulk Whois Lookup (by NirSoft) Features
WHOIS lookup
- Retrieve WHOIS records for multiple entered domains
- Select a WHOIS server based on the domain extension
- Supports generic and country-code domains
Domain lists and exports
- Build combinations from domain-name and extension lists
- Load domain lists using command-line options
- Save selected results to CSV or tab-delimited files
Configuration
- Use a custom WHOIS server list
- Use an external whois-server-list.xml file
Bulk Whois Lookup (by NirSoft) Specifications
| Operating system | Windows |
|---|---|
| Deployment | Local executable; no installation process required |
| Network | Internet connection and outgoing WHOIS access on port 43 |
| API | No API documented |
| Integrations | No integrations documented |
| License | Freeware |
| Export formats | CSV and tab-delimited files |
Deployment & System Footprint
Verified installation, hosting, administration, or environment details that can affect implementation.
| Installation or hosting | Download and run the Windows executable; the official page says no installation process or additional DLLs are required. Source ↗ |
|---|
Alternatives
NirSoft also publishes WhoisCL, a separate command-line WHOIS utility for Windows. It may suit scripted command-line workflows, while WhoisThisDomain provides a graphical interface and multi-domain entry. These are separate NirSoft products, not interchangeable product names.
Our evidence-based assessment
TechZella Score
A proprietary editorial score based on product capabilities, usability, value, performance, support and user sentiment evidence.
6.5/10Low confidence
Official documentation verifies multi-domain WHOIS lookup, file export, and freeware licensing. No reliable public review evidence or independent performance assessment was found.
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 2 documented sources.
What TechZella adds
- Accepts multiple domains in a single lookup session.
- Can build domain combinations from supplied name and extension lists.
- Runs as a local Windows utility and can export selected results.
Important limitations
- Requires Windows and an internet connection.
- WHOIS queries use port 43; web-based WHOIS requests are not supported.
- The official page does not document an API or integrations.
Evidence-backed claimsWhoisThisDomain can retrieve records for multiple domains. The utility can generate domain-name and extension combinations. Selected lookup results can be saved to comma-delimited or tab-delimited files. WhoisThisDomain is freeware. The utility requires Windows and an internet connection. The utility supports WHOIS servers on port 43, not web-based WHOIS requests.
The official instructions describe entering multiple domains separated by commas, spaces, or line breaks.
View source ↗Verified 2026-10-08The official documentation describes its Build Domains List option for combining supplied names and extensions.
View source ↗Verified 2026-10-08The official version history documents export options for CSV and tab-delimited files.
View source ↗Verified 2026-10-08The official translated product page identifies the utility's license as freeware.
View source ↗Verified 2026-10-08The official product page lists Windows operating systems and an internet connection in its system requirements.
View source ↗Verified 2026-10-08The official documentation states the port requirement and explicitly excludes web-based WHOIS requests.
View source ↗Verified 2026-10-08FAQ
Is Bulk Whois Lookup a separate NirSoft product?
The official NirSoft product located for this profile is named WhoisThisDomain. Its documented features include looking up multiple domains, which may explain the “Bulk Whois Lookup” label.
Does it support bulk queries?
Yes. The official instructions allow multiple domain names in one input, and describe building combinations from name and extension lists.
What platforms does it support?
The official requirements specify Windows. The page does not document macOS, Linux, or a web application.
Does it have an API or integrations?
No API or third-party integration is documented on the official product page. It does document command-line options for loading domain lists.
Is there a free trial?
The utility is freeware, so the official page does not describe a separate trial period.
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