Bulk domain analysis

What the tool does

The tool collects data about each domain from open sources and puts it into one table. That covers registration and expiry dates, DNS, the site's response, the TLS certificate, Web Archive history and signs of parking or sale. From this, it estimates whether the domain can be acquired.

It is most often run for three tasks.

• picking expired and auction domains: age, archive history and signs of re-registration;
• auditing your own portfolio: expiring registrations, expired certificates, redirect targets;
• cleaning a link donor list of parked domains and domains for sale.

Backlinks, DR and traffic are not shown here. For them, use the bulk domain authority check.

How to use it

One run checks up to 100 domains. The counter next to the buttons shows the number of unique domains. With more than 100, the analysis will not start.

The work takes four steps.

1. Paste domains into the "Domains (one per line, up to 100)" field. Duplicates are dropped, and case does not matter.
2. Click "Analyze". Four domains are processed at a time, and the bar shows progress.
3. Click ▸ at the end of a row to open the details and sources.
4. "Download CSV" saves domain-analysis.csv, and "Clear" resets the field and results.

The server reduces each line to the root domain, dropping the protocol, path and www. So blog.example.com is analyzed as example.com.

How to read the results

The main column is called "Chance to acquire". A green verdict means the domain is available or already being deleted (status redemptionPeriod or pendingDelete). Yellow appears when the registration has expired, expires within 60 days, the domain is for sale, or the sources gave no answer. Red means the domain is taken: it has a site or a parking page, resolves in DNS, or RDAP or WHOIS confirm the registration.

Under the verdict is its confidence. The other columns show the reasons.

• Registration, Age, Expiration: dates from RDAP, or from WHOIS as a fallback. The expiry date is flagged "expired" or "in N d." within 60 days.
• Site: the final HTTP status after up to seven redirects, https:// first, then http://. Codes from 400 are yellow, no response is red.
• TLS: "valid", "expired", "error" (the certificate failed validation) or "none".
• Archive: the first and last year of homepage snapshots in the Web Archive.
• Re-reg.: a percentage estimate that the domain has changed owners. It grows with archive snapshots older than the registration, a fresh registration with a long history, and a deletion status.
• Parking/sale: parking NS, a redirect to a marketplace such as Sedo, Dan or Afternic, or sale text on the page.

The "Data completeness" line in the details counts how many of five sources answered: RDAP or WHOIS, DNS, HTTP, TLS and the Web Archive.

Where the data comes from and limits

The browser sends each domain to the site's server (/api/domain). The server queries rdap.org, WHOIS servers, DNS, the domain and archive.org. All scores are heuristic, so check a domain by hand before buying it.

WHOIS for some zones uses a non-standard format, and dates may not be recognized. Multi-level zones come from a short list such as co.uk or com.ua, so elsewhere the root domain may be wrong. If the server is overloaded, the row gets an error. Then run that domain again.

Sources

These documents describe the protocols and statuses behind the analysis. Use them to check a verdict yourself.

• RDAP.org: RDAP and the rdap.org bootstrap server the tool queries.
• RFC 3912: the WHOIS protocol over TCP port 43.
• ICANN: EPP Status Codes: the redemptionPeriod and pendingDelete statuses before a domain is released.
• Internet Archive: Wayback CDX Server: querying archived snapshots of a URL.

Built by Marko Fedorenko, SEO Expert. Description updated in October 2026.