Domain Age Checker — Bulk RDAP Lookup

Check the age, registration date, expiration date, registrar, and nameservers for any list of domains — in bulk, in seconds, with no API key required.

Uses the public RDAP (Registration Data Access Protocol) standard, which replaced WHOIS and is maintained by IANA. Results are structured JSON, ready to export to CSV or feed into your own pipeline.

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Use cases

• SEO research — Filter out freshly registered domains when building link profiles. Old, authoritative domains carry more weight.
• Domain investing — Quickly screen hundreds of domains to find aged assets worth acquiring.
• Fraud & brand protection — Detect newly registered lookalike domains targeting your brand before they are weaponized.
• Competitor intelligence — Find out when your competitors' domains were registered, and how close their renewals are.
• Lead enrichment — Append domain age to your CRM data for scoring and qualification.
• Expired domain hunting — Cross-reference expiration dates against your prospect list.

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Input

{
    "domains": [
        "example.com",
        "google.com",
        "github.com"
    ],
    "maxConcurrency": 5
}

Field	Type	Required	Default	Description
domains	array of strings	Yes	—	Domain names to look up. Do not include http:// or trailing slashes.
maxConcurrency	integer	No	5	Parallel RDAP requests (1–50). Higher = faster, but may hit RDAP rate limits for large batches.

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Output

Each domain produces one item in the dataset:

{
    "domain": "example.com",
    "registered": "1995-08-14",
    "expires": "2025-08-13",
    "ageInDays": 10606,
    "ageInYears": 29.0,
    "registrar": "ICANN",
    "nameservers": [
        "a.iana-servers.net",
        "b.iana-servers.net"
    ],
    "status": "active",
    "error": null
}

Field	Description
domain	Normalised domain name
registered	Registration date (YYYY-MM-DD), or null if unavailable
expires	Expiration date (YYYY-MM-DD), or null if unavailable
ageInDays	Days since registration as of run date
ageInYears	Age rounded to 1 decimal place
registrar	Registrar name from RDAP, or null
nameservers	Array of nameserver hostnames
status	active, not-registered, or error
error	Error message if status is error, otherwise null

Status values

• active — Domain is registered; full data returned.
• not-registered — Domain returned a 404 from RDAP (unregistered or new TLD not in RDAP).
• error — RDAP query failed (timeout, network error, unexpected response).

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Pricing

$0.003 per domain successfully resolved (pay-per-event pricing).

• Unregistered domains (404) and errors are not charged.
• 1,000 domains = $3.00
• 10,000 domains = $30.00

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Performance

• Default concurrency: 5 parallel requests
• Typical latency: 300–800 ms per domain (depends on TLD's RDAP server)
• Recommended max: 20 concurrent for large batches to avoid rate limits

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Limitations

• RDAP coverage depends on the TLD. Most gTLDs (.com, .net, .org, .io) and many ccTLDs are supported. Some legacy or exotic TLDs may fall back to error status.
• RDAP servers occasionally omit fields like registrar or expiration. In those cases the field is null.
• This actor does not use WHOIS as a fallback — RDAP only.

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No API key required

This actor uses the public RDAP standard (https://rdap.org/). No authentication, no API keys, no rate-limit tiers to manage.

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Example: bulk domain age filter for link building

{
    "domains": [
        "moz.com",
        "semrush.com",
        "ahrefs.com",
        "majestic.com",
        "spyfu.com"
    ],
    "maxConcurrency": 10
}

Output will tell you which of these tools has the oldest domain, useful for trust and authority comparisons.

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Run on Apify

No setup needed. Click above to run in the cloud. $0.003 per operation.