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Bulk Domain Intelligence: WHOIS/RDAP, DNS, SSL, Availability

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Bulk domain lookup: RDAP/WHOIS registration data, DNS records, SSL certificate and registration availability for up to 100k domains in one normalized JSON per domain. Failed lookups are never charged.

Pricing

from $2.00 / 1,000 domain reports

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Developer

cottony_brittlegill

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Monthly active users

2 months ago

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Categories

Developer tools

Domains

domains

Optional

List of domains to analyze (max 100,000 combined with domainsText; the rest are dropped, with a warning logged). Accepts bare domains or URLs; scheme/www/path are stripped automatically, so www.example.com and example.com count and dedupe as one domain (see keepWww to disable).

Type:array

Max. items:100000

Domains (paste as text)

domainsText

Optional

Alternative to the list above: paste domains separated by newlines or commas. Merged with the list (max 100,000 domains combined).

Type:string

Keep www as a separate domain

keepWww

Optional

By default a leading 'www.' is stripped so www.example.com and example.com are treated as one domain (deduplicated, billed once). Turn this on to keep the www host separate when its own DNS/TLS data genuinely needs to be checked independently from the apex domain.

Type:boolean

Default:false

Include DNS records

includeDns

Optional

NS, A, AAAA, MX, TXT, CNAME. The DNS lookup itself always runs (it's also used internally to detect likely_available domains) — this only controls whether the dns object is included in the output; turning it off does not reduce runtime.

Type:boolean

Default:true

Include SSL certificate

includeSsl

Optional

Issuer, subject CN, SAN, validity window, days to expiry.

Type:boolean

Default:true

WHOIS fallback for TLDs without RDAP

whoisFallback

Optional

When a TLD has no RDAP service, fall back to a WHOIS (port 43) lookup for registration data. Turn off to skip WHOIS and mark such domains as unknown.

Type:boolean

Default:true

Per-registry concurrency

perTldConcurrency

Optional

Kept low to respect registry rate limits (RFC 7480). Only throttles the RDAP/WHOIS registry call — raising it barely changes overall run time once DNS/SSL are enabled, since those aren't limited by this setting. For faster runs, raise globalConcurrency instead.

Type:integer

Minimum:1

Maximum:10

Default:3

Global concurrency

globalConcurrency

Optional

How many domains to process in parallel across all registries. Higher is faster but uses more memory. This is the effective throughput knob for full-signal runs (DNS+SSL enabled): measured ~5x faster (115ms/domain to 24ms/domain) going from the default to the maximum.

Type:integer

Minimum:1

Maximum:50

Default:20

Per-lookup timeout (ms)

lookupTimeoutMs

Optional

How long to wait for each individual RDAP/WHOIS/DNS/TLS lookup before giving up on it (milliseconds).

Type:integer

Minimum:1000

Maximum:60000

Default:10000

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