WhoisXML API has been the default choice for domain data for years. 50+ data products, 25 billion+ historical WHOIS records, 7,596+ TLDs. For enterprise security teams and threat intelligence workflows, it is hard to beat.

But three things push developers to look elsewhere:

Opaque pricing. WhoisXML uses credit-based pricing that is not listed on their website. You get 500 free queries on signup, then you need to contact sales for a quote. For a startup or solo developer trying to estimate costs, that is a blocker.

Complexity. 50+ products means 50+ separate APIs, each with its own documentation, pricing, and rate limits. If you need domain registration data and IP lookups, that is two products to evaluate and two billing lines to manage. For teams that just need "give me the registrar, dates, and nameservers for this domain," the platform can feel oversized.

WHOIS deprecation. ICANN sunsetted WHOIS in January 2025. 374+ gTLDs have shut off port 43. WhoisXML now offers RDAP as a protocol option alongside WHOIS, but the product suite was originally built on WHOIS parsing. Newer tools are built on RDAP from the ground up.

If any of those apply to you, here is what else exists.

Parsed WHOIS APIs

These services query WHOIS (and increasingly RDAP) servers, parse the responses, and return structured JSON. They are the closest drop-in replacements for WhoisXML.

Whoxy

Whoxy is the cheapest option for pay-as-you-go lookups. Credits never expire. Pricing scales with volume:

Queries	Price	Per 1,000
1,000	$2	$2.00
50,000	$75	$1.50
250,000	$300	$1.20
1,000,000	$1,000	$1.00
10,000,000	$5,000	$0.50

Also offers WHOIS history ($5/1k queries) and reverse WHOIS ($10/1k queries) at separate rates. Supports 1,595 TLDs.

Good if your volume is irregular and you do not want a monthly bill. Also one of the few affordable options for reverse WHOIS (find all domains registered by an email or organization).

WhoisFreaks

WhoisFreaks offers both monthly subscriptions ($75/month for 50,000 credits) and one-time purchases ($15 for 5,000 lookups). Includes WHOIS history and reverse lookups. 500 free credits on signup.

Good if you need historical WHOIS records alongside current data without paying enterprise prices.

WhoAPI

WhoAPI has been running for 13+ years. $52/month for 40,000 requests, $499/month for 100,000. Unlike most providers that only do WHOIS, WhoAPI bundles DNS lookups, SSL certificate checks, and domain availability into the same API and the same quota. One integration, multiple data types.

Good if you want a mature provider with predictable monthly pricing and you need more than just registration data.

WhoisJSON

WhoisJSON is a simpler, developer-focused option. 1,000 queries/month free, then $10/month for 30,000 or $30/month for 150,000.

Good if you want transparent pricing and a generous free tier for prototyping. No reverse WHOIS or history -- just current registration data.

WhoisJsonAPI

WhoisJsonAPI (different from WhoisJSON above) offers high-volume plans at competitive per-query rates. $50/month for 2 million requests, $125/month for 5 million, $290/month for 15 million. Supports 1,000+ TLDs. Free tier: 500 requests/month. All plans include a 7-day free trial with no credit card required.

Good if you need very high volume at the lowest per-query cost. At $50/month for 2M requests, the effective cost is $0.025 per 1,000 queries -- far cheaper than any other paid provider on this list.

IP2WHOIS

IP2WHOIS is part of the IP2Location platform. Domain WHOIS is bundled with IP geolocation -- you cannot buy WHOIS access separately. Pricing:

Plan	WHOIS queries/mo	Price	Overage
Free	500	$0	--
Starter	5,000	$49/mo	$10 per 1k extra
Plus	40,000	$249/mo	$50 per 8k extra
Security	150,000	$499/mo	$100 per 30k extra

Supports 1,221 TLDs and 634 ccTLDs. SDKs for PHP, Python, Go, Node.js, and Ruby.

Good if you already use IP2Location for geolocation and want WHOIS data from the same vendor. Less compelling if you only need WHOIS -- you are paying for the full IP geolocation suite.

RDAP-native option: RDAP API

RDAP API takes a different approach. Instead of parsing WHOIS and adding RDAP as a fallback, it is built on RDAP from the start. It queries RDAP servers directly and returns normalized, flat JSON.

What that means in practice:

Bootstrap discovery is handled for you. You do not need to maintain IANA's TLD-to-server mapping.
Thin-registry follow-through merges data from registrar RDAP servers (e.g., Verisign + MarkMonitor for .com domains) into a single response.
vcardArray parsing is gone. Contact data comes back as flat fields, not nested RFC 6350 arrays.
One API for multiple object types. Domains, IPs, ASNs, nameservers, and entities all use the same token, the same base URL, the same response format.

RDAP API does not offer historical WHOIS records, reverse WHOIS, threat intelligence, or domain reputation scoring. If you need those, WhoisXML API or WhoisFreaks are better options.

Plans start at $9/month for 30,000 lookups (Starter), $49/month for 200,000 (Pro), and $199/month for 1,000,000 (Business). Free trial, no credit card. SDKs for Python, Node.js, PHP, Go, and Java.

A typical response looks like this:

curl -H "Authorization: Bearer YOUR_TOKEN" \
  "https://rdapapi.io/api/v1/domain/google.com?follow=true"

{
  "domain": "google.com",
  "status": ["client delete prohibited", "server transfer prohibited"],
  "registrar": {
    "name": "MarkMonitor Inc.",
    "iana_id": "292",
    "abuse_email": "[email protected]"
  },
  "dates": {
    "registered": "1997-09-15T04:00:00Z",
    "expires": "2028-09-14T04:00:00Z",
    "updated": "2019-09-09T15:39:04Z"
  },
  "nameservers": ["ns1.google.com", "ns2.google.com", "ns3.google.com", "ns4.google.com"],
  "dnssec": false,
  "entities": {
    "registrant": {
      "organization": "Google LLC",
      "country_code": "US"
    }
  }
}

Flat JSON, no vcardArray, no nested entity arrays. Every TLD returns the same structure.

Free option: query RDAP servers directly

You can skip all providers and query RDAP servers yourself. It is free, it is authoritative, and it works right now:

curl https://rdap.verisign.com/com/v1/domain/google.com

Every gTLD registry runs an RDAP server. The IANA bootstrap registry maps TLDs to their servers. The data is the same source every provider on this list uses.

The catch is everything you need to build around it: bootstrap discovery, per-server rate limits (some servers ban you for 24 hours after a burst), thin-registry follow-through for .com/.net, vcardArray parsing, and field normalization across registries that implement the standard differently. For a detailed breakdown, see what building on raw RDAP involves.

At 10 lookups a day, this is the obvious choice. At 10,000, the engineering and maintenance costs add up.

When to stay with WhoisXML API

This post is about alternatives, but WhoisXML is still the right tool for certain jobs:

Historical WHOIS records. 25 billion+ records. No one else has that depth. If you need to see who owned a domain in 2018, this is where you go.
Threat intelligence workflows. Domain reputation, brand monitoring, phishing detection, malware domain feeds. WhoisXML has built an entire platform around this.
One-vendor compliance. If your procurement process favors a single established vendor with SOC 2 and a long track record over multiple smaller tools, WhoisXML simplifies that.

Quick comparison

	Protocol	Pricing	Free tier	History	Reverse WHOIS
WhoisXML API	WHOIS + RDAP	Credit-based (contact sales)	500 queries	Yes (25B+)	Yes
Whoxy	WHOIS	Pay-as-you-go ($2-0.40/1k)	--	Yes	Yes
WhoisFreaks	WHOIS	$75/mo or one-time	500 credits	Yes	Yes
WhoAPI	WHOIS	$52/mo for 40k	--	No	No
WhoisJSON	WHOIS	$10-30/mo	1,000/mo	No	No
WhoisJsonAPI	WHOIS	$50-290/mo (2M-15M)	500/mo	No	No
IP2WHOIS	WHOIS	$49-499/mo (bundled)	500/mo	No	No
RDAP API	RDAP	$9-199/mo	7-day trial	No	No
Direct RDAP	RDAP	Free	Unlimited	No	No

WhoisXML API Alternatives: 7 Options Compared (2026)