DNS lookup API

A DNS lookup API over DNS over HTTPS: name a domain, choose record types — A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV — and every record returns as its own row with owner name, type, TTL and value. MX rows name a domain's mail provider, TXT rows carry its SPF policy and verification tokens, A and AAAA rows say where it is hosted.

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$0.0002 per delivered record · $2 free every month · Failed runs never billed

POST /v1/scraper/collectors/dns_records/run

$ curl $QD/dns_records/run \
    -H "Authorization: Bearer $QD_API_KEY" \
    -d '{}'
{ "status": "done", "count": 10,
  "results": [
    {
      "domain": "…",
      "type": "…",
      "ttl": …,
      "value": "…" } ],
  "cost": 0.002 }
# 10 records × $0.0002 · nothing delivered, nothing charged

$0.0002 / record10,000 records on the free $2 every month

Semantic inputdomain, types, max_results — no URL lists

Up to 100records per run, pagination handled for you

No browserread over HTTP/TLS — cheaper and faster than rendering

What a DNS lookup API does

Any shell has dig; a DNS API earns its place by giving you rows instead of resolver output. Queries go through Google's DoH endpoint and land as uniform records, so a column of domains becomes a table of mail, hosting and delegation facts you can group, count and join like any other dataset here.

Used as an MX record API it classifies mail providers across a domain list; used as a TXT record API it reads the SPF includes and verification tokens — google-site-verification and its provider-specific cousins — that reveal which SaaS vendors a company has wired in. Both are enrichment columns hiding in public records.

What one record looks like

Every delivered record carries these fields. Nullable means the source did not publish it — the field stays empty instead of being guessed.

Field	Type	What it holds
`rank`	integer	1-based position.
`domain`	string	Record owner name.
`type`	string	Record type.
`ttl`	integer · nullable	TTL seconds.
`value`	string	Record data.

Inputs

The whole request. Anything you leave out falls back to the default shown in the catalog.

Input	Type	Required	What it does
`domain`	string	yes	Domain to resolve.
`types`	array	no	Default: A, AAAA, MX, TXT, NS.
`max_results`	integer	no	How many records to deliver at most (1–100). You pay only for delivered records.

Pricing

DNS lookup API pricing

$0.0002 per delivered record. A run that delivers nothing costs nothing: blocked pages, challenges and retries are on us, and the $2 monthly allowance covers about 10,000 records before you spend anything.

$0.0002per delivered record$0.2 per 1,000 delivered records

10,000 recordson the free allowance$2 every month, no card

Zero rowszero chargeblocks, captchas and retries are on us

−30%on volume tiersthe catalog returns your key's price

Pay as you go

$0/mo

$2 free credit / month
60 requests / min
List unit prices

Starter

$19/mo

$15 free credit / month
300 requests / min
10% off unit prices

Growth

$79/mo

$50 free credit / month
600 requests / min
20% off unit prices

Scale

$299/mo

$250 free credit / month
1,200 requests / min
30% off unit prices

Same wallet, same key and same $2 monthly allowance as every other Data API. Prices are launch pricing read live from the billing config — GET /v1/scraper/collectors returns the price your key actually pays.

Integration

One POST, typed rows

Base URL https://api.quanticdata.io/v1, Bearer auth, the same key as every other Data API. Endpoint: POST /v1/scraper/collectors/dns_records/run.

curl -X POST https://api.quanticdata.io/v1/scraper/collectors/dns_records/run \
  -H "Authorization: Bearer $QD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{}'

import requests

r = requests.post(
    "https://api.quanticdata.io/v1/scraper/collectors/dns_records/run",
    headers={"Authorization": f"Bearer {QD_API_KEY}"},
    json={},
    timeout=120,
)
for row in r.json()["payload"]["results"]:
    print(row)

const res = await fetch(
  "https://api.quanticdata.io/v1/scraper/collectors/dns_records/run",
  {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.QD_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({}),
  },
);
const { payload } = await res.json();
console.table(payload.results);

claude mcp add quantumproxies \
  -e QUANTUMPROXIES_API_KEY=qd_live_your_key_here \
  -- npx -y quantumproxies-mcp

# then, in the chat:
> run the dns_records collector with

What people build with the DNS lookup API

Three shapes of work this endpoint was designed around.

Email-provider firmographics

MX values across a company list split it by mail stack — Google Workspace here, Microsoft 365 there — one row per record, ready to group.

SaaS-stack detection

TXT rows expose SPF includes and verification tokens, which read as a list of the vendors a domain has onboarded.

Hosting inventories

A and AAAA rows map a set of domains to the addresses serving them, TTLs included, for an infrastructure table refreshed on every sweep.

DNS lookup API versus rolling your own

The differences that actually cost time when you build this in-house.

	DIY scraper	This collector
Answer format	dig output or zone text to parse	One row per record: owner, type, TTL, value
Transport	UDP resolvers and whatever sits in the path	DNS over HTTPS to a public resolver
Multiple types	One query per record type in a loop	Up to nine types fanned out in a single call

FAQ

Questions we get about the DNS lookup API.

Something else? Ask us →

Which DNS record types can I query?

Nine: A, AAAA, MX, TXT, NS, CNAME, SOA, CAA and SRV. Leave types empty and the first five resolve by default, which covers hosting, mail and delegation in one pass.

How do I read MX and TXT records for company enrichment?

Set types to MX and TXT: the MX values name the mail provider and the TXT values carry SPF and verification tokens, so a plain domain column grows provider and vendor signals from one call per domain.

Which resolver answers the queries?

Google's public DNS-over-HTTPS endpoint. Answers arrive as consistent JSON wherever you run, each row keeping the TTL the resolver reported, with no UDP resolver or middlebox in the path to garble them.

Is there a free DNS lookup API?

Every account gets $2 of credit every month with no card, which is about 10,000 delivered records on this endpoint at $0.0002 each. It renews monthly, and a run that delivers nothing is never billed — so a failed or blocked attempt does not eat the allowance.

How much does one run cost?

Multiply the rows you actually receive by $0.0002. A run capped at 100 records — the maximum for this collector — costs $0.02 if every row comes back, and less when the source has fewer. Volume tiers take up to 30% off, and GET /v1/scraper/collectors returns the price your key actually pays.

Run the DNS lookup API now

$2 of free credit every month, no card. Your key returns its own prices from GET /v1/scraper/collectors.

Get my free API key