Overview
Pass a root domain to query certificate transparency entries and common hostnames in real time. The response pairs each discovered host with its resolved IP addresses, including root domain records and a completion status flag. When queries hit the scan time limit, a note explains truncation. Paid plans can increase detection limits and enable deep wordlist scans.
Live Test Subdomain Finder API →
Endpoint
One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.
curl "https://api.apiverve.com/v1/subdomainfinder?domain=google.com&limit=5&deepScan=true" \
-H "x-api-key: your_api_key_here"const res = await fetch('https://api.apiverve.com/v1/subdomainfinder?domain=google.com&limit=5&deepScan=true', {
headers: { 'x-api-key': 'your_api_key_here' },
});
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
const { data } = await res.json();
console.log(data);import requests
res = requests.get(
"https://api.apiverve.com/v1/subdomainfinder?domain=google.com&limit=5&deepScan=true",
headers={"x-api-key": "your_api_key_here"},
timeout=15,
)
res.raise_for_status()
print(res.json()["data"])package main
import (
"fmt"
"io"
"net/http"
)
func main() {
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/subdomainfinder?domain=google.com&limit=5&deepScan=true", nil)
req.Header.Set("x-api-key", "your_api_key_here")
res, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
defer res.Body.Close()
out, _ := io.ReadAll(res.Body)
fmt.Println(string(out))
}Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.
Authentication
Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.
A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.
Parameters
Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.
| Parameter | Type | Description |
|---|---|---|
domainRequired | string | The domain you want to find all the available subdomains for (e.g. google.com) domain |
limitOptionalPremium | integer | Limit the number of subdomains to detect default 10 · range 1–500 |
deepScanOptionalPremium | boolean | Search the full wordlist instead of only certificate transparency and common names. Slower, and may still report complete: false when the time limit is reached |
Response
Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.
{
"status": "ok",
"error": null,
"data": {
"rootDomain": {
"domain": "paypal.com",
"records": [
"151.101.3.1",
"151.101.195.1",
"162.159.141.96"
]
},
"subDomains": [
{
"host": "api.paypal.com",
"records": [
"66.211.168.123"
]
},
{
"host": "mail.paypal.com",
"records": [
"159.127.187.12"
]
},
{
"host": "admin.paypal.com",
"records": [
"173.0.88.10"
]
},
{
"host": "smtp.paypal.com",
"records": [
"64.4.244.68"
]
},
{
"host": "ns2.paypal.com",
"records": [
"64.4.244.71"
]
},
{
"host": "test.paypal.com",
"records": [
"156.59.125.88"
]
},
{
"host": "ns1.paypal.com",
"records": [
"64.4.244.70"
]
},
{
"host": "mx.paypal.com",
"records": [
"10.190.3.55"
]
},
{
"host": "demo.paypal.com",
"records": [
"151.101.1.21",
"151.101.193.21",
"151.101.129.21",
"151.101.65.21"
]
},
{
"host": "shop.paypal.com",
"records": [
"54.148.26.111",
"35.80.170.143",
"54.212.145.128"
]
},
{
"host": "www.paypal.com",
"records": [
"151.101.193.21",
"151.101.65.21",
"151.101.129.21",
"151.101.1.21"
]
},
{
"host": "m.paypal.com",
"records": [
"151.101.129.21",
"151.101.1.21",
"151.101.193.21",
"151.101.65.21"
]
},
{
"host": "stage.paypal.com",
"records": [
"64.4.241.16"
]
},
{
"host": "ssl.paypal.com",
"records": [
"151.101.65.21",
"151.101.129.21",
"151.101.193.21",
"151.101.1.21"
]
},
{
"host": "i.paypal.com",
"records": [
"63.140.38.107",
"63.140.39.244",
"63.140.39.114",
"63.140.38.116",
"63.140.39.254",
"63.140.39.146",
"63.140.38.213",
"63.140.39.214",
"63.140.39.87",
"63.140.39.123"
]
},
{
"host": "news.paypal.com",
"records": [
"192.243.228.1"
]
},
{
"host": "autodiscover.paypal.com",
"records": [
"52.96.79.120",
"52.96.79.200",
"52.96.163.40",
"52.96.79.248"
]
},
{
"host": "dl.paypal.com",
"records": [
"216.113.188.115"
]
},
{
"host": "connect.paypal.com",
"records": [
"151.101.65.21",
"151.101.129.21",
"151.101.1.21",
"151.101.193.21"
]
},
{
"host": "sandbox.paypal.com",
"records": [
"151.101.195.1",
"162.159.141.96",
"151.101.3.1"
]
},
{
"host": "training.paypal.com",
"records": [
"64.4.254.252"
]
},
{
"host": "c.paypal.com",
"records": [
"151.101.129.21",
"151.101.65.21",
"151.101.193.21",
"151.101.1.21"
]
},
{
"host": "business.paypal.com",
"records": [
"104.18.6.168",
"104.18.7.168"
]
},
{
"host": "service.paypal.com",
"records": [
"192.243.228.1"
]
},
{
"host": "login.paypal.com",
"records": []
},
{
"host": "t.paypal.com",
"records": [
"151.101.3.1",
"151.101.131.1",
"151.101.67.1",
"151.101.195.1"
]
},
{
"host": "status.paypal.com",
"records": [
"20.69.68.249"
]
},
{
"host": "shopping.paypal.com",
"records": [
"208.76.140.165"
]
},
{
"host": "newsletter.paypal.com",
"records": [
"192.243.228.1"
]
},
{
"host": "reports.paypal.com",
"records": [
"173.0.93.28"
]
},
{
"host": "forms.paypal.com",
"records": [
"216.113.190.190"
]
},
{
"host": "labs.paypal.com",
"records": [
"173.0.88.135"
]
},
{
"host": "p.paypal.com",
"records": [
"151.101.131.1",
"151.101.67.1",
"151.101.195.1",
"151.101.3.1"
]
},
{
"host": "transfer.paypal.com",
"records": [
"151.101.193.21",
"151.101.129.21",
"151.101.65.21",
"151.101.1.21"
]
},
{
"host": "xmpp.paypal.com",
"records": [
"173.224.160.144",
"173.224.160.141",
"185.97.80.137",
"185.97.80.136"
]
},
{
"host": "manager.paypal.com",
"records": [
"173.0.93.191"
]
},
{
"host": "developer.paypal.com",
"records": [
"151.101.1.21",
"151.101.193.21",
"151.101.129.21",
"151.101.65.21"
]
},
{
"host": "account.paypal.com",
"records": [
"192.243.228.1"
]
},
{
"host": "history.paypal.com",
"records": [
"151.101.129.21",
"151.101.193.21",
"151.101.65.21",
"151.101.1.21"
]
},
{
"host": "pics.paypal.com",
"records": [
"151.101.131.1",
"151.101.195.1",
"151.101.67.1",
"151.101.3.1"
]
},
{
"host": "registration.paypal.com",
"records": [
"173.0.93.135"
]
},
{
"host": "mcp.paypal.com",
"records": [
"104.18.7.170",
"104.18.6.170"
]
},
{
"host": "accounts.paypal.com",
"records": [
"173.0.93.28"
]
},
{
"host": "hotspot.paypal.com",
"records": [
"64.4.240.12"
]
},
{
"host": "bm.paypal.com",
"records": [
"130.211.16.153"
]
},
{
"host": "rms.paypal.com",
"records": [
"173.0.82.166"
]
},
{
"host": "cb.paypal.com",
"records": [
"173.0.88.142"
]
}
],
"count": 47,
"totalFound": 47,
"complete": true
}
}
Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
rootDomain | object | {...} | The domain that was scanned and its A records |
domain | string | "paypal.com" | The primary domain name for the scan |
records | array | [151.101.3.1, ...] | IP addresses associated with the root domain |
subDomains | array[47] | List of discovered subdomains with their DNS records | |
host | string | "api.paypal.com" | Full hostname of the discovered subdomain |
records | array | [66.211.168.123] | IP addresses resolved for the subdomain |
count | number | 47 | Total number of subdomains discovered in this scan |
totalFound | number | 47 | Total number of subdomains found for the domain. Reads as "N+ (limit reached)" or "N+ (scan time limit reached)" when the scan stopped before exhausting the wordlist |
complete | boolean | true | False when the scan hit its time budget before finishing the wordlist, meaning more subdomains may exist |
Errors
Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.
| Status | Meaning | What to do |
|---|---|---|
400 | Input was rejected | Read error; it names the parameter. |
401 | Key missing or invalid | Check the header name and the key value. |
403 | Key valid, but not permitted | A key restriction or IP allow-list; see key scoping. |
429 | Rate limited, or out of credits | Read error to tell them apart; see rate limits. |
Use cases
- Attack Surface Discovery
- Security engineers scan an organization's primary domain to find forgotten staging hosts and catalog exposed IP addresses before running vulnerability assessments.
- Asset Inventory Auditing
- When auditing corporate infrastructure, IT teams cross-reference discovered subdomain hostnames against internal DNS registers to catch untracked servers and shadow services.
- Bug Bounty Reconnaissance
- Penetration testers submit client domains to map newly issued certificates and gather resolved hostnames prior to testing web applications.
- Phishing Infrastructure Detection
- To catch spoofing campaigns, brand protection platforms query suspicious root domains to inspect resolving hostnames and flag active servers.
Other ways to use Subdomain Finder
Set up Subdomain Finder on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.
Related
More in Domain Data: