# SSL Certificate & Subdomain Finder for Any Website (`scrapemint/ssl-subdomain-finder`) Actor Find all the subdomains of any website and check its SSL certificates. Paste a domain and get every subdomain seen in public certificate records, plus the certificate issuer, valid dates and days until expiry. Great for security checks and finding forgotten sites. No API key needed. - **URL**: https://apify.com/scrapemint/ssl-subdomain-finder.md - **Developed by:** [Ken M](https://apify.com/scrapemint) (community) - **Categories:** Developer tools, Business - **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks - **User rating**: No ratings yet ## Pricing Pay per usage This Actor is paid per platform usage. The Actor is free to use, and you only pay for the Apify platform usage, which gets cheaper the higher subscription plan you have. Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-usage ## What's an Apify Actor? Actors are a software tools running on the Apify platform, for all kinds of web data extraction and automation use cases. In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours, and optionally produces a well-defined JSON output, datasets with results, or files in key-value store. In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server. Actors are written with capital "A". ## How to integrate an Actor? If asked about integration, you help developers integrate Actors into their projects. You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready. The best way to integrate Actors is as follows. In JavaScript/TypeScript projects, use official [JavaScript/TypeScript client](https://docs.apify.com/api/client/js.md): ```bash npm install apify-client ``` In Python projects, use official [Python client library](https://docs.apify.com/api/client/python.md): ```bash pip install apify-client ``` In shell scripts, use [Apify CLI](https://docs.apify.com/cli/docs.md): ````bash # MacOS / Linux curl -fsSL https://apify.com/install-cli.sh | bash # Windows irm https://apify.com/install-cli.ps1 | iex ```bash In AI frameworks, you might use the [Apify MCP server](https://docs.apify.com/platform/integrations/mcp.md). If your project is in a different language, use the [REST API](https://docs.apify.com/api/v2.md). For usage examples, see the [API](#api) section below. For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt). # README ## SSL Certificate & Subdomain Finder for Any Website Find every subdomain of a website and check its SSL certificates in one run. Paste a domain like `github.com` and get one clean row per subdomain, with the certificate issuer, valid dates and how many days until it expires. Built for **security teams, IT admins, penetration testers and website owners**. Forgotten subdomains and expired certificates are two of the most common ways websites get attacked or go down. This finds both, using only public data, with no signup or API key. ### What you get - **Every subdomain** seen in public SSL certificates for the domain (the standard passive discovery method, via certificate transparency logs from SSLMate certspotter, with crt.sh as backup). - **Certificate records**: the issuer and valid dates from the newest certificate on file for each subdomain. - **Live certificate check** (on by default): connects to each subdomain over HTTPS and reads its current certificate: - who issued it - valid from and valid to dates - **days until it expires** (great for catching renewals before they lapse) - whether the certificate is valid right now - whether the site is even reachable ### Example output ```json { "subdomain": "api.github.com", "domain": "github.com", "seenAsWildcard": false, "certIssuer": "DigiCert Inc", "certValidFrom": "2026-02-01", "certValidTo": "2027-02-28", "liveReachable": true, "liveIssuer": "Sectigo Limited", "liveValidFrom": "2026-03-15", "liveValidTo": "2026-09-30", "liveDaysToExpiry": 79, "liveValidNow": true, "liveSanCount": 2 } ```` ### Pricing **$0.002 per subdomain.** The **first 2 rows of every run are free**. A typical domain returns tens to a few hundred subdomains, so most runs cost a few cents to under a dollar. Paid attack-surface and certificate-monitoring tools start at $50 to $100+ per month. ### How to run it via API ```bash curl -X POST "https://api.apify.com/v2/acts/scrapemint~ssl-subdomain-finder/run-sync-get-dataset-items?token=YOUR_TOKEN" \ -H "Content-Type: application/json" \ -d '{"domains": ["github.com"], "checkLiveCert": true}' ``` Run it on a schedule to catch certificates before they expire and spot new subdomains as they appear. ### Frequently asked questions **Where do the subdomains come from?** Public certificate transparency logs (SSLMate certspotter, with crt.sh as backup). Every time a site gets an SSL certificate it is logged publicly, which reveals the subdomain names. No scanning or guessing. **Will it find every subdomain?** It finds those that have had their own SSL certificate, which is most of them on modern sites. The keyless data covers the most recent certificates per domain, so very large domains show their newest subdomains first. Subdomains that never used HTTPS will not appear. **Is this legal?** Yes. It reads public certificate records and public certificates, the same data any browser sees. It does not log in or attack anything. ### More tools from Scrapemint - [Domain WHOIS & Age Checker](https://apify.com/scrapemint/domain-whois-checker): age, registrar and owner info for any domain. - [Website Tech Stack Detector](https://apify.com/scrapemint/website-tech-stack-detector): what a website is built with. - [Website Change Monitor](https://apify.com/scrapemint/website-change-monitor): alerts when any web page changes. # Actor input Schema ## `domains` (type: `array`): One domain per line, e.g. github.com. No http:// needed. You can add several. ## `checkLiveCert` (type: `boolean`): For each subdomain, connect over HTTPS and read its current SSL certificate (issuer, expiry, days left, whether it is valid right now). Turn off for a faster, records-only run. ## `maxRows` (type: `integer`): Cap on subdomains returned per run. Controls total cost. First 2 rows per run are free. ## Actor input object example ```json { "domains": [ "github.com" ], "checkLiveCert": true, "maxRows": 300 } ``` # API You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup. ## JavaScript example ```javascript import { ApifyClient } from 'apify-client'; // Initialize the ApifyClient with your Apify API token // Replace the '' with your token const client = new ApifyClient({ token: '', }); // Prepare Actor input const input = { "domains": [ "github.com" ] }; // Run the Actor and wait for it to finish const run = await client.actor("scrapemint/ssl-subdomain-finder").call(input); // Fetch and print Actor results from the run's dataset (if any) console.log('Results from dataset'); console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`); const { items } = await client.dataset(run.defaultDatasetId).listItems(); items.forEach((item) => { console.dir(item); }); // 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs ``` ## Python example ```python from apify_client import ApifyClient # Initialize the ApifyClient with your Apify API token # Replace '' with your token. client = ApifyClient("") # Prepare the Actor input run_input = { "domains": ["github.com"] } # Run the Actor and wait for it to finish run = client.actor("scrapemint/ssl-subdomain-finder").call(run_input=run_input) # Fetch and print Actor results from the run's dataset (if there are any) print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"]) for item in client.dataset(run["defaultDatasetId"]).iterate_items(): print(item) # 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start ``` ## CLI example ```bash echo '{ "domains": [ "github.com" ] }' | apify call scrapemint/ssl-subdomain-finder --silent --output-dataset ``` ## MCP server setup ```json { "mcpServers": { "apify": { "command": "npx", "args": [ "mcp-remote", "https://mcp.apify.com/?tools=scrapemint/ssl-subdomain-finder", "--header", "Authorization: Bearer " ] } } } ``` ## OpenAPI specification ```json { "openapi": "3.0.1", "info": { "title": "SSL Certificate & Subdomain Finder for Any Website", "description": "Find all the subdomains of any website and check its SSL certificates. Paste a domain and get every subdomain seen in public certificate records, plus the certificate issuer, valid dates and days until expiry. Great for security checks and finding forgotten sites. No API key needed.", "version": "0.1", "x-build-id": "BRSFFoqEE9kv0UAid" }, "servers": [ { "url": "https://api.apify.com/v2" } ], "paths": { "/acts/scrapemint~ssl-subdomain-finder/run-sync-get-dataset-items": { "post": { "operationId": "run-sync-get-dataset-items-scrapemint-ssl-subdomain-finder", "x-openai-isConsequential": false, "summary": "Executes an Actor, waits for its completion, and returns Actor's dataset items in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK" } } } }, "/acts/scrapemint~ssl-subdomain-finder/runs": { "post": { "operationId": "runs-sync-scrapemint-ssl-subdomain-finder", "x-openai-isConsequential": false, "summary": "Executes an Actor and returns information about the initiated run in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/runsResponseSchema" } } } } } } }, "/acts/scrapemint~ssl-subdomain-finder/run-sync": { "post": { "operationId": "run-sync-scrapemint-ssl-subdomain-finder", "x-openai-isConsequential": false, "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK" } } } } }, "components": { "schemas": { "inputSchema": { "type": "object", "properties": { "domains": { "title": "Domains", "type": "array", "description": "One domain per line, e.g. github.com. No http:// needed. You can add several.", "default": [], "items": { "type": "string" } }, "checkLiveCert": { "title": "Check the live certificate", "type": "boolean", "description": "For each subdomain, connect over HTTPS and read its current SSL certificate (issuer, expiry, days left, whether it is valid right now). Turn off for a faster, records-only run.", "default": true }, "maxRows": { "title": "Max rows per run", "minimum": 1, "maximum": 5000, "type": "integer", "description": "Cap on subdomains returned per run. Controls total cost. First 2 rows per run are free.", "default": 300 } } }, "runsResponseSchema": { "type": "object", "properties": { "data": { "type": "object", "properties": { "id": { "type": "string" }, "actId": { "type": "string" }, "userId": { "type": "string" }, "startedAt": { "type": "string", "format": "date-time", "example": "2025-01-08T00:00:00.000Z" }, "finishedAt": { "type": "string", "format": "date-time", "example": "2025-01-08T00:00:00.000Z" }, "status": { "type": "string", "example": "READY" }, "meta": { "type": "object", "properties": { "origin": { "type": "string", "example": "API" }, "userAgent": { "type": "string" } } }, "stats": { "type": "object", "properties": { "inputBodyLen": { "type": "integer", "example": 2000 }, "rebootCount": { "type": "integer", "example": 0 }, "restartCount": { "type": "integer", "example": 0 }, "resurrectCount": { "type": "integer", "example": 0 }, "computeUnits": { "type": "integer", "example": 0 } } }, "options": { "type": "object", "properties": { "build": { "type": "string", "example": "latest" }, "timeoutSecs": { "type": "integer", "example": 300 }, "memoryMbytes": { "type": "integer", "example": 1024 }, "diskMbytes": { "type": "integer", "example": 2048 } } }, "buildId": { "type": "string" }, "defaultKeyValueStoreId": { "type": "string" }, "defaultDatasetId": { "type": "string" }, "defaultRequestQueueId": { "type": "string" }, "buildNumber": { "type": "string", "example": "1.0.0" }, "containerUrl": { "type": "string" }, "usage": { "type": "object", "properties": { "ACTOR_COMPUTE_UNITS": { "type": "integer", "example": 0 }, "DATASET_READS": { "type": "integer", "example": 0 }, "DATASET_WRITES": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_READS": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_WRITES": { "type": "integer", "example": 1 }, "KEY_VALUE_STORE_LISTS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_READS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_WRITES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_INTERNAL_GBYTES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_EXTERNAL_GBYTES": { "type": "integer", "example": 0 }, "PROXY_RESIDENTIAL_TRANSFER_GBYTES": { "type": "integer", "example": 0 }, "PROXY_SERPS": { "type": "integer", "example": 0 } } }, "usageTotalUsd": { "type": "number", "example": 0.00005 }, "usageUsd": { "type": "object", "properties": { "ACTOR_COMPUTE_UNITS": { "type": "integer", "example": 0 }, "DATASET_READS": { "type": "integer", "example": 0 }, "DATASET_WRITES": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_READS": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_WRITES": { "type": "number", "example": 0.00005 }, "KEY_VALUE_STORE_LISTS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_READS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_WRITES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_INTERNAL_GBYTES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_EXTERNAL_GBYTES": { "type": "integer", "example": 0 }, "PROXY_RESIDENTIAL_TRANSFER_GBYTES": { "type": "integer", "example": 0 }, "PROXY_SERPS": { "type": "integer", "example": 0 } } } } } } } } } } ```