---
title: "Subdomain Finder - Free lookup | FirstSales"
description: "The Subdomain Finder discovers all subdomains for a domain including common and hidden subdomains. Complete domain mapping."
canonical: "https://firstsales.io/tools/subdomain-finder/"
---

100% Free • No SignupDomain & DNS Toolslookup

# Subdomain Finder

Discover all subdomains for a given domain including hidden ones. Works instantly without signup.

Instant Results

No Signup

[Home](/)/[Tools](/tools/)/Subdomain Finder

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Subdomain Finder

Discover Subdomains

Enter a domain to find subdomains from Certificate Transparency logs (crt.sh).

[Stop doing this by hand. FirstSales runs your domain & dns tools on autopilot, 24/7.Start your $1 trial](https://app.firstsales.io)

## Key Features

Subdomain discovery

DNS enumeration

Hidden subdomains

Export results

Monitoring

## Use Cases

1

Domain audit

2

Security assessment

3

Asset inventory

4

Competitor analysis

Tool Info

Typelookup

Free

Yes

Signup

Not Required

Related Tools

[DNS Record LookupLookup all DNS record types (A, AAAA, CNAME, MX, NS, TXT, SOA) for any domain](/tools/dns-record-lookup/)[Domain Age CheckerCheck how old a domain is and when it was first registered](/tools/domain-age-checker/)[Domain Expiration CheckerCheck when a domain expires and get renewal reminders for your domains](/tools/domain-expiration-checker/)[WHOIS LookupGet WHOIS registration information for any domain including owner, registrar, and contacts](/tools/whois-lookup/)[Sender Score LookupCheck your email sending IP's sender score (0-100) and compare against industry benchmarks](/tools/sender-score-lookup/)[MX Record LookupLook up MX records for any domain to verify mail server configuration and priority settings](/tools/mx-record-lookup/)

Start your $1 trial

Automated cold email sequences

Smart deliverability tools

Built-in analytics

[Start your $1 trial ](https://app.firstsales.io/)

## About Subdomain Finder

The Subdomain Finder discovers all subdomains for a domain including common and hidden subdomains. Complete domain mapping.

## Automate Your Domain & DNS Tools

This free tool is great for quick checks. FirstSales automates your entire domain & dns tools workflow with AI-powered personalization and 87% inbox placement.

[Start your $1 trial](https://app.firstsales.io)

Setup in 8 minutes • Cancel anytime

## FAQs

Your questions answered

Can't find what you're looking for? Contact our [customer support team](mailto:support@firstsales.io)

### General

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### Deliverability

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Can't find what you're looking for? Contact our [customer support team](mailto:support@firstsales.io)