master/tools/security/pentest-recon-enum/web-dns-recon-tools.md

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# Online DNS & Subdomain Recon Tools
Collection of **web-based / online** DNS tools useful during the reconnaissance phase of penetration testing and security assessments.
These tools focus on:
- DNS record lookups and analysis
- Subdomain enumeration
- DNS propagation checking
- Delegation and DNSSEC validation
- Historical reverse DNS records
- Wildcard / testing DNS services
They complement CLI-based recon tools (see [pentest-arsenal.md](./pentest-arsenal.md)) and are ideal for quick, passive OSINT without local installation.
[↑ Back to Pentest Recon & Enum INDEX](./INDEX.md)
[↑ Back to Tools Overview](../../_INDEX.md)
<details open>
<summary>Core DNS Lookup & Investigation Tools</summary>
### Core DNS Lookup & Investigation Tools
| Name | Vendor/Webpage | GitHub Repo | Brief Description | Tags | Latest Commit | Creation Date | Stars |
|-----------------------|---------------------------------------------------------|-------------|----------------------------------------------------------------------------------|-----------------------------------------------|---------------|---------------|-------|
| ViewDNS | [viewdns.info](https://viewdns.info/) | — | Multi-tool suite offering DNS, WHOIS, reverse IP, propagation, traceroute and more. | [dns, recon, lookup, propagation, osint] | — | ~2008 | — |
| DNSLookup | [dnslookup.org](https://dnslookup.org/) | — | Advanced DNS lookup tool with detailed record parsing and visualization. | [dns, lookup, records, analysis] | — | ~2015 | — |
| DNSlytics | [dnslytics.com](https://dnslytics.com/) | — | Online DNS and IP investigation platform with historical data and maps. | [dns, investigation, intel, osint] | — | ~2016 | — |
| DNS Spy | [dnsspy.io](https://dnsspy.io/) | — | Monitors DNS configurations, detects changes, and validates settings. | [dns, monitor, validation, config] | — | ~2017 | — |
| Zonemaster | [zonemaster.iis.se](https://zonemaster.iis.se/en/) | — | Advanced DNS zone testing tool to verify configuration and best practices. | [dns, tester, zone, validation] | — | ~2013 | — |
| Leaf DNS | [leafdns.com](http://leafdns.com/) | — | Comprehensive DNS health and delegation tester. | [dns, tester, health, delegation] | — | ~2010 | — |
| intoDNS | [intodns.com](https://intodns.com/) | — | Checks DNS and mail server health, misconfigurations, and common issues. | [dns, health, checker, mail] | — | ~2009 | — |
</details>
<details>
<summary>Subdomain Enumeration & DNS Recon</summary>
### Subdomain Enumeration & DNS Recon
| Name | Vendor/Webpage | GitHub Repo | Brief Description | Tags | Latest Commit | Creation Date | Stars |
|-----------------------|---------------------------------------------------------|-------------|----------------------------------------------------------------------------------|-----------------------------------------------|---------------|---------------|-------|
| Find Subdomains Online | [findsubdomains.com](https://findsubdomains.com/) | — | Web interface to discover subdomains for security assessments and pentests. | [subdomain, enum, recon, osint] | — | ~2018 | — |
| DNSdumpster | [dnsdumpster.com](https://dnsdumpster.com/) | — | Free DNS recon & research tool; maps hosts, subdomains, and records. | [dns, recon, subdomain, dump] | — | ~2014 | — |
| DNS Table | [dnstable.com](https://dnstable.com/) | — | Searches public DNS records by domain, IP, CIDR block, or ISP. | [dns, search, records, database] | — | ~2015 | — |
</details>
<details>
<summary>DNS Propagation & Delegation Checkers</summary>
### DNS Propagation & Delegation Checkers
| Name | Vendor/Webpage | GitHub Repo | Brief Description | Tags | Latest Commit | Creation Date | Stars |
|--------------------------|--------------------------------------------------------------------|-------------|----------------------------------------------------------------------------------|-----------------------------------------------|---------------|---------------|-------|
| What's My DNS | [whatsmydns.net](https://www.whatsmydns.net/) | — | Popular global DNS propagation checker from hundreds of locations worldwide. | [propagation, checker, dns, global] | — | ~2012 | — |
| dnslookup (ceipam) | [ceipam.eu/en/dnslookup.php](https://ceipam.eu/en/dnslookup.php) | — | Excellent DNS propagation checker with detailed global views and extras. | [propagation, checker, dns, global] | — | ~2015 | — |
| BuddyDNS Delegation LAB | [buddyns.com/delegation-lab](https://www.buddyns.com/delegation-lab/) | — | Visualizes, traces, and validates domain name delegation paths. | [dns, delegation, trace, visualize] | — | ~2012 | — |
| DNS Bajaj | [zonecut.net/dns](http://www.zonecut.net/dns/) | — | Simple delegation checker showing authoritative name servers. | [dns, delegation, checker] | — | ~2005 | — |
| DNSSEC Debugger | [dnssec-debugger.verisignlabs.com](https://dnssec-debugger.verisignlabs.com/) | — | Validates DNSSEC chain, DS, and DNSKEY records. | [dnssec, validation, debugger] | — | ~2010 | — |
</details>
<details>
<summary>Historical & Wildcard DNS Services</summary>
### Historical & Wildcard DNS Services
| Name | Vendor/Webpage | GitHub Repo | Brief Description | Tags | Latest Commit | Creation Date | Stars |
|---------------|----------------------------------------------|-------------|----------------------------------------------------------------------------------|-----------------------------------------------|---------------|---------------|-------|
| PTRarchive | [ptrarchive.com](http://ptrarchive.com/) | — | Archives and searches historical reverse DNS (PTR) records. | [ptr, historical, reverse, archive] | — | ~2010 | — |
| xip.io | [xip.io](http://xip.io/) | — | Free wildcard DNS service resolving to any IP (great for local/dev testing). | [wildcard, dns, testing, local] | — | 2011 | — |
| nip.io | [nip.io](https://nip.io/) | — | Dead-simple wildcard DNS for any IP address (modern xip.io alternative). | [wildcard, dns, testing, local] | — | ~2014 | — |
</details>
<details>
<summary>Advanced / Specialized DNS Tools</summary>
### Advanced / Specialized DNS Tools
| Name | Vendor/Webpage | GitHub Repo | Brief Description | Tags | Latest Commit | Creation Date | Stars |
|-----------|--------------------------------------------------------------------------------|-------------|----------------------------------------------------------------------------------|-----------------------------------------------|---------------|---------------|-------|
| DNSGrep | [blog.erbbysam.com/.../dnsgrep](https://blog.erbbysam.com/index.php/2019/02/09/dnsgrep/) | — | Command-line style search across large public DNS datasets (web interface). | [dns, search, grep, datasets] | — | 2019 | — |
</details>