Reverse IP Lookup

Free Reverse IP Lookup Tool

The Reverse IP Lookup tool finds all domains hosted on a given IP address. It helps you uncover co-hosted websites, map attack surfaces, and investigate hosting environments quickly. Use it when auditing shared hosting, researching competitors, or troubleshooting security incidents. Try this free Reverse IP Lookup on Monkey Type for fast, reliable results.

What is Reverse IP Lookup?

Reverse IP Lookup is a network intelligence technique that reveals which domains resolve to the same IP address. Instead of starting with a domain and finding its IP, you provide an IP and discover the list of websites hosted there. This is invaluable for security analysis, digital investigations, SEO audits, and infrastructure mapping.

On Monkey Type, the Reverse IP Lookup tool aggregates data from multiple sources to show co-hosted domains, along with helpful context like ASN and hosting provider when available. This quickly answers questions like “What else is on this server?” or “Which sites share our hosting environment?”

If you’re exploring DNS relationships in more detail, pair your results with the DNS Lookup tool to inspect A, AAAA, and CNAME records for each domain you find.

Why Use Reverse IP Lookup?

• Security investigations: Identify suspicious or malicious domains sharing an IP with your site. This helps assess reputational risk and prioritize remediation on shared infrastructure. For deeper ownership checks, follow up with a WHOIS Lookup.
• Attack surface mapping: Reveal forgotten or shadow web properties that point to your server. This reduces blind spots before pentests or compliance audits, and complements a Port Scanner for service exposure.
• Hosting audits and migrations: See all domains on a shared host before moving providers. You can ensure critical sites migrate together and verify no orphaned domains remain.
• Competitor and market research: Discover related properties managed by the same team or host. This can surface microsites, campaign domains, or regional properties.
• Deliverability and SEO checks: If neighbors on a shared IP are spammy, your email reputation or search performance may suffer. Use results to justify a dedicated IP or improved hosting isolation.

How to Use Reverse IP Lookup on Monkey Type

1. Open the tool: Go to the Reverse IP Lookup page on Monkey Type.
2. Enter an input: Paste an IP address (IPv4 or IPv6). You can also enter a domain; the tool resolves its IP and then runs a reverse lookup.
3. Start the search: Click “Lookup.” Processing begins immediately using multiple data sources.
4. Review the results: See a list of domains hosted on the queried IP. Where available, you’ll also see ASN, hosting provider, and first/last seen timestamps.
5. Drill down: Select any domain to open related tools like IP Lookup or WHOIS Lookup for ownership and geolocation details.
6. Filter and export: Use filters to narrow by TLD (e.g., .com, .org) or keyword. Export results to CSV for reporting or further analysis.

Expected result: a curated list of co-hosted domains tied to the provided IP, plus optional network context to speed investigations and audits. For verification, cross-check a domain’s PTR record with Reverse DNS.

Key Features

• Accurate co-hosted domain discovery: Find domains resolving to the same IP address, including those discovered via passive DNS.
• IPv4 and IPv6 support: Query modern and legacy networks without extra steps.
• Domain input convenience: Enter a domain when you don’t know its IP; the tool resolves and reverse-maps automatically.
• Contextual network data: View ASN, provider, and timestamps when available to prioritize action.
• Filters and sorting: Quickly narrow by extension, keyword, or date to focus on the domains that matter.
• CSV export: Download results for sharing with stakeholders or importing into SIEM and audit workflows.
• One-click pivots: Jump to DNS Lookup, WHOIS Lookup, or IP Lookup for deeper analysis.

Best Practices & Tips

• Validate with multiple sources: Reverse IP datasets can be partial or time-lagged. Confirm critical findings using DNS Lookup and WHOIS.
• Check both IPv4 and IPv6: Some assets may only resolve over IPv6. Run reverse lookups for both families to avoid gaps.
• Consider CDNs and load balancers: Many unrelated domains share CDN IPs. Use results as leads, not definitive ownership proof.
• Monitor changes over time: IP-to-domain mappings shift. Re-run lookups during migrations, incident response, and quarterly audits.
• Review SSL and email footprints: Use the SSL Checker and MX Lookup to corroborate infrastructure relationships.
• Avoid overblocking: Don’t block an entire IP based solely on one bad neighbor on shared hosting; verify with Reverse DNS and WHOIS context.

Common Use Cases

• Incident response: After detecting a malicious domain, enumerate other sites on the same IP to assess collateral risk.
• Hosting provider audits: Verify whether your business-critical sites share an address with high-risk neighbors before renewing a plan.
• Migrations and consolidations: Ensure no domains are left behind when moving to new infrastructure; use a Subnet Calculator to plan allocations.
• Brand protection: Discover related or impersonating domains that might be hosted alongside your legitimate property.
• SEO and performance: Diagnose potential issues from crowded shared hosting and decide if a dedicated IP is warranted.

Frequently Asked Questions

What is a Reverse IP Lookup and how does it work?

Reverse IP Lookup finds domains that point to a specific IP address by analyzing DNS records and historical data from multiple sources. On Monkey Type, you enter an IP or domain and receive a list of co-hosted websites plus optional network context for faster decision-making.

Is the Reverse IP Lookup result list complete and real-time?

No solution can guarantee a complete, real-time list. Data depends on observation frequency and visibility. Monkey Type strives for high coverage, but you should verify critical decisions using DNS Lookup and WHOIS Lookup.

How is Reverse IP Lookup different from Reverse DNS (PTR)?

Reverse IP Lookup lists many domains sharing an IP. Reverse DNS (PTR) usually returns one hostname mapped to an IP for administrative or mail purposes. Use Reverse DNS for PTR records and Reverse IP Lookup for co-hosted domain discovery.

Can I search by domain instead of IP?

Yes. Enter a domain, and Monkey Type resolves it to an IP and then performs the Reverse IP Lookup automatically. This is useful when you don’t know the server address.

Is it legal to use Reverse IP Lookup?

Yes. The tool uses publicly available DNS information. However, do not use results to harass or unlawfully target sites. For ownership questions, consult the WHOIS Lookup tool.