Reverse IP Lookup

Take an IP and try to look for the domain/host associated with it.

Tool: IP Resolver
Type: DNS Lookup

Reverse IP Lookup

Lookup IP Address
Enter IPv4 or IPv6 address
Key Features
  • IPv4 and IPv6 support
  • Instant hostname resolution
  • Multiple reverse lookups
  • One-click copy results
  • No registration required

How Reverse IP Lookup Works

1
Enter IP

Input IP address

2
Query DNS

Reverse DNS lookup

3
Resolve Hostname

Get domain name

4
Display Results

View information

IP Address Formats

Format Example Description Status
IPv4 8.8.8.8 32-bit address format (4 octets) Supported
IPv6 2001:4860:4860::8888 128-bit address format (8 groups) Supported
IPv6 Full 2001:4860:4860:0000:0000:0000:0000:8888 Full 128-bit notation Supported
Compressed IPv6 ::1 Loopback address (localhost) Supported

Perfect For

Security Analysis

Identify hosting providers and server ownership for suspicious IPs and security investigations.

Network Administration

Manage and verify network devices, servers, and host configurations across your infrastructure.

Development & Debugging

Troubleshoot server connectivity issues and verify DNS configurations in development environments.

Geolocation Research

Identify server locations and hosting providers for geolocation and business intelligence.

Why Choose Our Tool?

⚡
Instant Results

Real-time DNS resolution

🌐
IPv4 & IPv6

Both formats supported

🔄
Unlimited Lookups

No limits on queries

📋
Easy Copy

One-click copying

📱
Mobile Friendly

Works everywhere

🆓
100% Free

No registration

Rate Your Experience – Let Us Know How We Did!

Your feedback would allow us to improve the platform and provide a better experience.

😍

Liked it? Give it a rating:

0 of 0 ratings

4618+ people loved our tools

Understanding Reverse IP Lookup

What is Reverse IP Lookup?

Reverse IP lookup, also known as reverse DNS lookup (rDNS), is a DNS query that takes an IP address and returns the hostname associated with it. Unlike forward DNS lookup which translates domain names to IP addresses, reverse lookup performs the opposite function. This is a fundamental network utility used for security, administration, and troubleshooting purposes.

How Reverse DNS Works

  • IP Inversion: The IP address is reversed and converted to a special domain format (.arpa)
  • DNS Query: A query is sent to DNS servers for this special domain
  • PTR Record: DNS responds with a Pointer (PTR) record containing the hostname
  • Hostname Return: The associated hostname is returned to the requester

IPv4 vs IPv6 Reverse Lookup

  • IPv4: Uses in-addr.arpa domain for reverse lookup (e.g., 8.8.8.8 becomes 8.8.8.8.in-addr.arpa)
  • IPv6: Uses ip6.arpa domain for reverse lookup (more complex due to 128-bit addresses)
  • Compatibility: Both formats are supported by modern DNS systems
  • Usage: IPv6 becoming more important as IPv4 addresses become scarce

Common Applications

  • Email Authentication: Verify sender domains to prevent spam and phishing
  • Security Investigation: Identify sources of suspicious network traffic
  • Network Administration: Verify server configurations and DNS settings
  • Geolocation: Determine server locations and hosting providers
  • Server Diagnosis: Troubleshoot connectivity and DNS resolution issues
  • Logging and Auditing: Add hostname information to IP-based log entries

Limitations and Considerations

Reverse DNS lookups may not always return results if PTR records are not properly configured. Some ISPs or network administrators don't set up reverse DNS, resulting in failed lookups. Additionally, multiple IP addresses can resolve to different hostnames, and a single hostname may correspond to multiple IP addresses. Performance can also vary depending on DNS server responsiveness and network conditions.

Pro Tip: Use reverse IP lookups as part of a comprehensive security strategy. Combine results with additional research tools like WHOIS lookups, geolocation databases, and threat intelligence platforms for better insights.

Frequently Asked Questions

Forward lookup translates domain names to IP addresses (e.g., google.com → 142.250.x.x). Reverse lookup does the opposite, translating IP addresses to hostnames.
Reverse lookups fail if PTR records are not configured, if the IP owner hasn't set up reverse DNS, or if DNS servers are unreachable or misconfigured.
Yes! Reverse DNS lookup is commonly used in security investigations to identify suspicious servers, verify email sender domains, and conduct network forensics.
PTR (Pointer) records are DNS records that map IP addresses to hostnames. They're essential for reverse DNS lookups and are configured in the reverse DNS zone.
Yes! This tool supports both IPv4 and IPv6 reverse lookups. IPv4 uses in-addr.arpa while IPv6 uses ip6.arpa domain.
Speed depends on DNS server responsiveness and network conditions. Most lookups complete within milliseconds to a few seconds.
Yes! Contact your ISP or hosting provider to configure PTR records for your IP addresses. You'll need access to your DNS zone settings.
Yes! Our Reverse IP Lookup tool is completely free with unlimited lookups and no registration required.

Popular tools