IP WHOIS Lookup
Enter an IP address to see its WHOIS registration data including owner, ISP, and network range.
Server processing — your query is handled securely on our servers.
How to use IP WHOIS Lookup
The IP WHOIS tool looks up the registration details of an IP address: which organisation owns the address block, the regional internet registry that allocated it, the network range it belongs to, and the abuse contact for reporting problems. Unlike domain WHOIS, which describes a name, IP WHOIS describes the network itself, making it the right tool for identifying who is responsible for an address. Use it to find the hosting provider behind a server, to locate the abuse contact for an address attacking you, or to understand the size and owner of a network range.
- Enter the IP address you want to research.
- Click Lookup to query the regional internet registry.
- Read the owning organisation and network range.
- Note the registry (ARIN, RIPE, APNIC, etc.) responsible.
- Use the abuse contact to report malicious activity.
What IP WHOIS reveals
Every public IP belongs to a block allocated by one of the five regional internet registries to an organisation — a hosting company, an ISP, a university or a business. IP WHOIS returns that organisation, the start and end of the allocated range, and usually an abuse contact intended for reporting spam or attacks originating from the block. This is how network operators trace the responsible party for any address, and how you find out, for instance, that a suspicious IP in your logs belongs to a particular cloud provider.
| Registry | Region |
|---|---|
| ARIN | North America |
| RIPE NCC | Europe, Middle East, Central Asia |
| APNIC | Asia-Pacific |
| LACNIC | Latin America |
| AFRINIC | Africa |
Using the abuse contact effectively
When an IP is the source of spam, brute-force attempts or other abuse, the WHOIS abuse contact is the proper channel to report it — the network owner can act where you cannot. A good report includes the offending IP, timestamps with the time zone, and concise log evidence. Bear in mind that the address you see may be a shared host or a compromised machine rather than the attacker’s own, so reporting to the network owner, who can investigate internally, is more effective than trying to identify an individual yourself.
Glossary
- IP WHOIS
- A lookup of which organisation owns and is responsible for an IP block.
- Regional internet registry
- One of five bodies allocating IP ranges by region.
- Abuse contact
- The address for reporting malicious activity from a network.
- Network range
- The block of addresses allocated together to one organisation.
- Allocation
- The assignment of an IP range from a registry to an organisation.
Related reading
Frequently Asked Questions
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Why use IP WHOIS Lookup?
- Real-time DNS lookups using live resolver queries
- Supports IPv4 and IPv6 addresses
- No software to install — runs entirely in the browser
- Results include TTL values and record priority
Common use cases
- Verify DNS propagation after updating nameservers
- Check MX records when troubleshooting email delivery
- Look up SPF/DKIM/DMARC records for email security audits
- Test whether a SSL certificate is valid and up to date
- Find the IP address behind a domain name
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