IP WHOIS Lookup
Discover ownership, network allocation, abuse contacts, and registration information for IPv4 addresses.
What Is IP WHOIS?
IP WHOIS lookup returns registration data for an IPv4 address — network name, CIDR range, country, status, and abuse contacts.
VSPIC queries RDAP (rdap lookup) for structured ip ownership lookup results you can use in abuse tickets.
How to Use This Tool
- Enter a public IPv4 address (e.g. 8.8.8.8).
- Click IP WHOIS Lookup to query RDAP registries.
- Review network name, CIDR, country, and organization fields.
- Note the abuse contact email for reporting misuse.
- Open the RDAP URL for authoritative registry details if needed.
What Information Does IP WHOIS Provide?
When available from RDAP, results include:
- Network name
- Registered network or handle for the IP block.
- CIDR
- Allocated prefix containing the address.
- Country
- Country associated with the registration.
- Organization
- Holder or registrant organization.
- Dates
- Registration and last-changed timestamps when published.
- Abuse contact
- Email for reporting spam or attacks.
- RDAP URL
- Link to authoritative registry data.
- Status
- Allocation or operational status values.
RDAP vs WHOIS
| RDAP | Legacy WHOIS |
|---|---|
| JSON with stable fields | Unstructured text |
| Preferred for IP today | Still used for some domains |
| Machine-readable links | Varies by RIR format |
IP WHOIS vs IP Geolocation
| IP WHOIS | IP Geolocation |
|---|---|
| Registry holder, CIDR, abuse contacts | Country, city, map coordinates |
| RDAP allocation records | Commercial geo databases |
| Best for abuse reporting | Best for map and city-level context |
| Pairs with whois ip geolocation workflows | Use IP Lookup for both in one pass |
IP Allocation Explained
RIRs (ARIN, RIPE, APNIC, etc.) allocate IP blocks to ISPs and enterprises. Individual IPs belong to a parent CIDR in ip registration lookup data.
Reassignment may lag — pair with live IP lookup for current routing context.
Understanding ASN and Network Blocks
ASN identifies the autonomous system; CIDR shows the address range. Together they explain network owner lookup for firewalls and BGP.
Use ASN Lookup when you have only AS numbers from logs.
Finding Abuse Contacts
The abuse email field is the correct channel for compromised host reports — not the end user behind NAT.
Include timestamps, logs, and timezone when opening tickets.
IP Ownership Research
Security teams chain IP WHOIS → reverse DNS → blacklist check for phishing infrastructure.
Lawful investigations should document RDAP snapshots with timestamps.
Common Use Cases
- Abuse reporting for spam and scanning.
- Verifying cloud provider netblocks.
- Due diligence on B2B API partners.
- Correlating firewall alerts with holders.
References
Disclaimer
RDAP data is for network administration and lawful abuse reporting. Misuse of contact data violates provider policies and may violate law.
Frequently Asked Questions
IP WHOIS (now often RDAP) shows which organization holds an IP block, allocation dates, and abuse contacts for reporting misuse.
No. Domain WHOIS covers registrar data for names. IP WHOIS covers network allocations from Regional Internet Registries.
Use the abuse email or contact from IP WHOIS results when reporting spam, scanning, or attacks from an IP.
RDAP is structured JSON with consistent fields; many registries replaced legacy WHOIS text for IP data.
No. It shows network operator contacts, not the physical location of an individual user behind NAT.
Next step for ip whois lookup
Continue with ip lookup on VSPIC.
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