IP Whois Checker
Look up network registration data for any IP address via ARIN RDAP. Shows network name, organisation, CIDR range, RIR and registration date.
✅ Free 📡 ARIN RDAP 📋 Raw JSON 🔒 Private
⚡ Live API lookup — results are fetched in real time from public DNS/WHOIS APIs. Some data may be limited by API rate limits or GDPR redaction.
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IP Whois Checker📡
ARIN RDAP
Uses ARIN's RDAP registry for authoritative network registration data.
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Network Range
Shows CIDR block, start/end addresses and network type.
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Raw JSON
Full RDAP response available for download and inspection.
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Private
Queries go directly from your browser to ARIN RDAP.
⭐ User Reviews
A
Alex T.
Yesterday
⭐⭐⭐⭐⭐
Fast and accurate. Got the data I needed in under 3 seconds. Clean interface with no ads cluttering the results.
Network ToolsS
Sara K.
2 days ago
⭐⭐⭐⭐⭐
I use this daily for domain research. The structured output with copy buttons saves me tons of time compared to raw whois terminals.
Network ToolsD
Dan M.
1 week ago
⭐⭐⭐⭐⭐
The results are consistently accurate and the copy-per-field feature is incredibly useful for building reports.
Network ToolsL
Laura B.
2 weeks ago
⭐⭐⭐⭐⭐
Finally a tool that gives clean, readable output. The related tools panel lets me jump from one check to the next without losing my query.
Network Tools📖 How to Use
1
Enter IP address
Type any IPv4 address (IPv6 support varies by RIR).
2
Click Whois
ARIN RDAP returns network registration data.
3
Read network info
Organisation, CIDR range, country and registration date.
4
Copy raw data
Click Copy Raw to get the full JSON response.
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❓ FAQ
What is IP Whois?+
IP Whois looks up the network registration data for an IP address — who owns the IP range, their organisation, country, and which Regional Internet Registry (RIR) manages the allocation.
What are the Regional Internet Registries (RIRs)?+
Five RIRs manage IP allocation by region: ARIN (North America), RIPE NCC (Europe/Middle East), APNIC (Asia-Pacific), LACNIC (Latin America), AFRINIC (Africa). This tool uses ARIN by default and may redirect to others.
What is a CIDR block?+
CIDR (Classless Inter-Domain Routing) notation like 8.8.8.0/24 represents a range of IP addresses. /24 means 256 addresses. CIDR blocks are how IP address ranges are allocated to organisations.
How is IP Whois different from domain Whois?+
Domain Whois shows who registered a domain name. IP Whois shows who owns an IP address range. They are separate systems — a domain's IP might be owned by a cloud provider even if the domain is registered by someone else.
Why does ARIN RDAP sometimes fail for non-US IPs?+
ARIN primarily covers North American IPs. For European IPs, use RIPE (ripe.net). For Asia-Pacific, use APNIC (apnic.net). The error message guides you to the appropriate RIR for your IP.