IP-Whois-opzoeking

Over deze tool

A whois lookup reveals who owns an IP address and which organization operates the network it belongs to. Every IPv4 and IPv6 address on the public internet is allocated through one of five Regional Internet Registries — ARIN, RIPE, APNIC, LACNIC, and AFRINIC — and they maintain public databases of these allocations.

Our tool queries the correct registry automatically based on the address you enter, then parses the response into structured data: organization name, ASN (autonomous system number), CIDR range, country, abuse contact, and registration dates. The raw registry response is also available if you need the unprocessed output.

When to use this tool

• Investigating suspicious traffic. Identify which organization owns an IP that appeared in your server logs.
• Reporting abuse. Find the correct abuse contact to report spam, brute-force attempts, or DDoS traffic.
• Geolocation verification. Cross-reference an IP's declared country with its registry allocation.
• Network planning. Check ASN ownership when evaluating transit providers or peering relationships.

How whois data stays accurate

Registries require IP holders to keep contact details current, but enforcement varies. Smaller allocations under a corporate umbrella may show the parent organization rather than the actual operator. For the most accurate picture, combine whois data with rDNS lookups and ASN routing information — all three perspectives together tell a clearer story than any single one.