This webpage is a completewhois side-project that deals with investigations of hijacked ip blocks. If you do not know what hijacked ips or even if you do know but are visiting this webpage for a first time, we strongly advise you read "Hijacked IPs Q/A" which explains in detail what hijacked IPs are and what can be done about it. 

We also maintain separate list of "hijackers" on this page - this has the same ip blocks listed here but grouped by hijackers and it is a recommended webpage to see after this one for those who are on this website for the first time. If you are searching for particular information you can also use our search engine (which includes ability to search in all hijacked ip block investigation evidence files)

If you believe particular large ip block (directly allocated or assigned by RIR) may be hijacked and is not  used by proper company currently, you can report it on this form (also use the same form if you have any new information regarding blocks already listed below, but if you directly represent the company listed as having hijacked or used ip block below and it was never hijacked, and its use and reported whois  changes were done per your request, then use the disputes procedures to challenge this listing)

Regarding various status codes and how we decide if particular ip block is listed here or not, please see this "status code" page.
Available here is text-only file that includes ip blocks from below with active, possible, hijacking-danger status, and we also provide ability to check if ip is in that above file by dns at hijacked.dnsiplists.completewhois.com, for more information about it, please see this page

Separately in this file you can find exactly which ip blocks from the ones in the list below are actively used on the net right now (updated daily)