Looking up an IP address using a RIR

If you wish to determine the country of origin for an IP address, you can look up IP addresses using the websites of regional internet registries (RIRs). Blocks of IP addresses are assigned to companies, government agencies, Internet Service Providers (ISPs), etc. by a RIR. There are five RIRs that allocate IP address blocks for various parts of the world. For the United States and Canada, parts of the Caribbean region, and Antarctica, the RIR is the American Reistry for Internet Numbers. I usually start there. I can go to www.arin.net and put the IP address in the "SEARCH Whois" field at the top, right-hand corner of the web page. If ARIN is responsible for allocating the block of IP addresses to which the one I'm interested in belongs, then its site will reveal which organization, company, or government agency has been allocated the block of addresses to which the relevant address belongs. If it isn't the relevant RIR, it will inform me which RIR is the relevant one.

E.g., if I'm interested in obtaining information on the IP address, I can put in that address and see that the APNIC RIR is responsible for the allocation of the IP address. APNIC (Asia Pacific Network Information Centre) is responsible for allocating IP addresses for the Asia-Pacific region. So I can then visit the APNIC web site at www.apnic.net and perform a WHOIS search there on the IP address, which shows me the following information on the IP address:

inetnum: -
descr:CHINANET Guangdong province network
descr:Data Communication Division
descr:China Telecom
remarks:service provider
remarks: -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
remarks:To report network abuse, please contact the IRT
remarks: For troubleshooting, please contact tech-c and admin-c
remarks:For assistance, please contact the APNIC Helpdesk



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