Why can’t I find a particular IP address in your GeoIP2 CSV database?

In our GeoIP2 CSV Blocks files, IPv4 and IPv6 addresses are not listed individually, but are instead consolidated into networks in CIDR format–for example, “” for IPv4, or “2001:4b0::/80” for IPv6. This notation by network is essential to maintaining manageable file sizes; however, as a result, you would not be able to search directly for the vast majority of individual IPs.

If you wish to convert the CIDR format to start/end dotted-decimal IPs or to start/end integer IPs, we provide a conversion utility tool here.