Self-contained IP to country lookup
IP 2 Country
IP 2 Country provides a current lookup table to geolocate IP address to
the countries in which they are most probably located. Distributed as a
stand-alone NPM module with no dependencies, the list is created at publication
time. This mapping is generated through the use of two databases:
- autnums Provides a
textual descriptiosn of each registered ASN, including the country to which
that ASN is registered.
- routeviews.org orginas Provides a
current list of BGP announcements, allowing us to understand which ASNs
are announcing ownership of which IP prefixes.
var ip2country = ;
var country = ;
There are several related lookup tables for IP addresses that may be of use.
While not published for direct consumption, this library contains the tools
to generate those tables for your process. This functionality is accessed
getGenericMap() function in build.js. In particular, the
following knobs are exposed when generating the lookup table:
- compress - Should the table be de-duplicated? When false the table will be
faster to generate but slower to look up.
- toCountry - Should the ip-ASN table be joined with an ASN-country table?
When false an IP-ASN lookup table will be generated.
- when - At what point should the table be generated? If set, the full RIB -
routing information base - from the given time will be loaded and an
originas extracted from that file (see historicBGPData.js).
- nocache - Should a new originas be downloaded even if one already exists
on disk? (defaults to false).