Erlang OTP application for handling MaxMind(tm) Geoip2 (.mmdb) files.

This is a forked branch of altenmueller/geodata2, which uses a shared ETS table to hold the database state rather than a cluster of workers.
This was done to improve performance.

Features:

• Supports all types (hopefully) of bases in .mmdb format, both IPv4 and IPv6 ones.
• Safe from binary reference leakage, binary parts are getting copied.
• R18 compatible.
• OTP22 compatible.
• Uses rebar3.

The app accepts IPs in {B3:8, B2:8, B1:8, B0:8}, {W7:16, W6:16, W5:16, W4:16, W3:16, W2:16, W1:16, W0:16}, string, binary string, and big-endian dword formats.

Example:

Download and unzip GeoLite2-City.mmdb from MaxMind site and put the databases in the priv/ dir.

1> geodata2:start().
ok

3> geodata2:lookup({94, 75, 242, 11}).
{ok,[{<<"registered_country">>,
      [{<<"names">>,
        [{<<"zh-CN">>,<<232,141,183,229,133,176>>},
         {<<"ru">>,
          <<208,157,208,184,208,180,208,181,209,128,208,187,208,
            176,208,189,208,...>>},
         {<<"pt-BR">>,<<"Holanda">>},
    ...
       {<<"geoname_id">>,6255148},
       {<<"code">>,<<"EU">>}]}]}

8> geodata2:lookup({127, 0, 0, 1}).
not_found

9> geodata2:lookup({127, 0, 0, 1, 1}).
{error,format}

A MaxMind repo with a number of test bases: MaxMind-DB

This application uses some bits and pieces from egeoip