How to use custom ISP database in geoip?

Elastic Stack Logstash
1

The ISP database from MAXMIND is only suitable for USA ISP, and not correct out of USA

The ISP name is about 95% accurate in the US. Outside the US, accuracy ranges from 50% to 80%, depending on the country. The data is generally more accurate for countries with more Internet users.

I got a csv formatted isp data suitable for my region.
How can I use it?

Thank you for help!

2

You would need to change it to the same format as the maxmind one.

3

Thank you, @warkolm

But the filter seems not support csv. I saw that all the samples were binary .dat

geoip {
      database => "/etc/logstash/geoip/GeoIPASNum.dat"
      source => "src_ip"
    }

I've found some tool for transforming csv to maxmind dat. mmutils

But my csv file contains characters out range of ascii, and then result in unreadable

"fields": {
          "isp.isp": [
            "移动"
          ]
        }