Nikolai Tschacher

icon indicating a website link https://incolumitas.com/ icon indicating an email [email protected]

icon company Germany/Berlin icon location Berlin icon location I am a computer scientist (M. Sc.) and IT security specialist. Mostly working with JavaScript (Node.js) and Python. Creator and developer of ipapi.is

Results 44 comments of Nikolai Tschacher

Interesting fingerprinting .. but how to counter back the fingerprinting by server

As of https://floatingoctothorpe.uk/2018/detecting-uptime-from-tcp-timestamps.html, most modern Linux Kernels add a random offset, which effectively prevents getting uptime information: > On Linux the TCP timestamp feature can be controlled with the net.ipv4.tcp_timestamp...

Interesting fingerprinting .. but how to counter back the fingerprinting by server

You know what? You always answer immediately, I will now finally put some effort into implementing the uptime detection lol :)

Interesting fingerprinting .. but how to counter back the fingerprinting by server

Hey there I now implemented the TCP Timestamp Uptime detection method. For example, this is an Android client visiting my API: ```json "xxx": { "avgScoreOsClass": { "Android": "avg=8.63, N=230", "Linux":...

Add ipinfo enrichment

Hey, If you want a similarly accurate IP API but with a much larger free tier plan, consider https://ipapi.is/ The data quality is the same as ipinfo.io, but with much...