A quick analysis of internet latency form Singapore to the rest of the world.
## Scanning the internet To scan the IPv4 internet, I used the tool [`masscan`](https://github.com/robertdavidgraham/masscan) by security researcher Robert Graham. He has extensively made use of `masscan` in the security research he does. It provides latency measurements up to the millisecond. I wrote a configuration file to run `masscan` on the entire internet with the included exclusion list, and scan the top 5 open ports according to [speedguide.net](https://www.speedguide.net/ports_common.php). It is stored as `scan.conf`. I started the scan with: ``` masscan -c scan.conf ``` This produces the output file `scan.bin`. ## Categorising readings by country To associate an IP address with a country, a geolocation lookup database must be used. I used two sources of geolocation databases; Maxmind's GeoLite2, and Webnet77's IPToCountry; to test the accuracy of either database. ``` ```