Some general info about IP at the global scale:
IP addresses are assigned by regional internet registries[1] (RIR) like ARIN (for North America) and APNIC (for Asia-Pacific regions). Addresses are assigned in blocks like the /22 mentioned in the article.
These prefixes are then associated with Autonomous Systems, which participate in routing. You can view routing information on looking glass servers[2] or by using a tool like Hurricane Electric's BGP toolkit: http://bgp.he.net .
For example, here's the data for Cloudflare's AS (which serves HN): http://bgp.he.net/AS13335 . You can look at the prefixes it serves and who they peer with.
[1] https://en.wikipedia.org/wiki/Regional_Internet_registry