- ASNs - Search for IP ranges owned by target company
	- [bgp.he.net](https://bgp.he.net)
- ARIN and RIPE - regional IP address space registries with searchable databases
	- [ARIN](https://whois.arin.net/ui/query.do)- US Region
	- [RIPE](https://apps.db.ripe.net/db-web- ui/#/fulltextsearch)- EU, Central Asia