In more detail
Internet providers, cloud companies and large organisations have ASNs, such as AS15169 (Google) and AS13335 (Cloudflare). Looking up an IP address's ASN tells you which organisation announces that address range.
Glossary
Networking
ASN (autonomous system number)
An ASN is a unique number assigned to a network, or group of networks, that is run under a single routing policy on the internet.
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See also
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Glossary
IP address
An IP address is the number that identifies a device on a network so that data can be sent to it.
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Glossary
CIDR
CIDR (Classless Inter-Domain Routing) is the notation that writes an IP network as an address plus a prefix length, such as 192.168.1.0/24.