What does AS Name and AS Number mean on the cloudflare DNS check page (https://1.1.1.1/help)? i.e. what does "AS" stand for?
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"AS" stands for "Autonomous System".
These are large scale networks that provide routing information to other large scale networks. Autonomous systems communicate with each other using the Border Gateway Protocol (BGP).
Related interesting link: https://www.cloudflare.com/en-gb/learning/security/glossary/what-is-bgp/
The names and numbers can be looked up here: https://asrank.caida.org/
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