https://db-ip.com/asn/
Up-to-Date Autonomous System Numbers Database | DB-IP
For an extensive list of ASNs, you can take a look at our complete database here. We have hundreds of thousands of ASNs listed, and continue to update the...
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https://www.iana.org/assignments/as-numbers/as-numbers.xhtml
Autonomous System (AS) Numbers
autonomous systemas numbers