Every network packet travels through ISP backbone routers before reaching the world. This page diagnoses which ISP owns your IP and the Autonomous System (AS) number for that network.
ISPs are companies that connect users to the internet for a monthly fee. Major Korean providers include KT (AS9644), SK Broadband (AS9318), and LG U+ (AS3786), along with cable operators offering budget plans. They manage submarine cables and large router centers that link the global internet.
The internet is not one network but a federation of autonomous systems (AS), each with a unique ASN. Carriers and large companies (Naver, Google, etc.) operate their own ASNs and exchange routing information via BGP (Border Gateway Protocol) to find optimal paths.
Security systems monitor ISP and organization fields to protect valuable data. Normal users should arrive from residential ISP IPs like KT or SK Telecom. Logins from cloud data centers such as AWS, Google Cloud, or Azure suggest macros, crawlers, or malicious scripts, triggering automated defenses like reCAPTCHA.