查 IP、看线路时总会冒出”AS 几几几”，这就是 ASN。
一句话解释
ASN（Autonomous System Number，自治系统号）是给每一个独立管理的网络（运营商、机房、云厂商）分配的编号。每个 IP 都属于某个 ASN。
它能告诉你什么
- IP 是哪家的：如 AS4809=电信 CN2、AS9929=联通精品、AS13335=Cloudflare。
- 是机房还是住宅：判断 原生 / 机房 / 住宅 IP 的重要线索。
- 走什么线路：看 回程路由经过的 ASN，就能判断走的是不是精品网。
怎么查
用 ipinfo.io、bgp.he.net 或 whois 查任意 IP，就能看到它的 ASN 和归属组织。
提醒
ASN 是判断线路和 IP 类型的”钥匙”，看测评、自己排查时都用得上。
想直接挑合适的在售机型？去 库存监控 按线路 / 地区筛选。
When looking up IPs or checking network routes, you’ll constantly see “AS followed by a number” — that’s the ASN.
In a Nutshell
An ASN (Autonomous System Number) is a unique identifier assigned to each independently managed network (ISPs, data centers, cloud providers). Every IP address belongs to an ASN.
What It Tells You
- Who owns the IP: e.g., AS4809 = China Telecom CN2, AS9929 = Unicom Premium, AS13335 = Cloudflare.
- Data center vs. residential: a key clue for identifying native, data center, or residential IPs.
- What route is used: trace the ASNs in a return route to determine whether it’s using a premium network line.
How to Check
Use ipinfo.io, bgp.he.net, or a whois lookup on any IP to see its ASN and owning organization.
Reminder
The ASN is the “key” to identifying network lines and IP types — useful when reading reviews or troubleshooting on your own.
Ready to find a suitable VPS? Visit the stock monitor to filter by network line and region.
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