ASN lookup
ASN lookup: enter an IP address 或 an AS number such as AS15169 至 see the network operator 和 the prefixes it announces.
数据 comes 从 RIPEstat 和 is requested when you press the button.
关于ASN lookup
ASN lookup: enter an IP address 或 an AS number such as AS15169 至 see the network operator 和 the prefixes it announces.
属于 SmartCalcy“数据与网络”板块。它在你的浏览器中运行，无需账号，使用你自己的货币和单位（可在页面顶部更改），所给结果仅为估算、仅供参考，因此在依赖结果之前请查阅官方指引。
如何使用ASN lookup
它计算什么，何时使用
Finds the autonomous system number (ASN) the network that announces an IP address、or the holder、announced address ranges an AS number you already know. An ASN identifies one network on the internet, such as a provider, a cloud company 或 a university.
使用步骤
- Enter an IP address, 或 an AS 数字 such as AS15169.
- Press “Look up ASN”.
- Read the AS 数字、holder、whether it 是 global routing. 的 visible
- Check the list 第 announced prefixes undernea 次.
各输入项的含义
- IP address 或 AS 数字 – An IPv4 或 IPv6 address, 或 第 an AS number wi 次 或 without the “AS” prefix.
如何阅读结果
- AS 数字 和 holder – The network’s 数字 和 the organisation that holds it.
- Announced – Whether the 网络 是 the global routing table. 的 currently visible
- Prefixes announced – The count IPv4 和 IPv6 address ranges the network advertises, with a sample them.
公式
否 calculation. Networks use the BGP protocol 至 announce which address ranges (prefixes) they 罐 reach, 每件 under an AS 数字. RIPEstat reads these announcements 从 routing collectors around the world.
计算示例
Looking up 8.8.8.8 returns AS15169, held by Google LLC, which announces 8.8.8.0/24 among many other ranges.
假设与局限
- 数据 comes 从 RIPEstat 和 is requested when you press the button.
- Only the first part a long prefix list 是 shown.
- An address that nobody announces cannot be mapped 至 a 网络.
常见错误
- Entering an AS 数字 with a typo 或 extra text, such as “AS 15169 Google”.
- Assuming one organisation has one ASN. Large companies often operate several.
- Reading the ASN as a location. It identifies a 网络, which 罐 span many countries.
常见问题
What 是 an ASN?
An autonomous system 数字 是 a unique number given 至 a network that has its own routing policy on the internet.
What 是 a prefix?
A 极差 CIDR form, such as 8.8.8.0/24, that a network announces 的 IP addresses written 至 the rest the internet.
Why does an address have 否 ASN?
The address may be private, unallocated 或 not currently announced by any 网络.
Is this the same as IP WHOIS?
routing. 的 否. WHOIS shows the registry record. ASN lookup shows which 网络 actually announces the address