如何判断一个 ip 是不是 cdn？

可以发出来帮你查一查

@alect 非常感谢，但是我想要能编程实现的方法。

一般CDN都在header里面有标示

@Andy1999 ？？？

大厂的CDN一般都有AS自治域
自己拿一个IP去查AS号再去查AS号的信息呗

@Andy1999 的意思是你打开一个托管到CDN的URL比如

http://www.12306.cn/mormhweb/images/icobg_1.1.png
X-Cache:HIT from cache.51cdn.com
X-Powered-By:Servlet/2.5 JSP/2.1
X-Via:1.1 yc21:9 (Cdn Cache Server V2.0)

https://cdn.v2ex.co/avatar/a6a2/62e3/44095_large.png
etag:"55bcde3b-3147"
expires:Thu, 31 Dec 2037 23:55:55 GMT
last-modified:Sat, 01 Aug 2015 14:56:59 GMT
x-orca-accelerator:HIT from 064.mul.hkg01.hk.krill.c3edge.net

Header头里面就有CDN供应商的信息啊

@webjin 比如七牛 header里有一条是CDN qiniu

@lshero 关键是这个header由各厂自己定义各不相同，有的还可能没header，难以判断啊。赶脚只能自己先收集一份名单，再做判断了。

http://dns.aizhan.com/
这边查也是个办法，大厂的CDN往往会出来一大堆域名

@lshero bgp

@lshero 接上->.he.net

<cdn>
<!--加速乐 变更时会发微信-->
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<item>117.21.219.0-117.21.219.255</item>
<item>218.75.177.0-218.75.177.255</item>

<!--dnspod 39条记录-->
<item>121.14.73.8</item>
<item>119.147.65.237</item>
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<item>103.7.28.45</item>
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<item>184.105.164.231</item>

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<item>120.52.18.1-120.52.18.255</item>
<item>119.84.15.0-119.84.15.255</item>

<!--安全宝-->
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<!--百度云加速 包含了即将上线的节点-->
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<item>117.34.11

<!--百度云加速 包含了即将上线的节点-->
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<item>119.188.132.0-119.188.132.254</item>
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<item>120.52.113.1-120.52.114.254</item>
<item>182.150.0.1-182.150.1.254</item>

<!--网宿科技CDN-->
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<item>106.120.191.0-106.120.191.254</item>
<item>111.206.169.0-111.206.169.254</item>
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<item>171.112.96.0-171.112.96.254</item>
<item>182.140.142.0-182.140.142.254</item>
<item>182.140.147.0-182.140.147.254</item>
<item>183.136.208.0-183.136.208.254</item>
<item>183.57.144.0-183.57.144.254</item>
<item>183.60.232.0-183.60.232.254</item>
<item>202.100.78.0-202.100.78.254</item>
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<item>218.92.220.0-218.92.220.254</item>
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<item>180.97.180.1-180.97.180.254</item>
<item>58.51.148.1-58.51.148.254</item>
<item>218.58.222.1-218.58.222.254</item>

<!--百度加速乐（可能已经不需要了）-->
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<item>175.100.207.0-175.100.207.255</item>
<item>221.10.36.0-221.10.36.255</item>

<!--蓝汛CDN-->
<item>118.123.16.0-118.123.16.255</item>

<!--ttt-->
<item>118.123.250.11</item>
<item>206.161.216.200</item>
<item>203.116.173.206</item>
<item>203.176.237.57</item>
<item>183.90.187.98</item>

<!--阿里云CDN-->
<item>42.120.107.1-42.120.107.30</item>
<item>42.120.107.33-42.120.107.35</item>
<item>42.120.107.40</item>
<item>42.120.107.50</item>
<item>121.42.17.201-121.42.17.230</item>
<item>121.42.17.240</item>
<item>121.42.17.250</item>
<item>140.205.253.129-140.205.253.201</item>

<!--微软云适配-->
<item>42.159.6.252</item>
<item>168.63.134.10</item>
<item>42.159.8.25</item>
<item>42.159.4.166</item>

<!--牛盾-->
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<item>113.31.87.0-113.31.87.255</item>
<item>183.56.172.0-183.56.172.254</item>
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<item>222.88.94.0-222.88.94.255</item>
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<item>60.8.151.0-60.8.151.255</item>
<item>61.174.9.0-61.174.9.255</item>

<!--CloudFlare-->
<item>103.21.244.0-103.21.247.254</item>
<item>103.22.200.0-103.22.203.254</item>
<item>103.31.4.0-103.31.7.254</item>
<item>104.16.0.0-104.31.255.254</item>
<item>108.162.192.0-108.162.255.254</item>
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<item>162.158.0.0-162.159.255.254</item>
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<item>188.114.96.0-188.114.111.254</item>
<item>190.93.240.0-190.93.255.254</item>
<item>197.234.240.0-197.234.243.254</item>
<item>198.41.128.0-198.41.255.254</item>
<item>199.27.128.0-199.27.135.254</item>

<!--Incapdns-->
<item>199.83.128.1-199.83.135.254</item>
<item>198.143.32.1-198.143.63.254</item>
<item>149.126.72.1-149.126.79.254</item>
<item>103.28.248.1-103.28.251.254</item>
<item>185.11.124.1-185.11.127.254</item>
<item>45.64.64.0-45.64.67.255</item>
<item>192.230.64.1-192.230.127.254</item>

V2EX 截断了好几次 楼主将就着看看吧，还有腾讯云大禹和腾讯云CDN 我暂时没收集到
以及Akamai的 太大了发不上来

@Andy1999 写进 gist 里面吧，这样好长 = =。

@Andy1999 太感谢了！请问你是怎么做的呢？如果可以最好在github维护一个列表，相信能服务很多人。

@ctftemp Azure开G5 zmap 扫全网IP
开80的拿出来 再扫
乌云上面有
由于坑爹的Akamai IP数实在太大，没办法维护
比如Akamai 有一个段都是的 貌似是23.0.0.0-23.255.255.255
这实在没办法全贴上来 我尽力补齐

@Andy1999 明白了，谢谢