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AS37963
ALIBABA-CN-NET Hangzhou Alibaba Advertising Co.,Ltd.

AS37963 announces 9,420,288 IPv4 addresses across 128 routed ranges, registered in CN. Figures come from the public global routing table and are refreshed daily.

9.4M addressesIPv4 space announced
128Routed ranges
CNRegistry country

Is AS37963 datacenter space?

Not according to the nine cloud and CDN providers whose published range lists we track. That is a statement about those specific lists, not proof the space is residential — plenty of hosting companies never publish machine-readable ranges, and this AS may well be one of them.

The reliable way to classify a specific address is to check it directly rather than to infer from the AS. The free lookup tool returns live tunnel and datacenter signals for any address.

What an AS number does and does not tell you

An autonomous system number identifies who announces a block of addresses to the internet's routing table. It is an organisational fact, and a durable one — useful for attributing traffic to a hosting company, a carrier, or a university.

It is not a risk signal. A residential ISP's AS carries the household traffic of millions of ordinary customers and, at the same time, whatever residential proxy exits have been installed on those customers' devices. A hosting AS carries scrapers and legitimate server-to-server integrations in the same ranges. Scoring an address on the reputation of its AS produces exactly the false positives that make fraud tooling untrustworthy.

Sentinel does not feed AS names or routing data into its risk score. Tunnel detection comes from live network intelligence, and the dch signal comes from provider-published ranges. This directory exists to answer "who announces this address," which is a different and genuinely useful question.

Announced IPv4 ranges

All 128 announced ranges.

Range startRange endAddresses
8.128.4.08.128.7.2551,024
8.128.32.08.128.111.25520,480
8.129.0.08.132.107.255224,256
8.132.108.08.134.247.255166,912
8.134.248.08.137.135.255167,936
8.137.136.08.138.54.25544,800
8.138.55.08.138.71.2554,352
8.138.72.08.141.195.255228,352
8.141.196.08.141.207.2553,072
8.141.208.08.147.0.255340,224
8.147.1.08.148.31.25573,472
8.148.64.08.148.169.25527,136
8.148.170.08.150.23.25593,696
8.150.64.08.150.65.255512
8.152.0.08.152.75.25519,456
8.152.76.08.153.116.25576,032
8.153.117.08.155.196.255151,552
8.155.197.08.156.107.25542,752
8.156.108.08.162.127.255398,336
8.163.0.08.165.49.255143,872
8.165.50.08.166.193.255102,400
8.166.194.08.167.1.25516,384
8.167.2.08.169.255.255196,096
8.176.0.08.176.159.25540,960
39.96.0.039.97.203.255117,760
39.97.208.039.108.255.255733,184
42.96.128.042.96.239.25528,672
42.96.240.042.96.255.2554,096
42.120.0.042.120.248.25563,744
42.120.249.042.121.255.25567,328
42.156.128.042.156.255.25532,768
45.113.40.045.113.43.2551,024
47.92.0.047.96.204.255314,624
47.96.205.047.105.25.255544,000
47.105.26.047.108.108.255217,856
47.108.109.047.109.1.25538,144
47.109.2.047.114.16.255331,520
47.114.17.047.118.164.255300,032
47.118.165.047.123.23.255291,584
47.123.24.047.123.255.25559,392
59.82.0.059.82.2.255768
59.82.3.059.82.124.25531,232
59.82.125.059.82.137.2553,328
59.82.138.059.82.159.2555,632
59.110.0.059.110.255.25565,536
60.205.0.060.205.133.25534,304
60.205.134.060.205.255.25531,232
101.37.0.0101.37.255.25565,536
101.132.0.0101.133.201.255117,248
101.133.202.0101.133.255.25513,824
101.200.0.0101.201.255.255131,072
103.52.196.0103.52.199.2551,024
106.11.0.0106.11.1.255512
106.11.2.0106.11.24.2555,888
106.11.25.0106.11.235.25554,016
106.11.236.0106.11.255.2555,120
106.14.0.0106.15.255.255131,072
110.75.0.0110.75.139.25535,840
110.75.140.0110.75.230.25523,296
110.75.231.0110.75.233.255768
110.75.234.0110.76.0.2555,888
110.76.1.0110.76.20.2555,120
110.76.22.0110.76.22.255256
110.76.24.0110.76.63.25510,240
110.173.192.0110.173.196.2551,280
110.173.197.0110.173.223.2556,912
112.74.0.0112.74.255.25565,536
112.124.0.0112.124.209.25553,760
112.124.210.0112.127.255.255208,384
114.55.0.0114.55.255.25565,536
114.215.0.0114.215.167.25543,008
114.215.168.0114.215.223.25514,336
114.215.224.0114.215.255.2558,192
115.28.0.0115.29.72.25584,224
115.29.73.0115.29.159.25522,272
115.29.160.0115.29.255.25524,576
115.124.16.0115.124.31.2554,096
116.62.0.0116.62.255.25565,536
118.31.0.0118.31.206.25552,992
118.31.207.0118.31.255.25512,544
118.178.0.0118.178.255.25565,536
118.190.0.0118.190.255.25565,536
119.23.0.0119.23.255.25565,536
119.38.208.0119.38.219.2553,072
119.38.220.0119.38.223.2551,024
119.42.224.0119.42.232.2552,304
119.42.233.0119.42.234.255512
119.42.235.0119.42.248.2553,584
119.42.249.0119.42.255.2551,792
120.24.0.0120.27.79.255217,088
120.27.80.0120.27.255.25545,056
120.55.0.0120.55.255.25565,536
120.76.0.0120.77.193.255115,200
120.77.194.0120.79.255.255146,944
121.0.16.0121.0.31.2554,096
121.40.0.0121.42.131.255164,864
121.42.132.0121.42.255.25531,744
121.43.0.0121.43.255.25565,536
121.89.0.0121.89.255.25565,536
121.196.0.0121.199.255.255262,144

Check a specific address

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