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AS4837
CHINA169-BACKBONE CHINA UNICOM China169 Backbone

AS4837 announces 57,218,304 IPv4 addresses across 1,094 routed ranges, registered in CN. Figures come from the public global routing table and are refreshed daily.

57.2M addressesIPv4 space announced
1,094Routed ranges
CNRegistry country

Is AS4837 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 checks any address against the Tor exit list and the published cloud-provider ranges. VPN and proxy verdicts need a live visit: they come from a /v1/evaluate call with the browser token, not from a bare 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.

Maskbreak 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

First 100 of 1,094 ranges.

Range startRange endAddresses
1.24.0.01.24.31.2558,192
1.24.40.01.24.79.25510,240
1.24.95.01.24.191.25524,832
1.24.200.01.24.215.2554,096
1.24.220.01.24.235.2554,096
1.24.240.01.24.255.2554,096
1.25.8.01.25.23.2554,096
1.25.36.01.25.39.2551,024
1.25.48.01.25.91.25511,264
1.25.96.01.25.127.2558,192
1.25.136.01.28.11.255164,864
1.28.28.01.28.40.2553,328
1.28.43.01.28.95.25513,568
1.28.100.01.28.139.25510,240
1.28.144.01.28.147.2551,024
1.28.152.01.28.155.2551,024
1.28.160.01.28.167.2552,048
1.28.172.01.28.175.2551,024
1.28.180.01.28.223.25511,264
1.28.228.01.30.39.25582,944
1.30.52.01.30.91.25510,240
1.30.104.01.30.160.25514,592
1.30.161.01.30.163.255768
1.30.168.01.30.179.2553,072
1.30.188.01.31.35.25526,624
1.31.40.01.31.191.25538,912
1.31.196.01.31.255.25515,360
1.56.0.01.62.182.255440,064
1.62.183.01.63.255.25584,224
1.188.0.01.191.255.255262,144
14.204.0.014.204.11.2553,072
14.204.12.014.204.23.2553,072
14.204.24.014.204.43.2555,120
14.204.44.014.204.63.2555,120
14.204.64.014.204.211.25537,888
14.204.212.014.205.7.25513,312
14.205.8.014.205.47.25510,240
14.205.48.014.205.75.2557,168
14.205.76.014.205.95.2555,120
14.205.96.014.205.255.25540,960
27.0.128.027.0.128.255256
27.0.130.027.0.131.255512
27.8.0.027.15.255.255524,288
27.40.0.027.40.1.255512
27.40.8.027.40.10.255768
27.40.14.027.40.14.255256
27.40.22.027.40.61.25510,240
27.50.128.027.50.255.25532,768
27.98.224.027.98.255.2558,192
27.112.0.027.112.7.2552,048
27.115.80.027.115.80.255256
27.192.0.027.223.1.2552,032,128
27.223.2.027.223.98.25524,832
27.223.99.027.223.102.2551,024
27.223.103.027.223.255.25539,168
36.32.64.036.32.255.25549,152
36.33.48.036.33.151.25526,624
36.33.153.036.33.215.25516,128
36.33.248.036.33.255.2552,048
36.34.24.036.34.255.25559,392
36.35.32.036.35.247.25555,296
36.35.249.036.35.255.2551,792
36.50.226.036.50.226.255256
36.51.253.036.51.253.255256
36.248.0.036.251.255.255262,144
39.64.0.039.95.255.2552,097,152
42.4.0.042.7.255.255262,144
42.48.0.042.49.255.255131,072
42.52.0.042.59.255.255524,288
42.63.0.042.63.7.2552,048
42.63.8.042.63.255.25563,488
42.84.0.042.84.175.25545,056
42.84.184.042.87.255.255215,040
42.176.0.042.183.255.255524,288
42.224.0.042.226.7.255133,120
42.226.8.042.227.69.25581,408
42.227.70.042.228.4.25548,896
42.228.5.042.228.11.2551,792
42.228.12.042.228.13.255512
42.228.14.042.235.204.255507,648
42.235.205.042.239.255.255275,200
43.224.12.043.224.15.2551,024
43.224.24.043.224.27.2551,024
43.224.52.043.224.53.255512
43.224.80.043.224.83.2551,024
43.226.116.043.226.119.2551,024
43.227.104.043.227.107.2551,024
43.239.120.043.239.123.2551,024
43.240.56.043.240.59.2551,024
43.240.72.043.240.73.255512
43.240.204.043.240.207.2551,024
43.242.152.043.242.159.2552,048
43.242.164.043.242.167.2551,024
43.242.180.043.242.183.2551,024
43.243.4.043.243.7.2551,024
43.243.16.043.243.19.2551,024
43.243.156.043.243.159.2551,024
43.243.228.043.243.231.2551,024
43.247.4.043.247.4.255256
43.248.108.043.248.111.2551,024

Check a specific address

The AS tells you who announces a range. An address check answers whether one address inside it is a Tor exit or sits in a published cloud range — for example 1.24.0.0, the first address in this AS's announced space; whether a visitor is on a VPN or proxy needs a live visit. The free lookup tool takes any address, and the IP intelligence hub explains what each signal means.

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