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AS17638
CHINATELECOM-TJ-AS-AP ASN for TIANJIN Provincial Net of CT

AS17638 announces 603,392 IPv4 addresses across 143 routed ranges, registered in CN. Figures come from the public global routing table and are refreshed daily.

603K addressesIPv4 space announced
143Routed ranges
CNRegistry country

Is AS17638 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 143 announced ranges.

Range startRange endAddresses
36.106.0.036.106.1.255512
36.106.2.036.106.6.2551,280
36.106.7.036.106.17.2552,816
36.106.18.036.106.34.2554,352
36.106.35.036.106.111.25519,712
36.106.112.036.106.171.25515,360
36.106.172.036.106.183.2553,072
36.106.184.036.106.255.25518,432
42.80.0.042.80.21.2555,632
42.80.22.042.80.33.2553,072
42.80.34.042.80.43.2552,560
42.80.44.042.80.216.25544,288
42.80.217.042.80.239.2555,888
42.80.240.042.80.255.2554,096
42.81.37.042.81.41.2551,280
42.81.78.042.81.79.255512
42.122.0.042.122.15.2554,096
42.122.24.042.122.62.2559,984
42.122.64.042.122.167.25526,624
42.122.168.042.122.255.25522,528
106.47.0.0106.47.81.25520,992
106.47.82.0106.47.212.25533,536
106.47.213.0106.47.220.2552,048
106.47.221.0106.47.223.255768
106.47.224.0106.47.255.2558,192
123.150.0.0123.150.4.2551,280
123.150.5.0123.150.14.2552,560
123.150.15.0123.150.31.2554,352
123.150.32.0123.150.34.255768
123.150.35.0123.150.37.255768
123.150.38.0123.150.43.2551,536
123.150.44.0123.150.46.255768
123.150.47.0123.150.57.2552,816
123.150.58.0123.150.65.2552,048
123.150.66.0123.150.69.2551,024
123.150.74.0123.150.75.255512
123.150.80.0123.150.81.255512
123.150.82.0123.150.92.2552,816
123.150.93.0123.150.103.2552,816
123.150.104.0123.150.109.2551,536
123.150.110.0123.150.141.2558,192
123.150.142.0123.150.143.255512
123.150.144.0123.150.145.255512
123.150.146.0123.150.147.255512
123.150.148.0123.150.173.2556,656
123.150.175.0123.150.207.2558,448
123.150.209.0123.150.227.2554,864
123.150.230.0123.150.242.2553,328
123.150.243.0123.151.7.2555,376
123.151.16.0123.151.17.255512
123.151.18.0123.151.19.255512
123.151.21.0123.151.24.2551,024
123.151.25.0123.151.25.255256
123.151.28.0123.151.38.2552,816
123.151.41.0123.151.41.255256
123.151.43.0123.151.45.255768
123.151.80.0123.151.89.2552,560
123.151.90.0123.151.91.255512
123.151.112.0123.151.113.255512
123.151.114.0123.151.123.2552,560
123.151.125.0123.151.131.2551,792
123.151.132.0123.151.136.2551,280
123.151.140.0123.151.143.2551,024
123.151.145.0123.151.147.255768
123.151.159.0123.151.164.2551,536
123.151.166.0123.151.173.2552,048
123.151.174.0123.151.175.255512
123.151.184.0123.151.189.2551,536
123.151.191.0123.151.255.25516,640
125.213.32.0125.213.47.2554,096
139.220.192.0139.220.195.2551,024
180.212.0.0180.212.25.2556,656
180.212.26.0180.212.33.2552,048
180.212.34.0180.212.35.255512
180.212.36.0180.212.50.2553,840
180.212.51.0180.212.139.25522,784
180.212.140.0180.212.153.2553,584
180.212.154.0180.212.163.2552,560
180.212.164.0180.212.245.25520,992
180.212.246.0180.212.254.2552,304
180.212.255.0180.213.10.2553,072
180.213.11.0180.213.23.2553,328
180.213.26.0180.213.30.2551,280
180.213.32.0180.213.32.255256
180.213.36.0180.213.38.255768
180.213.39.0180.213.42.2551,024
180.213.44.0180.213.47.2551,024
180.213.68.0180.213.76.2552,304
180.213.78.0180.213.99.2555,632
180.213.104.0180.213.111.2552,048
180.213.128.0180.213.239.25528,672
202.143.16.0202.143.17.255512
218.30.175.0218.30.175.255256
218.30.189.0218.30.189.255256
219.150.32.0219.150.50.2554,864
219.150.51.0219.150.53.255768
219.150.54.0219.150.84.2557,936
219.150.85.0219.150.86.255512
219.150.87.0219.150.96.2552,560
219.150.97.0219.150.103.2551,792

Check a specific address

The AS tells you who announces a range. Whether one address inside it is currently a tunnel is a live question, answered per address — for example 36.106.0.0, the first address in this AS's announced space. The free lookup tool takes any address, and the IP intelligence hub explains what each signal means.

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