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AS637
DNIC-ASBLK-00616-00665

AS637 announces 932,864 IPv4 addresses across 193 routed ranges, registered in US. Figures come from the public global routing table and are refreshed daily.

933K addressesIPv4 space announced
193Routed ranges
USRegistry country

Is AS637 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 193 announced ranges.

Range startRange endAddresses
137.232.161.0137.232.161.255256
137.232.194.0137.232.194.255256
137.233.5.0137.233.5.255256
137.234.0.0137.234.0.255256
137.234.2.0137.234.3.255512
137.234.26.0137.234.26.255256
137.234.51.0137.234.51.255256
137.234.64.0137.234.67.2551,024
137.234.76.0137.234.77.255512
137.234.80.0137.234.84.2551,280
137.234.86.0137.234.87.255512
137.234.89.0137.234.89.255256
137.234.110.0137.234.110.255256
137.234.128.0137.234.135.2552,048
137.234.137.0137.234.140.2551,024
137.234.156.0137.234.167.2553,072
137.234.169.0137.234.169.255256
137.234.172.0137.234.173.255512
137.234.178.0137.234.178.255256
137.234.181.0137.234.183.255768
137.234.187.0137.234.187.255256
137.234.192.0137.234.195.2551,024
137.234.200.0137.234.204.2551,280
137.234.206.0137.234.206.255256
137.234.208.0137.234.208.255256
137.234.250.0137.234.250.255256
137.235.4.0137.235.4.255256
137.235.123.0137.235.123.255256
137.235.126.0137.235.130.2551,280
137.235.131.0137.235.131.255256
137.235.133.0137.235.133.255256
137.235.141.0137.235.141.255256
137.235.143.0137.235.143.255256
137.235.148.0137.235.148.255256
137.235.172.0137.235.172.255256
137.235.200.0137.235.200.255256
137.235.202.0137.235.202.255256
137.235.210.0137.235.210.255256
137.235.236.0137.235.239.2551,024
138.156.0.0138.156.233.25559,904
138.156.234.0138.157.31.25513,824
138.157.57.0138.157.57.255256
138.157.64.0138.157.65.255512
138.157.84.0138.157.85.255512
138.157.105.0138.157.107.255768
138.157.110.0138.157.110.255256
138.157.112.0138.157.115.2551,024
138.157.119.0138.157.119.255256
138.157.124.0138.157.125.255512
138.157.130.0138.157.131.255512
138.157.207.0138.157.207.255256
138.157.210.0138.157.211.255512
138.157.216.0138.157.216.255256
138.157.240.0138.157.240.255256
138.157.248.0138.157.249.255512
138.158.0.0138.158.255.25565,536
138.163.160.0138.163.163.2551,024
138.167.0.0138.167.15.2554,096
138.167.20.0138.167.21.255512
138.167.32.0138.167.63.2558,192
138.167.65.0138.167.85.2555,376
138.167.104.0138.167.113.2552,560
138.167.119.0138.167.167.25512,544
138.167.176.0138.167.191.2554,096
138.167.200.0138.167.203.2551,024
138.167.206.0138.167.206.255256
138.167.208.0138.167.232.2556,400
138.167.235.0138.167.239.2551,280
138.167.248.0138.167.251.2551,024
138.168.0.0138.168.15.2554,096
138.168.16.0138.168.183.25543,008
138.168.184.0138.168.194.2552,816
138.168.195.0138.168.255.25515,616
139.241.81.0139.241.81.255256
158.236.0.0158.239.15.255200,704
158.239.32.0158.239.147.25529,696
158.239.148.0158.239.161.2553,584
158.239.162.0158.239.175.2553,584
158.239.176.0158.239.183.2552,048
158.239.184.0158.240.4.25519,712
158.240.32.0158.240.54.2555,888
158.240.58.0158.240.58.255256
158.240.96.0158.240.97.255512
158.240.131.0158.240.137.2551,792
158.240.160.0158.240.167.2552,048
158.240.174.0158.240.175.255512
158.240.180.0158.240.180.255256
158.240.183.0158.240.183.255256
158.240.198.0158.240.198.255256
158.240.210.0158.240.212.255768
158.240.216.0158.240.217.255512
158.240.226.0158.240.227.255512
158.240.242.0158.240.248.2551,792
158.243.0.0158.243.7.2552,048
158.243.8.0158.243.13.2551,536
158.243.14.0158.243.20.2551,792
158.243.21.0158.243.49.2557,424
158.243.50.0158.243.58.2552,304
158.243.59.0158.243.78.2555,120
158.243.79.0158.243.94.2554,096

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 137.232.161.0, 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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