Home / ASN Directory / AS1637

AS1637
DNIC-AS-01637

AS1637 announces 201,216 IPv4 addresses across 44 routed ranges, registered in US. Figures come from the public global routing table and are refreshed daily.

201K addressesIPv4 space announced
44Routed ranges
USRegistry country

Is AS1637 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 44 announced ranges.

Range startRange endAddresses
6.16.88.06.16.89.255512
6.134.24.06.134.27.2551,024
143.46.0.0143.46.5.2551,536
143.46.6.0143.46.39.2558,704
143.46.40.0143.46.53.2553,584
143.46.54.0143.46.60.2551,792
143.46.61.0143.46.110.25512,800
143.46.111.0143.46.135.2556,400
143.46.136.0143.46.158.2555,888
143.46.159.0143.46.161.255768
143.46.162.0143.46.190.2557,424
143.46.191.0143.46.193.255768
143.46.194.0143.46.196.255768
143.46.197.0143.46.210.2553,584
143.46.211.0143.46.229.2554,864
143.46.230.0143.46.240.2552,816
143.46.241.0143.46.253.2553,328
143.46.254.0143.46.255.255512
143.68.152.0143.68.159.2552,048
147.248.24.0147.248.24.255256
155.5.0.0155.5.18.2554,864
155.5.19.0155.5.35.2554,352
155.5.36.0155.5.106.25518,176
155.5.107.0155.5.116.2552,560
155.5.117.0155.5.123.2551,792
155.5.124.0155.5.143.2555,120
155.5.144.0155.5.153.2552,560
155.5.154.0155.6.35.25535,328
155.6.36.0155.6.37.255512
155.6.38.0155.6.48.2552,816
155.6.49.0155.6.51.255768
155.6.52.0155.6.53.255512
155.6.54.0155.6.98.25511,520
155.6.99.0155.6.100.255512
155.6.101.0155.6.194.25524,064
155.6.195.0155.6.200.2551,536
155.6.201.0155.6.210.2552,560
155.6.211.0155.6.220.2552,560
155.6.221.0155.6.240.2555,120
155.6.241.0155.6.243.255768
155.6.244.0155.6.255.2553,072
155.20.105.0155.20.105.255256
155.20.109.0155.20.109.255256
155.28.2.0155.28.2.255256

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 6.16.88.0, 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.

Check a specific address in this AS.
Live VPN, proxy, Tor, and datacenter signals. Free tier, 1,000 requests/hour.
Get a free API key →
All ASNs Example: 6.16.88.0 IP intelligence Free IP lookup Hosting provider ranges Residential proxy networks TLS fingerprinting