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AS51604
EKAT-AS

AS51604 announces 143,616 IPv4 addresses across 36 routed ranges, registered in RU. Figures come from the public global routing table and are refreshed daily.

144K addressesIPv4 space announced
36Routed ranges
RURegistry country

Is AS51604 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 36 announced ranges.

Range startRange endAddresses
5.165.0.05.165.16.2554,352
5.165.17.05.165.20.2551,024
5.165.21.05.165.24.2551,024
5.165.25.05.165.31.2551,792
5.165.224.05.165.239.2554,096
5.166.32.05.166.63.2558,192
5.167.224.05.167.255.2558,192
77.223.64.077.223.95.2558,192
79.136.168.079.136.171.2551,024
79.172.8.079.172.8.255256
79.172.37.079.172.37.255256
80.83.240.080.83.255.2554,096
85.115.160.085.115.185.2556,656
85.115.186.085.115.191.2551,536
87.251.180.087.251.180.255256
88.85.192.088.85.223.2558,192
91.230.150.091.230.150.255256
91.230.152.091.230.155.2551,024
92.248.128.092.248.186.25515,104
92.248.187.092.248.190.2551,024
92.248.191.092.248.255.25516,640
109.195.96.0109.195.109.2553,584
109.195.110.0109.195.111.255512
176.215.0.0176.215.7.2552,048
176.215.8.0176.215.31.2556,144
178.78.48.0178.78.63.2554,096
188.187.235.0188.187.235.255256
188.234.80.0188.234.111.2558,192
188.234.192.0188.234.196.2551,280
188.234.197.0188.234.219.2555,888
188.234.220.0188.234.242.2555,888
188.234.243.0188.234.247.2551,280
188.234.248.0188.234.255.2552,048
195.211.28.0195.211.31.2551,024
217.76.176.0217.76.191.2554,096
217.119.80.0217.119.95.2554,096

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 5.165.0.0, 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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