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AS18558
NETBLK-RCOEK

AS18558 announces 72,204 IPv4 addresses across 32 routed ranges, registered in US. Figures come from the public global routing table and are refreshed daily.

72K addressesIPv4 space announced
32Routed ranges
USRegistry country

Is AS18558 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 32 announced ranges.

Range startRange endAddresses
137.164.1.110137.164.1.1112
137.164.1.236137.164.1.2394
137.164.3.16137.164.3.172
137.164.13.36137.164.13.394
198.188.95.0198.188.95.255256
204.26.32.0204.26.56.2556,400
204.100.0.0204.100.35.2559,216
204.100.36.0204.100.37.7264
204.100.37.8204.100.45.2552,296
204.100.46.0204.100.56.2552,816
204.100.57.0204.100.64.91,802
204.100.64.10204.100.82.2554,854
204.100.83.0204.100.84.191448
204.100.84.192204.100.85.255320
204.100.86.0204.100.94.2552,304
204.100.95.0204.100.99.2551,280
204.100.100.0204.100.103.2551,024
204.100.104.0204.100.134.2557,936
204.100.135.0204.100.139.2551,280
204.100.140.0204.100.159.2555,120
204.100.160.0204.100.169.712,376
204.100.169.72204.100.194.2556,584
204.100.195.0204.100.214.2555,120
204.100.215.0204.100.220.2551,536
204.100.221.0204.100.244.2476,136
204.100.244.248204.100.250.951,384
204.100.250.96204.100.251.191352
204.100.251.192204.100.251.23948
204.100.251.240204.100.252.6380
204.100.252.64204.100.254.207656
204.100.254.208204.100.255.251
204.100.255.3204.100.255.255253

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 137.164.1.110, 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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