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AS21928
T-MOBILE-AS21928

AS21928 announces 13,121,792 IPv4 addresses across 49 routed ranges, registered in US. Figures come from the public global routing table and are refreshed daily.

13.1M addressesIPv4 space announced
49Routed ranges
USRegistry country

Is AS21928 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 49 announced ranges.

Range startRange endAddresses
65.76.0.065.76.255.25565,536
66.94.0.066.94.17.2554,608
66.94.18.066.94.29.2553,072
66.94.30.066.94.31.255512
72.250.0.072.250.79.25520,480
72.250.96.072.250.111.2554,096
74.60.0.074.60.255.25565,536
75.122.0.075.123.255.255131,072
97.65.105.097.65.105.255256
100.128.0.0100.255.255.2558,388,608
104.152.20.0104.152.20.255256
162.160.0.0162.173.20.255857,344
162.173.21.0162.173.111.25523,296
162.173.112.0162.187.255.255954,368
162.188.0.0162.191.255.255262,144
167.20.0.0167.20.255.25565,536
168.73.0.0168.73.255.25565,536
170.206.0.0170.206.255.25565,536
172.32.0.0172.56.47.2551,585,152
172.56.48.0172.56.61.2553,584
172.56.62.0172.56.138.25519,712
172.56.139.0172.56.187.25512,544
172.56.188.0172.56.255.25517,408
172.57.0.0172.58.167.255108,544
172.58.168.0172.58.183.2554,096
172.58.184.0172.58.215.2558,192
172.58.216.0172.59.247.25573,728
172.59.248.0172.59.255.2552,048
172.60.0.0172.63.255.255262,144
174.141.208.0174.141.223.2554,096
206.29.168.0206.29.171.2551,024
206.29.188.0206.29.191.2551,024
208.54.0.0208.54.2.255768
208.54.3.0208.54.7.2551,280
208.54.8.0208.54.16.2552,304
208.54.17.0208.54.20.2551,024
208.54.21.0208.54.32.2553,072
208.54.34.0208.54.37.2551,024
208.54.38.0208.54.44.2551,792
208.54.45.0208.54.70.2556,656
208.54.71.0208.54.80.2552,560
208.54.81.0208.54.83.255768
208.54.84.0208.54.87.2551,024
208.54.88.0208.54.90.255768
208.54.91.0208.54.97.2551,792
208.54.98.0208.54.117.2555,120
208.54.118.0208.54.145.2557,168
208.54.146.0208.54.153.2552,048
208.54.154.0208.54.159.2551,536

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 65.76.0.0, 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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