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AS20057
ATT-MOBILITY-LLC-AS20057

AS20057 announces 4,050,176 IPv4 addresses across 378 routed ranges, registered in US. Figures come from the public global routing table and are refreshed daily.

4.1M addressesIPv4 space announced
378Routed ranges
USRegistry country

Is AS20057 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

First 100 of 378 ranges.

Range startRange endAddresses
12.72.0.012.72.83.25521,504
12.72.84.012.72.86.255768
12.72.87.012.72.111.2556,400
12.72.112.012.72.117.2551,536
12.72.118.012.72.126.2552,304
12.72.127.012.72.130.2551,024
12.72.131.012.72.132.255512
12.72.133.012.72.151.2554,864
12.72.152.012.72.175.2556,144
12.72.176.012.72.247.25518,432
12.72.248.012.72.253.2551,536
12.72.254.012.73.127.25533,280
66.102.186.066.102.186.255256
70.144.0.070.144.63.25516,384
107.72.162.0107.72.165.2551,024
107.72.174.0107.72.174.255256
107.72.176.0107.72.178.255768
107.72.225.0107.72.225.255256
107.77.64.0107.77.97.2558,704
107.77.100.0107.77.111.2553,072
107.77.192.0107.77.192.255256
107.77.194.0107.77.237.25511,264
107.80.0.0107.80.2.255768
107.80.3.0107.80.4.255512
107.80.5.0107.80.5.255256
107.80.7.0107.80.79.25518,688
107.80.80.0107.80.95.2554,096
107.80.96.0107.80.128.2558,448
107.80.129.0107.80.129.255256
107.80.130.0107.80.142.2553,328
107.80.143.0107.80.146.2551,024
107.80.147.0107.80.150.2551,024
107.80.151.0107.80.154.2551,024
107.80.155.0107.80.196.25510,752
107.80.197.0107.80.198.255512
107.80.199.0107.80.214.2554,096
107.80.215.0107.80.216.255512
107.80.217.0107.80.235.2554,864
107.80.236.0107.80.238.255768
107.80.239.0107.80.250.2553,072
107.80.251.0107.80.253.255768
107.80.254.0107.81.255.25566,048
107.84.0.0107.84.3.2551,024
107.84.4.0107.84.14.2552,816
107.84.15.0107.84.28.2553,584
107.84.29.0107.84.143.25529,440
107.84.144.0107.84.151.2552,048
107.84.153.0107.84.154.255512
107.84.155.0107.84.177.2555,888
107.84.178.0107.84.190.2553,328
107.84.191.0107.84.200.2552,560
107.84.201.0107.84.203.255768
107.84.204.0107.84.208.2551,280
107.84.209.0107.84.211.255768
107.84.212.0107.84.214.255768
107.84.215.0107.85.7.25512,544
107.85.8.0107.85.17.2552,560
107.85.18.0107.85.32.2553,840
107.85.33.0107.85.34.255512
107.85.35.0107.85.56.2555,632
107.85.57.0107.85.65.2552,304
107.85.66.0107.85.77.2553,072
107.85.78.0107.85.110.2558,448
107.85.111.0107.85.115.2551,280
107.85.116.0107.85.117.255512
107.85.118.0107.85.159.25510,752
107.85.160.0107.85.182.2555,888
107.85.183.0107.85.238.25514,336
107.85.239.0107.85.255.2554,352
107.87.0.0107.87.127.25532,768
107.87.136.0107.87.139.2551,024
107.87.144.0107.87.154.2552,816
107.87.192.0107.87.255.25516,384
107.89.0.0107.89.6.2551,792
107.89.7.0107.89.39.2558,448
107.89.40.0107.89.49.2552,560
107.89.50.0107.89.60.2552,816
107.89.61.0107.89.63.255768
107.89.64.0107.89.65.255512
107.89.66.0107.89.67.255512
107.89.68.0107.89.194.25532,512
107.89.195.0107.89.204.2552,560
107.89.205.0107.89.206.255512
107.89.207.0107.89.216.2552,560
107.89.217.0107.89.218.255512
107.89.219.0107.89.221.255768
107.89.222.0107.89.229.2552,048
107.89.230.0107.89.233.2551,024
107.89.234.0107.90.39.25515,872
107.90.40.0107.90.45.2551,536
107.90.46.0107.90.48.255768
107.90.49.0107.90.58.2552,560
107.90.59.0107.90.60.255512
107.90.61.0107.90.62.255512
107.90.63.0107.90.65.255768
107.90.66.0107.90.91.2556,656
107.90.92.0107.90.103.2553,072
107.90.104.0107.90.117.2553,584
107.90.118.0107.90.126.2552,304
107.90.127.0107.90.129.255768

Check a specific address

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