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AS51964
ORANGE-BUSINESS-SERVICES-IPSN-ASN

AS51964 announces 1,277,184 IPv4 addresses across 140 routed ranges, registered in US. Figures come from the public global routing table and are refreshed daily.

1.3M addressesIPv4 space announced
140Routed ranges
USRegistry country

Is AS51964 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 checks any address against the Tor exit list and the published cloud-provider ranges. VPN and proxy verdicts need a live visit: they come from a /v1/evaluate call with the browser token, not from a bare 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.

Maskbreak 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 140 announced ranges.

Range startRange endAddresses
45.9.53.045.9.55.255768
57.66.0.057.66.14.2553,840
57.66.15.057.66.124.25528,160
57.66.125.057.66.192.25517,408
57.66.193.057.67.48.25528,672
57.67.49.057.67.216.25543,008
57.67.217.057.68.9.25512,544
57.68.11.057.68.54.25511,264
57.68.56.057.68.88.2558,448
57.68.89.057.68.90.255512
57.68.91.057.68.130.25510,240
57.68.131.057.69.48.25544,544
57.69.49.057.69.95.25512,032
57.69.96.057.69.191.25524,576
57.69.192.057.70.80.25537,120
57.70.81.057.70.119.2559,984
57.70.120.057.70.159.25510,240
57.72.0.057.72.38.2559,984
57.72.39.057.72.40.255512
57.72.41.057.72.48.2552,048
57.72.50.057.72.83.2558,704
57.72.84.057.72.160.25519,712
57.72.161.057.72.191.2557,936
57.72.192.057.73.48.25528,928
57.73.49.057.73.62.2553,584
57.73.63.057.73.155.25523,808
57.73.156.057.73.175.2555,120
57.73.176.057.73.207.2558,192
57.73.208.057.73.223.2554,096
57.73.224.057.74.28.25515,616
57.74.29.057.74.30.255512
57.74.31.057.74.32.255512
57.74.33.057.74.36.2551,024
57.74.37.057.74.91.25514,080
57.74.92.057.74.105.2553,584
57.74.106.057.74.243.25535,328
57.74.244.057.74.255.2553,072
57.77.0.057.77.20.2555,376
57.77.22.057.77.63.25510,752
57.77.128.057.77.175.25512,288
57.78.0.057.79.63.25581,920
57.79.64.057.79.143.25520,480
57.79.144.057.79.175.2558,192
57.79.192.057.79.197.2551,536
57.79.198.057.79.207.2552,560
57.79.224.057.79.239.2554,096
57.82.0.057.82.53.25513,824
57.82.54.057.82.63.2552,560
57.82.80.057.82.93.2553,584
57.82.94.057.82.99.2551,536
57.82.112.057.82.115.2551,024
57.82.128.057.82.143.2554,096
57.83.0.057.83.2.255768
57.83.3.057.83.23.2555,376
57.83.64.057.83.127.25516,384
57.83.160.057.83.175.2554,096
57.83.208.057.83.223.2554,096
57.86.0.057.86.111.25528,672
57.86.112.057.86.152.25510,496
57.86.153.057.86.175.2555,888
57.86.176.057.86.255.25520,480
57.90.0.057.90.7.2552,048
57.90.8.057.90.55.25512,288
57.90.56.057.90.135.25520,480
57.90.136.057.90.143.2552,048
57.90.144.057.90.183.25510,240
57.90.184.057.90.215.2558,192
57.90.216.057.90.255.25510,240
57.96.0.057.96.23.2556,144
57.96.24.057.96.83.25515,360
57.96.84.057.96.123.25510,240
57.96.124.057.96.127.2551,024
57.96.128.057.97.127.25565,536
57.97.128.057.98.107.25560,416
57.98.108.057.98.127.2555,120
57.98.128.057.98.255.25532,768
62.229.0.062.229.31.2558,192
62.229.64.062.229.127.25516,384
62.229.144.062.229.159.2554,096
62.229.224.062.229.239.2554,096
81.52.185.081.52.185.255256
140.209.240.0140.209.247.2552,048
140.209.249.0140.209.251.255768
140.209.254.0140.209.254.255256
142.225.49.0142.225.50.255512
144.95.70.0144.95.70.255256
156.134.0.0156.134.0.255256
156.134.16.0156.134.16.255256
156.134.32.0156.134.32.255256
156.134.48.0156.134.48.255256
157.150.0.0157.150.31.2558,192
157.150.33.0157.150.33.255256
157.150.35.0157.150.40.2551,536
157.150.42.0157.150.184.25536,608
157.150.187.0157.150.191.2551,280
157.150.193.0157.150.226.2558,704
157.150.228.0157.150.230.255768
157.150.232.0157.150.253.2555,632
157.150.255.0157.150.255.255256
164.43.0.0164.43.139.25535,840

Check a specific address

The AS tells you who announces a range. An address check answers whether one address inside it is a Tor exit or sits in a published cloud range — for example 45.9.53.0, the first address in this AS's announced space; whether a visitor is on a VPN or proxy needs a live visit. The free lookup tool takes any address, and the IP intelligence hub explains what each signal means.

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