Home / ASN Directory / AS18881

AS18881
TELEFONICA BRASIL S.A

AS18881 announces 4,581,376 IPv4 addresses across 164 routed ranges, registered in BR. Figures come from the public global routing table and are refreshed daily.

4.6M addressesIPv4 space announced
164Routed ranges
BRRegistry country

Is AS18881 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 164 announced ranges.

Range startRange endAddresses
177.16.0.0177.16.55.25514,336
177.16.56.0177.16.199.25536,864
177.16.200.0177.16.239.25510,240
177.16.240.0177.17.95.25528,672
177.17.96.0177.17.167.25518,432
177.17.168.0177.18.15.25526,624
177.18.16.0177.18.59.25511,264
177.18.60.0177.18.79.2555,120
177.18.80.0177.19.47.25557,344
177.19.48.0177.19.79.2558,192
177.19.80.0177.19.223.25536,864
177.19.224.0177.19.255.2558,192
177.40.0.0177.40.23.2556,144
177.40.24.0177.40.79.25514,336
177.40.80.0177.40.143.25516,384
177.40.144.0177.40.231.25522,528
177.40.232.0177.40.239.2552,048
177.40.240.0177.41.79.25524,576
177.41.80.0177.41.151.25518,432
177.41.152.0177.41.215.25516,384
177.41.216.0177.41.247.2558,192
177.41.248.0177.42.111.25530,720
177.42.112.0177.42.239.25532,768
177.42.240.0177.43.162.25545,824
177.43.163.0177.43.255.25523,808
177.96.0.0177.96.143.25536,864
177.96.144.0177.99.71.255178,176
177.99.72.0177.99.79.2552,048
177.99.80.0177.99.199.25530,720
177.99.200.0177.99.247.25512,288
177.99.248.0177.99.255.2552,048
177.132.0.0177.132.63.25516,384
177.132.64.0177.132.151.25522,528
177.132.152.0177.132.231.25520,480
177.132.232.0177.133.199.25557,344
177.133.200.0177.135.79.255100,352
177.135.80.0177.135.255.25545,056
177.145.0.0177.145.63.25516,384
177.156.0.0177.156.135.25534,816
177.156.136.0177.156.199.25516,384
177.156.200.0177.156.223.2556,144
177.156.224.0177.157.47.25520,480
177.157.48.0177.158.15.25557,344
177.158.16.0177.158.71.25514,336
177.158.72.0177.158.79.2552,048
177.158.80.0177.159.255.255110,592
177.204.0.0177.204.155.25539,936
177.204.156.0177.204.175.2555,120
177.204.176.0177.204.207.2558,192
177.204.208.0177.204.255.25512,288
177.205.0.0177.207.135.255165,888
177.207.136.0177.207.159.2556,144
177.207.160.0177.207.255.25524,576
179.83.0.0179.83.115.25529,696
179.83.116.0179.83.255.25535,840
179.95.0.0179.95.87.25522,528
179.95.88.0179.95.255.25543,008
179.131.192.0179.131.255.25516,384
179.162.0.0179.162.223.25557,344
179.162.240.0179.162.255.2554,096
179.176.0.0179.176.71.25518,432
179.176.72.0179.177.31.25555,296
179.177.32.0179.177.63.2558,192
179.177.64.0179.177.99.2559,216
179.177.100.0179.178.107.25567,584
179.178.108.0179.178.119.2553,072
179.178.120.0179.178.143.2556,144
179.178.144.0179.178.207.25516,384
179.178.208.0179.179.159.25553,248
179.179.160.0179.179.239.25520,480
179.179.240.0179.180.95.25528,672
179.180.96.0179.180.175.25520,480
179.180.176.0179.181.23.25526,624
179.181.24.0179.181.159.25534,816
179.181.160.0179.181.191.2558,192
179.181.192.0179.182.127.25549,152
179.182.128.0179.184.179.255144,384
179.184.180.0179.185.167.25562,464
179.185.168.0179.185.207.25510,240
179.185.208.0179.186.191.25561,440
179.186.192.0179.187.199.25567,584
179.187.200.0179.187.255.25514,336
186.212.0.0186.212.23.2556,144
186.212.24.0186.212.175.25538,912
186.212.176.0186.212.191.2554,096
186.212.192.0186.212.255.25516,384
186.213.0.0186.213.151.25538,912
186.213.152.0186.213.224.25518,688
186.213.225.0186.214.11.25511,008
186.214.12.0186.214.151.25535,840
186.214.152.0186.214.167.2554,096
186.214.168.0186.215.15.25526,624
186.215.16.0186.215.208.25549,408
186.215.209.0186.215.235.2556,912
186.215.236.0186.215.239.2551,024
186.215.240.0186.215.255.2554,096
187.58.0.0187.58.43.25511,264
187.58.44.0187.58.55.2553,072
187.58.56.0187.58.131.25519,456
187.58.132.0187.58.207.25519,456

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