Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Isp allocation +5
- Trust score 70 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About AT&T
AT&T Inc., an abbreviation of its predecessor's original name, the American Telephone and Telegraph Company, is an American multinational telecommunications company headquartered at the Whitacre Tower in Downtown Dallas, Texas. AT&T is the world's third-largest telecommunications company by revenue, the third-largest wireless carrier in the United States behind T-Mobile and Verizon, and the nation's largest fiber internet provider.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS19957 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 66.4.27.0/24 | 17,101 | 2026-07-23 16:51:25 |
| 66.4.32.0/23 | 9,357 | 2026-07-23 16:51:30 |
| 66.4.126.0/24 | 8,158 | 2026-07-23 16:50:59 |
| 66.4.81.0/24 | 8,148 | 2026-07-23 16:50:59 |
| 66.4.40.0/24 | 8,132 | 2026-07-23 16:50:59 |
| 66.4.18.0/24 | 8,131 | 2026-07-23 16:50:59 |
| 66.4.16.0/23 | 8,122 | 2026-07-23 16:50:59 |
| 66.4.38.0/24 | 8,100 | 2026-07-23 16:50:59 |
| 66.4.78.0/24 | 8,092 | 2026-07-23 16:50:59 |
| 66.4.19.0/24 | 6,675 | 2026-07-23 16:50:59 |
| 12.204.201.0/24 | 6,658 | 2026-07-23 16:51:06 |
| 12.204.206.0/24 | 5,301 | 2026-07-23 16:51:06 |
| 12.204.209.0/24 | 5,279 | 2026-07-23 16:51:06 |
| 12.204.208.0/20 | 5,269 | 2026-07-23 16:50:53 |
| 66.4.9.0/24 | 5,257 | 2026-07-23 16:50:59 |
| 12.204.208.0/24 | 5,254 | 2026-07-23 16:51:06 |
| 66.4.60.0/23 | 5,210 | 2026-07-23 16:51:30 |
| 66.4.0.0/16 | 5,196 | 2026-07-23 16:51:30 |
| 66.4.124.0/24 | 5,179 | 2026-07-23 16:51:30 |
| 66.4.14.0/23 | 5,177 | 2026-07-23 16:51:30 |
| 12.204.216.0/21 | 5,176 | 2026-07-23 16:51:06 |
| 66.4.28.0/22 | 5,149 | 2026-07-23 16:51:30 |
| 66.4.18.0/23 | 5,072 | 2026-07-23 16:51:30 |
| 66.4.8.0/23 | 5,057 | 2026-07-23 16:51:30 |
| 170.141.56.0/23 | 5,051 | 2026-07-23 16:51:34 |
| 208.182.124.0/24 | 5,043 | 2026-07-23 16:51:30 |
| 208.182.0.0/16 | 5,029 | 2026-07-23 16:51:30 |
| 170.141.60.0/23 | 5,023 | 2026-07-23 16:50:42 |
| 208.182.101.0/24 | 5,016 | 2026-07-23 16:51:30 |
| 170.142.0.0/16 | 5,007 | 2026-07-23 16:51:06 |
| 170.143.0.0/16 | 4,997 | 2026-07-23 16:51:06 |
| 206.23.0.0/16 | 4,990 | 2026-07-23 16:51:06 |
| 64.79.176.0/21 | 4,983 | 2026-07-23 16:51:30 |
| 198.146.0.0/16 | 4,970 | 2026-07-23 16:51:30 |
| 12.204.192.0/20 | 3,929 | 2026-07-23 16:50:53 |
| 72.159.76.0/24 | 3,562 | 2026-07-23 16:51:25 |
| 72.158.184.0/24 | 3,559 | 2026-07-23 16:51:25 |
| 70.150.21.0/24 | 3,544 | 2026-07-23 16:51:34 |
| 208.63.128.0/20 | 3,539 | 2026-07-23 16:51:14 |
| 70.150.247.0/24 | 3,538 | 2026-07-23 16:50:42 |
| 208.63.129.0/24 | 3,526 | 2026-07-23 16:50:49 |
| 208.63.128.0/24 | 3,459 | 2026-07-23 16:51:25 |
Frequently Asked Questions
What is AS19957?
AS19957 is an Autonomous System Number assigned to AT&T Enterprises, LLC. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS19957 announce?
AS19957 announces 276.7K IPv4 addresses distributed across 17 routed CIDR prefixes. The network is registered in United States.
Who operates AS19957?
AS19957 is operated by AT&T Enterprises, LLC. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS19957 registered in?
AS19957 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
