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
- Active-threat / abuse risk −12
- Isp allocation +5
- Trust score 58 / 100
Experimental · trust-vectors model v1.2.1 — 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.
⚠ 11 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS3423 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 165.224.134.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 157.96.86.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 157.96.85.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 165.224.128.0/23 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 157.96.84.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 165.224.130.0/23 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 165.224.132.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 12.96.43.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 165.224.136.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 12.96.44.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
| 165.224.140.0/24 | AS3423, AS4186 | 2026-10-16 15:44:21 |
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 165.224.128.0/22 | 1.0K |
5.2%
|
AT&T Enterprises, LLC | US | Virginia | Woodbridge |
| 157.96.84.0/23 | 512 |
0.0%
|
AT&T Enterprises, LLC | US | Maryland | Havre de Grace |
| 12.96.43.0/24 | 256 |
0.8%
|
AT&T Enterprises, LLC | US | — | — |
| 12.96.44.0/24 | 256 |
0.0%
|
AT&T Enterprises, LLC | US | — | — |
| 157.96.86.0/24 | 256 |
0.0%
|
AT&T Enterprises, LLC | US | — | — |
| 165.224.132.0/24 | 256 |
0.4%
|
AT&T Enterprises, LLC | US | — | — |
| 165.224.134.0/24 | 256 |
0.4%
|
AT&T Enterprises, LLC | US | — | — |
| 165.224.136.0/24 | 256 |
0.0%
|
AT&T Enterprises, LLC | US | — | — |
| 165.224.140.0/24 | 256 |
0.0%
|
AT&T Enterprises, LLC | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS3423 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 |
|---|---|---|
| 12.96.43.0/24 | 29,247 | 2026-10-16 15:05:48 |
| 165.224.132.0/24 | 27,879 | 2026-10-16 15:05:48 |
| 12.96.44.0/24 | 27,804 | 2026-10-16 15:05:48 |
| 165.224.136.0/24 | 27,389 | 2026-10-16 15:05:48 |
| 165.224.130.0/23 | 27,378 | 2026-10-16 15:05:48 |
| 165.224.140.0/24 | 27,340 | 2026-10-16 15:05:48 |
| 165.224.134.0/24 | 27,327 | 2026-10-16 15:05:48 |
| 165.224.128.0/23 | 27,323 | 2026-10-16 15:05:48 |
| 157.96.84.0/24 | 25,976 | 2026-10-16 15:05:48 |
| 157.96.86.0/24 | 25,950 | 2026-10-16 15:05:48 |
| 157.96.85.0/24 | 25,931 | 2026-10-16 15:05:48 |
Frequently Asked Questions
What is AS3423?
AS3423 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 AS3423 announce?
AS3423 announces 3.3K IPv4 addresses distributed across 9 routed CIDR prefixes. The network is registered in United States.
Who operates AS3423?
AS3423 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 AS3423 registered in?
AS3423 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
