AS13821
AllianceBernstein L.P.
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
- Trust score 65 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 206.218.206.0/23 | 512 |
2.5%
|
AllianceBernstein L.P. | US | Tennessee | Nashville |
| 206.218.214.0/23 | 512 |
0.8%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.234.0/23 | 512 |
0.2%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.246.0/23 | 512 |
0.2%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.248.0/23 | 512 |
0.0%
|
AllianceBernstein L.P. | US | — | — |
| 103.216.134.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | AU | — | — |
| 165.101.85.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | JP | — | — |
| 206.218.209.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.213.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.223.0/24 | 256 |
2.7%
|
AllianceBernstein L.P. | US | New York | Katonah |
| 206.218.229.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.232.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | US | — | — |
| 206.218.240.0/24 | 256 |
0.0%
|
AllianceBernstein L.P. | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS13821 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 |
|---|---|---|
| 103.216.134.0/24 | 13,719 | 2026-08-01 12:59:37 |
| 206.218.240.0/24 | 11,886 | 2026-08-01 12:55:44 |
| 206.218.206.0/24 | 10,450 | 2026-08-01 12:54:26 |
| 206.218.207.0/24 | 10,418 | 2026-08-01 12:54:26 |
| 206.218.209.0/24 | 10,394 | 2026-08-01 12:54:26 |
| 206.218.248.0/24 | 9,827 | 2026-08-01 13:07:40 |
| 206.218.249.0/24 | 9,812 | 2026-08-01 12:56:26 |
| 206.218.246.0/23 | 7,002 | 2026-08-01 10:34:44 |
| 206.218.234.0/24 | 6,785 | 2026-08-01 08:50:56 |
| 206.218.215.0/24 | 6,572 | 2026-08-01 10:34:26 |
| 206.218.223.0/24 | 6,571 | 2026-08-01 13:08:01 |
| 206.218.213.0/24 | 6,515 | 2026-08-01 10:34:26 |
| 165.101.85.0/24 | 6,455 | 2026-08-01 13:07:33 |
| 206.218.214.0/24 | 6,243 | 2026-08-01 10:34:46 |
| 206.218.246.0/24 | 4,588 | 2026-07-10 23:24:40 |
| 206.218.229.0/24 | 4,385 | 2026-08-01 08:50:57 |
| 206.218.235.0/24 | 3,843 | 2026-08-01 08:50:57 |
| 206.218.232.0/24 | 3,842 | 2026-08-01 10:34:20 |
| 83.126.58.224/28 | 4 | 2026-07-12 13:52:23 |
Frequently Asked Questions
What is AS13821?
AS13821 is an Autonomous System Number assigned to AllianceBernstein L.P.. 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 AS13821 announce?
AS13821 announces 4.6K IPv4 addresses distributed across 13 routed CIDR prefixes. The network is registered in United States.
Who operates AS13821?
AS13821 is operated by AllianceBernstein L.P.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS13821 registered in?
AS13821 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
