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
- Multiple-origin (MOAS) routing anomaly −12
- Trust score 53 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
⚠ 4 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS17428 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) |
|---|---|---|
| 120.132.181.0/24 | AS9308, AS17428 | 2026-07-18 12:37:44 |
| 120.132.241.0/24 | AS17428, AS58466 | 2026-07-18 12:37:44 |
| 120.132.146.0/24 | AS17428, AS58466 | 2026-07-18 12:37:44 |
| 120.132.177.0/24 | AS17428, AS58466 | 2026-07-18 12:37:44 |
Network profile
Source: PeeringDB →Present at 2 internet exchanges: CNIX, CNIX (Qianhai, Shenzhen)
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 120.133.240.0/20 | 4.1K |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
| 120.132.224.0/21 | 2.0K |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
| 103.253.204.0/22 | 1.0K |
0.1%
|
21Vianet.Co.,Ltd | CN | — | — |
| 211.148.20.0/22 | 1.0K |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
| 211.148.18.0/23 | 512 |
0.6%
|
21Vianet.Co.,Ltd | CN | — | — |
| 211.148.24.0/23 | 512 |
0.4%
|
21Vianet.Co.,Ltd | CN | — | — |
| 211.148.30.0/23 | 512 |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
| 182.175.127.0/24 | 256 |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
| 211.148.17.0/24 | 256 |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
| 211.148.27.0/24 | 256 |
0.0%
|
21Vianet.Co.,Ltd | CN | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS17428 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 |
|---|---|---|
| 120.133.252.0/22 | 16,424 | 2026-07-18 12:00:53 |
| 120.133.248.0/22 | 16,220 | 2026-07-18 12:00:46 |
| 211.148.20.0/22 | 16,148 | 2026-07-18 12:00:46 |
| 120.132.224.0/21 | 16,115 | 2026-07-18 12:00:46 |
| 120.133.240.0/22 | 16,109 | 2026-07-18 12:00:46 |
| 211.148.17.0/24 | 16,050 | 2026-07-18 12:00:46 |
| 120.133.240.0/21 | 16,046 | 2026-07-18 12:00:46 |
| 120.132.231.0/24 | 16,037 | 2026-07-18 12:00:46 |
| 211.148.24.0/23 | 16,036 | 2026-07-18 12:00:46 |
| 120.132.224.0/23 | 16,020 | 2026-07-18 12:00:46 |
| 120.132.230.0/23 | 15,984 | 2026-07-18 12:00:46 |
| 120.132.224.0/24 | 15,980 | 2026-07-18 12:00:46 |
| 211.148.18.0/23 | 15,951 | 2026-07-18 12:00:46 |
| 120.132.228.0/23 | 15,893 | 2026-07-18 12:00:46 |
| 211.148.27.0/24 | 15,740 | 2026-07-18 12:00:46 |
| 103.253.204.0/22 | 14,923 | 2026-07-18 12:37:57 |
| 182.175.127.0/24 | 5,671 | 2026-07-18 10:52:26 |
| 211.148.30.0/23 | 3,898 | 2026-07-18 12:00:46 |
| 211.148.20.0/23 | 3,881 | 2026-07-18 12:00:46 |
| 211.148.22.0/24 | 3,875 | 2026-07-18 12:00:46 |
| 120.132.241.0/24 | 760 | 2026-07-18 08:10:38 |
| 120.132.146.0/24 | 760 | 2026-07-18 08:10:38 |
| 120.132.177.0/24 | 755 | 2026-07-18 08:10:38 |
| 120.133.236.0/22 | 566 | 2026-07-18 05:37:52 |
| 120.132.226.0/23 | 559 | 2026-07-18 05:37:52 |
| 120.132.240.0/23 | 16 | 2026-07-14 21:34:40 |
| 120.132.181.0/24 | 10 | 2026-07-14 21:34:40 |
| 120.132.240.0/24 | 10 | 2026-07-14 21:34:40 |
| 120.132.178.0/24 | 10 | 2026-07-14 21:34:40 |
Frequently Asked Questions
What is AS17428?
AS17428 is an Autonomous System Number assigned to 21Vianet.Co.,Ltd. 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 AS17428 announce?
AS17428 announces 10.5K IPv4 addresses distributed across 10 routed CIDR prefixes. The network is registered in China.
Who operates AS17428?
AS17428 is operated by 21Vianet.Co.,Ltd. The organization is based in China. You can view all IP ranges and related ASNs on the organization page.
What country is AS17428 registered in?
AS17428 is registered in China. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
