AS4538
China Education and Research Network Center
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
- Academic allocation +6
- Trust score 59 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About China Education and Research Network
The China Education and Research Network is the first nationwide education and research computer network in China. The CERNET project is funded by the Chinese government and directly managed by the Chinese Ministry of Education.
⚠ 100+ MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS4538 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) |
|---|---|---|
| 121.250.135.0/24 | AS4538, AS141005 | 2026-07-22 00:08:16 |
| 202.115.64.0/20 | AS4538, AS24355 | 2026-07-22 00:08:16 |
| 211.69.0.0/16 | AS4538, AS24358 | 2026-07-22 00:08:16 |
| 219.229.0.0/16 | AS4538, AS24364 | 2026-07-22 00:08:16 |
| 202.112.10.0/24 | AS4538, AS24350 | 2026-07-22 00:08:16 |
| 202.112.56.0/24 | AS4538, AS24348 | 2026-07-22 00:08:16 |
| 202.117.80.0/20 | AS4538, AS24353 | 2026-07-22 00:08:16 |
| 58.207.0.0/16 | AS4538, AS24348 | 2026-07-22 00:08:16 |
| 183.173.0.0/16 | AS4538, AS24348 | 2026-07-22 00:08:16 |
| 103.252.172.0/22 | AS4538, AS133465 | 2026-07-22 00:08:16 |
| 202.112.50.0/24 | AS4538, AS24348 | 2026-07-22 00:08:16 |
| 218.199.0.0/16 | AS4538, AS24358 | 2026-07-22 00:08:16 |
| 121.251.208.0/21 | AS4538, AS141005 | 2026-07-22 00:08:16 |
| 219.244.160.0/19 | AS4538, AS24353 | 2026-07-22 00:08:16 |
| 121.250.208.0/20 | AS4538, AS24363 | 2026-07-22 00:08:16 |
Showing the 15 most recently detected of 100+ MOAS prefixes. Many multi-origin prefixes on large networks are benign (anycast); see all MOAS anomalies.
Network profile
Source: PeeringDB →AS4538 — global IP footprint
Cities where AS4538 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS4538 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 |
|---|---|---|
| 58.206.132.0/24 | 338,646 | 2026-07-22 00:05:37 |
| 202.38.64.0/19 | 330,268 | 2026-07-22 00:05:37 |
| 202.127.240.0/20 | 315,871 | 2026-07-22 00:06:01 |
| 222.17.0.0/16 | 252,250 | 2026-07-22 00:05:37 |
| 58.207.0.0/16 | 250,301 | 2026-07-22 00:05:37 |
| 210.32.128.0/18 | 230,693 | 2026-07-22 00:13:48 |
| 202.116.0.0/15 | 218,296 | 2026-07-22 00:05:52 |
| 202.118.0.0/15 | 218,220 | 2026-07-22 00:05:52 |
| 202.192.0.0/13 | 215,661 | 2026-07-21 23:07:12 |
| 202.121.0.0/16 | 214,469 | 2026-07-22 00:05:52 |
| 202.120.0.0/16 | 214,346 | 2026-07-22 00:05:52 |
| 202.118.0.0/16 | 212,831 | 2026-07-22 00:05:52 |
| 202.202.0.0/16 | 212,453 | 2026-07-21 23:07:33 |
| 202.193.0.0/16 | 212,088 | 2026-07-21 23:08:04 |
| 202.203.0.0/16 | 211,202 | 2026-07-21 23:08:18 |
| 222.205.0.0/16 | 207,837 | 2026-07-21 23:07:15 |
| 222.204.0.0/16 | 207,824 | 2026-07-21 23:07:15 |
| 125.217.0.0/16 | 177,831 | 2026-07-22 00:05:51 |
| 125.216.0.0/16 | 177,812 | 2026-07-22 00:05:51 |
| 125.218.0.0/16 | 177,585 | 2026-07-22 00:05:51 |
| 59.71.128.0/17 | 173,754 | 2026-07-22 00:05:51 |
| 202.113.0.0/16 | 173,378 | 2026-07-21 23:08:19 |
| 59.68.232.0/23 | 170,502 | 2026-07-22 00:05:51 |
| 113.54.128.0/17 | 170,398 | 2026-07-22 00:05:51 |
| 59.68.0.0/18 | 169,469 | 2026-07-22 00:05:51 |
| 202.112.0.0/24 | 169,416 | 2026-07-22 00:10:31 |
| 116.56.0.0/18 | 168,359 | 2026-07-22 00:05:51 |
| 59.69.64.0/18 | 168,311 | 2026-07-22 00:05:51 |
| 121.49.64.0/18 | 166,650 | 2026-07-22 00:05:51 |
| 59.69.0.0/19 | 165,200 | 2026-07-22 00:05:51 |
| 49.120.64.0/19 | 164,562 | 2026-07-22 00:05:51 |
| 59.69.32.0/19 | 164,466 | 2026-07-22 00:05:51 |
| 125.221.40.0/23 | 164,289 | 2026-07-22 00:05:51 |
| 59.68.160.0/21 | 164,215 | 2026-07-22 00:05:51 |
| 59.68.228.0/22 | 164,039 | 2026-07-22 00:05:51 |
| 125.221.10.0/23 | 163,829 | 2026-07-22 00:05:51 |
| 58.194.8.0/23 | 163,726 | 2026-07-22 00:05:51 |
| 183.168.0.0/18 | 163,567 | 2026-07-22 00:05:51 |
| 59.68.96.0/20 | 163,542 | 2026-07-22 00:05:51 |
| 59.69.64.0/20 | 163,510 | 2026-07-22 00:05:51 |
| 59.68.64.0/20 | 163,510 | 2026-07-22 00:05:51 |
| 59.68.192.0/22 | 163,486 | 2026-07-22 00:05:51 |
| 59.69.112.0/20 | 163,453 | 2026-07-22 00:05:51 |
| 59.68.84.0/22 | 163,365 | 2026-07-22 00:05:51 |
| 59.68.240.0/20 | 163,357 | 2026-07-22 00:05:51 |
| 59.69.104.0/21 | 163,325 | 2026-07-22 00:05:51 |
| 59.69.104.0/22 | 163,285 | 2026-07-22 00:05:51 |
| 110.65.0.0/18 | 163,255 | 2026-07-22 00:05:51 |
| 59.69.80.0/21 | 163,236 | 2026-07-22 00:05:51 |
| 59.69.108.0/22 | 163,225 | 2026-07-22 00:05:51 |
Showing top 50 of 5,348 announced prefixes by sample volume.
Frequently Asked Questions
What is AS4538?
AS4538 is an Autonomous System Number assigned to China Education and Research Network Center. 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 AS4538 announce?
AS4538 announces 17.13M IPv4 addresses distributed across 153 routed CIDR prefixes. The network is registered in China.
Who operates AS4538?
AS4538 is operated by China Education and Research Network Center. The organization is based in China. You can view all IP ranges and related ASNs on the organization page.
What country is AS4538 registered in?
AS4538 is registered in China. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
