AS4538 China Education and Research Network Center
IPv4 addresses
17,173,248
IPv6 /48 networks
264
RPKI
962 valid2560 no ROA
Peers and downstreams
47
Holder
- AS name
- ERX-CERNET-BKB
- Description
- China Education and Research Network Center Tsinghua University Beijing 100084
- Organisation
- China Education and Research Network Center
- Abuse contact
- Not published
- Assigned
- 2002-07-31
- Registered
- 2008-09-04
- Record last changed
- 2025-10-31 08:14 UTC
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.0.0/16210.36.29.0/24210.37.0.0/16210.38.0.0/16210.38.108.0/24210.38.112.0/21210.38.128.0/20210.38.144.0/20210.38.240.0/20210.38.56.0/22210.38.60.0/22210.38.64.0/20210.38.96.0/20210.39.0.0/16210.39.104.0/22210.39.16.0/22210.39.240.0/23210.39.96.0/22210.40.0.0/18210.40.0.0/24210.40.1.0/24210.40.112.0/22210.40.112.0/24210.40.116.0/22210.40.128.0/19210.40.128.0/20210.40.128.0/24210.40.144.0/24210.40.160.0/20210.40.160.0/24210.40.176.0/20210.40.176.0/24210.40.192.0/18210.40.2.0/24210.40.208.0/21210.40.216.0/21210.40.216.0/24210.40.224.0/24210.40.240.0/21210.40.3.0/24210.40.32.0/20210.40.32.0/24210.40.6.0/24210.40.62.0/23210.40.63.0/24210.40.64.0/18210.40.64.0/24210.40.80.0/24210.41.0.0/22210.41.102.0/24210.41.112.0/21210.41.113.0/24210.41.114.0/24210.41.115.0/24210.41.126.0/23210.41.128.0/20210.41.152.0/21210.41.152.0/24210.41.16.0/22210.41.160.0/20210.41.176.0/21210.41.184.0/22210.41.188.0/22210.41.19.0/24210.41.192.0/20210.41.20.0/24210.41.208.0/21210.41.216.0/23210.41.218.0/23210.41.220.0/22210.41.224.0/20210.41.225.0/24210.41.226.0/24210.41.227.0/24210.41.228.0/24210.41.229.0/24210.41.230.0/24210.41.231.0/24210.41.232.0/24210.41.233.0/24210.41.240.0/20210.41.240.0/24210.41.241.0/24210.41.242.0/24210.41.243.0/24210.41.244.0/24210.41.245.0/24210.41.246.0/24210.41.248.0/24210.41.250.0/24210.41.251.0/24210.41.254.0/23210.41.254.0/24210.41.32.0/20210.41.32.0/24210.41.4.0/22210.41.5.0/24210.41.56.0/21210.41.64.0/21210.41.72.0/21210.41.8.0/21210.41.80.0/20210.41.96.0/20210.42.0.0/20210.42.112.0/20210.42.140.0/24210.42.141.0/24210.42.144.0/20210.42.144.0/24210.42.16.0/21210.42.160.0/20210.42.176.0/20210.42.176.0/23210.42.192.0/20210.42.192.0/24210.42.224.0/20210.42.24.0/21210.42.240.0/20210.42.32.0/20210.42.48.0/20210.42.64.0/22210.42.68.0/22210.42.68.0/24210.42.69.0/24210.42.70.0/24210.42.71.0/24210.42.72.0/21210.42.8.0/21210.42.88.0/22210.42.96.0/20210.43.0.0/20210.43.112.0/20210.43.128.0/20210.43.144.0/24210.43.147.0/24210.43.152.0/21210.43.152.0/24210.43.16.0/21210.43.160.0/20210.43.162.0/24210.43.176.0/20210.43.176.0/24210.43.192.0/20210.43.204.0/24210.43.208.0/20210.43.208.0/24210.43.224.0/20210.43.24.0/21210.43.240.0/21210.43.248.0/21210.43.32.0/21210.43.40.0/22210.43.44.0/22210.43.44.0/24210.43.48.0/20210.43.64.0/20210.43.64.0/24210.43.80.0/20210.43.96.0/20210.44.0.0/20210.44.208.0/20210.44.48.0/20210.45.0.0/16210.46.100.0/24210.46.112.0/20210.46.113.0/24210.46.122.0/24210.46.123.0/24210.46.127.0/24210.46.136.0/21210.46.144.0/21210.46.152.0/21210.46.176.0/20210.46.192.0/21210.46.216.0/21210.46.248.0/21210.46.48.0/21210.46.50.0/24210.46.64.0/20210.46.8.0/21210.46.80.0/20210.46.96.0/20210.46.97.0/24210.47.0.0/16210.47.0.0/21210.47.1.0/24210.47.10.0/23210.47.100.0/23210.47.104.0/21210.47.112.0/20210.47.12.0/22210.47.128.0/20210.47.144.0/22210.47.148.0/22210.47.16.0/20210.47.160.0/20210.47.176.0/20210.47.192.0/20210.47.208.0/20210.47.224.0/20210.47.228.0/24210.47.229.0/24210.47.240.0/20210.47.243.0/24210.47.250.0/24210.47.32.0/20210.47.56.0/21210.47.64.0/20210.47.7.0/24210.47.98.0/23211.64.0.0/13211.64.128.0/20211.64.128.0/24211.64.129.0/24211.64.130.0/24211.64.142.0/24211.64.143.0/24211.64.144.0/20211.64.144.0/24211.64.145.0/24211.64.148.0/24211.64.150.0/23211.64.152.0/21211.64.160.0/19211.64.192.0/20211.64.208.0/20211.65.0.0/16211.66.0.0/16211.66.0.0/20211.66.112.0/20211.66.128.0/20211.66.152.0/21211.66.16.0/20211.66.160.0/20211.66.186.0/24211.66.188.0/24211.66.192.0/21211.66.206.0/23211.66.208.0/22211.66.216.0/21211.66.240.0/21211.66.248.0/21211.66.72.0/23211.66.82.0/24211.66.86.0/23211.66.96.0/20211.67.0.0/16211.67.0.0/20211.67.102.0/24211.67.112.0/20211.67.124.0/24211.67.128.0/20211.67.144.0/20211.67.16.0/20211.67.160.0/21211.67.163.0/24211.67.166.0/24211.67.168.0/21211.67.176.0/21211.67.184.0/21211.67.184.0/24211.67.208.0/20211.67.224.0/22211.67.232.0/21211.67.32.0/20211.67.41.0/24211.67.48.0/20211.67.49.0/24211.67.64.0/20211.67.8.0/21211.67.80.0/21211.67.88.0/21211.67.96.0/20211.68.0.0/20211.68.112.0/21211.68.120.0/24211.68.121.0/24211.68.122.0/24211.68.123.0/24211.68.128.0/18211.68.130.0/23211.68.136.0/23211.68.144.0/20211.68.176.0/20211.68.192.0/18211.68.192.0/20211.68.208.0/20211.68.224.0/21211.68.23.0/24211.68.232.0/23211.68.236.0/22211.68.240.0/20211.68.32.0/20211.68.64.0/22211.68.66.0/24211.68.68.0/22211.68.71.0/24211.68.72.0/21211.68.80.0/21211.68.94.0/24211.68.95.0/24211.68.96.0/20211.68.96.0/24211.68.97.0/24211.69.0.0/16211.69.0.0/20211.69.1.0/24211.69.104.0/21211.69.104.0/24211.69.128.0/20211.69.128.0/24211.69.144.0/20211.69.16.0/20211.69.160.0/20211.69.167.0/24211.69.192.0/20211.69.208.0/21211.69.208.0/24211.69.216.0/21211.69.224.0/20211.69.240.0/20211.69.32.0/20211.69.32.0/24211.69.42.0/24211.69.48.0/23211.69.50.0/23211.69.52.0/22211.69.64.0/21211.69.72.0/21211.69.72.0/24211.69.75.0/24211.69.80.0/20211.69.96.0/23211.71.0.0/20211.71.128.0/20211.71.144.0/20211.71.15.0/24211.71.16.0/20211.71.160.0/20211.71.160.0/24211.71.163.0/24211.71.184.0/21211.71.192.0/20211.71.208.0/20
| AS9405 | Test platform Service Center TPS-CN-AS |
| AS23910 | China Next Generation Internet CERNET2 CNGI-CERNET2-AS-AP |
| AS23911 | China Next Generation Internet Beijing IX CNGI-BJIX-AS-AP |
| AS24310 | Net-Glyph Data Center NGDC-AS-AP |
| AS24348 | CERNET2 IX at Tsinghua University CNGI-BJ-IX2-AS-AP |
| AS24349 | CERNET2 IX at Peking University CNGI-BJ-IX3-AS-AP |
| AS24352 | CERNET2 IX at Tianjin University CNGI-TJN-IX-AS-AP |
| AS24353 | CERNET2 IX at Xi'an Jiaotong University CNGI-XA-IX-AS-AP |
| AS24357 | CERNET2 IX at South China University of Technology CNGI-GZ-IX-AS-AP |
| AS24358 | CERNET2 IX at Huazhong University of Science and Technology CNGI-WH-IX-AS-AP |
| AS24361 | CERNET2 IX at Southeast University CNGI-NJ-IX-AS-AP |
| AS24364 | CERNET2 IX at Shanghai Jiaotong University CNGI-SH-IX-AS-AP |
| AS24369 | CERNET2 IX at Northeast University CNGI-SY-IX-AS-AP |
| AS24371 | CERNET2 IX at Jilin University CNGI-CHC-IX-AS-AP |
| AS131578 | Beijing Foreign Studies University BFSUNET |
| AS133111 | CERNET New Technology Co., Ltd CNT-northChina |
| AS133465 | Duke Kunshan University DKU-AS-AP |
| AS133475 | New York University ASN NEWYORKUNIVERSITY-AS-SHANGHAI |
| AS134169 | CERNEWTECH (Beijing) co.,LTD CERNEWTECHRES-AS-CN |
| AS138441 | CERNET2 regional IX at Xinjiang University CNGI-WLQ-IX-AS-AP |
| AS139139 | Shenyang Agricultural University SYAUNET |
| AS151229 | Shenyang Aerospace University SAUNET |
| AS1299 | Arelion Sweden AB TWELVE99 |
| AS3491 | PCCW Global (HK) Ltd. PCCWG-APAC-HK |
| AS4134 | No.31,Jin-rong Street CHINANET-BACKBONE |
| AS4635 | Hong Kong Internet Exchange--Route Server 1 HKIX-RS1 |
| AS4837 | CHINA UNICOM China169 Backbone CHINA169-Backbone |
| AS7473 | Singapore Telecommunications Ltd SINGTEL-AS-AP |
| AS7497 | Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS) CSTNET-AS-AP |
| AS7660 | Asia Pacific Advanced Network - Japan APAN-JP |
| AS8359 | MTS PJSC MTS |
| AS9304 | HGC Global Communications Limited HUTCHISON-AS-AP |
| AS9808 | China Mobile Communications Group Co., Ltd. CHINAMOBILE-CN |
| AS9930 | TIME dotCom Berhad No. 14, Jalan Majistret U1/26 Hicom Glenmarie Industrial Park 40150 Shah Alam Selangor, Malaysia TTNET-MY |
| AS15412 | Flag Telecom UK Limited FLAG-AS |
| AS20965 | GEANT Vereniging GEANT |
| AS23764 | CTGNet |
| AS23855 | Singapore Advanced Research and Education Network SINGAREN-GIX-AS-AP |
| AS23910 | China Next Generation Internet CERNET2 CNGI-CERNET2-AS-AP |
| AS23911 | China Next Generation Internet Beijing IX CNGI-BJIX-AS-AP |
| AS24482 | SG.GS SGGS-AS-AP |
| AS36236 | NetActuate, Inc NETACTUATE |
| AS39120 | Convergenze S.p.A. CONVERGENZE-AS |
| AS41095 | IPTP LTD IPTP |
| AS49544 | i3D.net B.V i3Dnet |
| AS58453 | China Mobile International Limited CMI-INT-HK |
| AS140570 | Hong Kong Beecloud System Technology Services Limited HKBCS-AS-AP |
Upstream graph
Upstreams and their upstreams, from BGP pathsNetwork health
Grade C · 72/100| partly | Prefixes covered by valid ROAs 962 of 3522 announced prefixes are RPKI valid, 2560 have no ROA. |
7/25 |
| pass | No RPKI invalid announcements None of the announcements is RPKI invalid. |
10/10 |
| pass | Announces IPv6 9 IPv6 prefixes. |
15/15 |
| pass | More than one upstream 4 upstreams seen in BGP. |
10/10 |
| pass | Working abuse contact abuse@cernet.edu.cn is published. |
15/15 |
| fail | Publishes a geofeed No geofeed found. Without one, location databases have to guess. |
0/10 |
| pass | No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger. |
10/10 |
| pass | Registry record maintained Last changed 2025-10-31. |
5/5 |
Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.
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<a href="https://ip-fd.net/asn/4538"><img src="https://ip-fd.net/badge/asn/4538/health.svg" alt="AS4538 network health on IP-FD.net"></a>
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[](https://ip-fd.net/asn/4538)
Use rpki.svg instead of health.svg for the RPKI badge.
Routing changes
Last 30 days| 2026-10-04 14:59 UTC | Neighbour gone | AS138378 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS138371 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS138369 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS24372 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS24370 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS24363 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS24362 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS24355 | downstream |
| 2026-10-04 14:59 UTC | Neighbour gone | AS24350 | downstream |
| 2026-10-04 14:59 UTC | New neighbour | AS133475 | downstream |
| 2026-10-04 14:59 UTC | Relationship changed | AS9930 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS9808 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS9304 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS8359 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS7660 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS7497 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS7473 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS58453 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS4837 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS4635 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS4134 | upstream to peer |
| 2026-10-04 14:59 UTC | New neighbour | AS41095 | peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS39120 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS3491 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS23855 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS23764 | upstream to peer |
| 2026-10-04 14:59 UTC | New neighbour | AS20965 | peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS15412 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS140570 | upstream to peer |
| 2026-10-04 14:59 UTC | Relationship changed | AS1299 | upstream to peer |
| 2026-10-04 14:59 UTC | Prefix gone | 219.229.128.0/24 | |
| 2026-10-04 14:59 UTC | Prefix gone | 111.186.252.0/24 | |
| 2026-10-04 14:59 UTC | New prefix | 210.34.216.0/22 | |
| 2026-10-04 14:59 UTC | New prefix | 111.115.120.0/21 | |
| 2026-10-04 14:59 UTC | New prefix | 210.44.0.0/20 | |
| 2026-10-04 14:59 UTC | New prefix | 59.77.0.0/16 |
WHOIS
aut-num: AS4538 as-name: ERX-CERNET-BKB handle: AS4538 remarks: China Education and Research Network Center remarks: Tsinghua University remarks: Beijing 100084 remarks: This aut-num object created as part of remarks: the ER-Transfer from ARIN technical,administrative:CER-AP (CERNET Helpdesk) <helpdesk@cernet.edu.cn> abuse: IRT-CERNET-AP (IRT-CERNET-AP) <abuse@cernet.edu.cn> registration: 2008-09-04T06:40:34Z last changed: 2025-10-31T08:14:57Z source: APNIC (RDAP)