101.5.128.0/21
Currently announced by AS4538 CERNET-CN, in the routed prefix 101.5.128.0/21.
- Current ASN
- AS4538
- CERNET-CN
- Routed prefix
- 101.5.128.0/21
- Most specific route covering this prefix
- ASNs over time
- 2
- 6 announcement records
- RIR allocation
- APNIC
- China · 101.4.0.0/14
Routing data · Nov 8, 2026, 10:26 UTC
ASN historyEvery routed prefix covering 101.5.128.0/21
| Prefix | ASN | Name | Registered country | First seen (UTC) | Last seen (UTC) | Status |
|---|---|---|---|---|---|---|
| 101.5.128.0/21 | AS4538 | CERNET-CN |  China | Before monitoring | 2026-11-08 10:26 | Announcing |
| 101.5.128.0/18 | AS4538 | CERNET-CN | China | 2026-11-02 14:22 | 2026-11-08 10:26 | Announcing |
| 101.5.128.0/17 | AS4538 | CERNET-CN | China | Before monitoring | 2026-11-08 10:26 | Announcing |
| 101.5.0.0/16 | AS4538 | CERNET-CN | China | Before monitoring | 2026-11-08 10:26 | Announcing |
| 101.5.0.0/16 | AS24348 | CERNET2 IX at Tsinghua University | China | Before monitoring | 2026-11-08 10:26 | Announcing |
| 101.4.0.0/14 | AS4538 | CERNET-CN | China | Before monitoring | 2026-11-08 10:26 | Announcing |
More specific routes0 total
No more specific routes inside this prefix.
Change logAll changes
| Detected (UTC) | Prefix | Change | ASN | Name | Previous ASN | Country |
|---|---|---|---|---|---|---|
| 2026-11-02 14:22 | 101.5.128.0/18 | New announcement | AS4538 | CERNET-CN | — | China |