121.251.224.0/20
Origin history for this exact network block.
| From | Until | Origin ASN | Name at start |
|---|---|---|---|
| 2026-06-13 | Current | AS4538 | China Education and Research Network Center |
| 2026-06-13 | 2026-09-16 | AS138371 | CERNET2 regional IX at Ocean University of China |