121.251.88.0/21
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 | AS24362 | CERNET2 IX at University of Science and Technology of China |