Summary
| ASN | AS17816 China Unicom |
| BGP | 221.4.0.0/16 |
| Registry | APNIC |
| Country | CN |
| Status | assigned |
| IP Version | IPv4 |
| Allocated | 2003-01-08 |
| Last Updated | 2026-08-26 |
| 221.4.8.0/24 | N/A | 0 | 1 | 1 |
| 221.4.9.0/24 | N/A | 0 | 1 | 1 |
| 221.4.10.0/24 | N/A | 0 | 1 | 1 |
| 221.4.11.0/24 | N/A | 0 | 1 | 1 |
| 221.4.32.0/24 | N/A | 0 | 1 | 2 |
| 221.4.33.0/24 | N/A | 0 | 1 | 1 |
| 221.4.40.0/24 | N/A | 0 | 1 | 2 |
| 221.4.41.0/24 | N/A | 0 | 1 | 1 |
| 221.4.42.0/24 | N/A | 0 | 1 | 1 |
| 221.4.48.0/24 | N/A | 0 | 1 | 1 |
| 221.4.54.0/24 | N/A | 0 | 1 | 1 |
| 221.4.61.0/24 | N/A | 0 | 1 | 1 |
| 221.4.66.0/24 | N/A | 0 | 1 | 1 |
| 221.4.102.0/24 | N/A | 0 | 1 | 1 |
| 221.4.104.0/24 | N/A | 0 | 1 | 1 |
| 221.4.106.0/24 | N/A | 0 | 1 | 1 |
| 221.4.112.0/24 | N/A | 0 | 1 | 1 |
| 221.4.146.0/24 | N/A | 0 | 1 | 1 |
| 221.4.154.0/24 | N/A | 0 | 1 | 1 |
| 221.4.156.0/24 | N/A | 0 | 1 | 1 |
| 221.4.159.0/24 | N/A | 0 | 1 | 1 |
| 221.4.173.0/24 | N/A | 0 | 1 | 1 |
| 221.4.175.0/24 | N/A | 0 | 1 | 1 |
| 221.4.222.0/24 | N/A | 0 | 1 | 1 |