Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,041 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 163.52.40.0/23 | 512 | APNIC |  ID | 21st Aug 2026 |
| 163.52.42.0/23 | 512 | APNIC |  BD | 24th Aug 2026 |
| 163.52.44.0/24 | 256 | APNIC |  NP | 24th Aug 2026 |
| 163.52.45.0/24 | 256 | APNIC | ID | 26th Aug 2026 |
| 163.52.46.0/23 | 512 | APNIC |  IN | 24th Aug 2026 |
| 163.52.48.0/23 | 512 | APNIC |  TW | 24th Aug 2026 |
| 163.52.50.0/23 | 512 | APNIC |  MM | 24th Aug 2026 |
| 163.52.52.0/23 | 512 | APNIC |  AU | 25th Aug 2026 |
| 163.52.54.0/23 | 512 | APNIC |  PK | 25th Aug 2026 |
| 163.52.56.0/23 | 512 | APNIC | BD | 25th Aug 2026 |
| 163.52.58.0/23 | 512 | APNIC |  VN | 26th Aug 2026 |
| 163.52.6.0/23 | 512 | APNIC | VN | 17th Aug 2026 |
| 163.52.60.0/23 | 512 | APNIC | IN | 26th Aug 2026 |
| 163.52.62.0/23 | 512 | APNIC | IN | 26th Aug 2026 |
| 163.52.8.0/23 | 512 | APNIC | PK | 18th Aug 2026 |
| 163.53.0.0/22 | 1k | APNIC |  CN | 8th Jul 2014 |
| 163.53.100.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.104.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.108.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.112.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.116.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.12.0/22 | 1k | APNIC | CN | 8th Jul 2014 |
| 163.53.120.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.124.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.132.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.136.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.160.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.164.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.172.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 163.53.188.0/22 | 1k | APNIC | CN | 11th Jul 2014 |
| 163.53.228.0/22 | 1k | APNIC | AU | 14th Jul 2014 |
| 163.53.232.0/22 | 1k | APNIC | AU | 14th Jul 2014 |
| 163.53.240.0/22 | 1k | APNIC | CN | 14th Jul 2014 |
| 163.53.36.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.4.0/22 | 1k | APNIC | CN | 8th Jul 2014 |
| 163.53.40.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.48.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.52.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.56.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.64.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.53.68.0/22 | 1k | APNIC | AU | 9th Jul 2014 |
| 163.53.8.0/22 | 1k | APNIC | CN | 8th Jul 2014 |
| 163.53.96.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 163.56.0.0/16 | 65.5k | APNIC |  JP | 24th Jul 1992 |
| 163.60.0.0/16 | 65.5k | APNIC | JP | 24th Jul 1992 |
| 163.61.116.0/24 | 256 | APNIC |  SG | 12th Feb 2025 |
| 163.61.158.0/24 | 256 | APNIC | ID | 19th Feb 2025 |
| 163.61.160.128/26 | 64 | APNIC |  LA | 25th Jul 2025 |
| 163.61.160.64/26 | 64 | APNIC | BD | 17th Apr 2025 |
| 163.61.161.0/26 | 64 | APNIC |  HK | 8th Sept 2025 |