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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.248.240.0/22 | 1k | APNIC |  CN | 9th May 2016 |
| 45.248.244.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.248.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.252.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.4.0/22 | 1k | APNIC |  IN | 29th Apr 2016 |
| 45.248.80.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 45.248.84.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 45.248.96.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 45.249.0.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.112.0/22 | 1k | APNIC | CN | 11th May 2016 |
| 45.249.12.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.136.0/22 | 1k | APNIC | IN | 11th May 2016 |
| 45.249.144.0/20 | 4.1k | APNIC | IN | 11th May 2016 |
| 45.249.16.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.180.0/23 | 512 | APNIC |  ID | 10th Aug 2026 |
| 45.249.182.0/23 | 512 | APNIC | ID | 10th Aug 2026 |
| 45.249.188.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 45.249.192.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 45.249.196.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 45.249.20.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.200.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 45.249.204.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 45.249.208.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 45.249.24.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.248.0/22 | 1k | APNIC | IN | 13th May 2016 |
| 45.249.28.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.32.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.36.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.4.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.249.60.0/23 | 512 | APNIC |  AU | 11th Aug 2026 |
| 45.249.62.0/24 | 256 | APNIC | AU | 11th Aug 2026 |
| 45.249.63.0/24 | 256 | APNIC |  HK | 12th Aug 2026 |
| 45.250.104.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.108.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.112.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.116.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.12.0/22 | 1k | APNIC | CN | 14th May 2016 |
| 45.250.120.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.124.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.128.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.132.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.136.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.140.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.144.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.148.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.16.0/22 | 1k | APNIC | CN | 14th May 2016 |
| 45.250.164.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.192.0/22 | 1k | APNIC | CN | 18th May 2016 |
| 45.250.204.0/22 | 1k | APNIC |  KR | 18th May 2016 |
| 45.250.28.0/22 | 1k | APNIC | CN | 16th May 2016 |