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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.121.252.0/22 | 1k | APNIC |  CN | 6th Jul 2015 |
| 45.121.4.0/22 | 1k | APNIC |  IN | 24th Jun 2015 |
| 45.121.52.0/22 | 1k | APNIC | CN | 29th Jun 2015 |
| 45.121.64.0/22 | 1k | APNIC | CN | 29th Jun 2015 |
| 45.121.68.0/22 | 1k | APNIC | CN | 29th Jun 2015 |
| 45.121.72.0/22 | 1k | APNIC | CN | 29th Jun 2015 |
| 45.121.76.0/22 | 1k | APNIC | IN | 29th Jun 2015 |
| 45.121.8.0/21 | 2k | APNIC | IN | 24th Jun 2015 |
| 45.121.92.0/22 | 1k | APNIC | CN | 29th Jun 2015 |
| 45.122.0.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.104.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.108.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.112.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.116.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.12.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.124.0/22 | 1k | APNIC | IN | 9th Jul 2015 |
| 45.122.128.0/22 | 1k | APNIC | IN | 9th Jul 2015 |
| 45.122.140.0/22 | 1k | APNIC | IN | 9th Jul 2015 |
| 45.122.144.0/22 | 1k | APNIC | IN | 9th Jul 2015 |
| 45.122.148.0/22 | 1k | APNIC | IN | 9th Jul 2015 |
| 45.122.152.0/22 | 1k | APNIC | IN | 9th Jul 2015 |
| 45.122.16.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.160.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.164.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.168.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.172.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.176.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.180.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.184.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.188.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.192.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.196.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.20.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.200.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.204.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.208.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.212.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.216.0/22 | 1k | APNIC | CN | 10th Jul 2015 |
| 45.122.24.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.28.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.32.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.36.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.4.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.40.0/22 | 1k | APNIC | CN | 6th Jul 2015 |
| 45.122.60.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.64.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.68.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.72.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.76.0/22 | 1k | APNIC | CN | 8th Jul 2015 |
| 45.122.8.0/22 | 1k | APNIC | CN | 6th Jul 2015 |