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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.222.200.0/22 | 1k | APNIC |  CN | 3rd Jun 2016 |
| 103.222.204.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.208.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.212.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.220.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.224.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.228.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.232.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.238.0/24 | 256 | APNIC |  SG | 6th Jun 2016 |
| 103.222.24.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.240.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.244.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.28.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.36.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.4.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.44.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.48.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.52.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.56.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.60.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.64.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.68.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.72.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.76.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.8.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.80.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.84.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.88.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.92.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.96.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.223.100.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.104.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.108.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.112.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.116.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.124.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.128.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.138.0/23 | 512 | APNIC |  AU | 6th Jun 2016 |
| 103.223.140.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.16.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.160.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.164.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.168.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.172.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.176.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.180.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.188.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.192.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.196.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.20.0/22 | 1k | APNIC | CN | 5th Jun 2016 |