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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 43.238.148.0/22 | 1k | APNIC |  CN | 22nd Aug 2014 |
| 43.238.152.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.156.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.16.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.160.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.164.0/22 | 1k | APNIC | CN | 1st Aug 2014 |
| 43.238.168.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.172.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.176.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.180.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.184.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.188.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.192.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.196.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.20.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.200.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.204.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.208.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.212.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.216.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.220.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.224.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.228.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.232.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.236.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.24.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.240.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.244.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.248.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.252.0/22 | 1k | APNIC | CN | 23rd Aug 2014 |
| 43.238.28.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.32.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.36.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.4.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.40.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.44.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.48.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.52.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.56.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.60.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.64.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.68.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.72.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.76.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.8.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.80.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.84.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.88.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.92.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.96.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |