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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 43.237.20.0/22 | 1k | APNIC |  CN | 15th Aug 2014 |
| 43.237.200.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.204.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.208.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.212.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.216.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.220.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.224.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.228.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.232.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.236.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.24.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.240.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.244.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.248.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.252.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.237.28.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.32.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.36.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.4.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.40.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.44.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.48.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.52.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.56.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.60.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.64.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.68.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.72.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.76.0/22 | 1k | APNIC | CN | 1st Aug 2014 |
| 43.237.8.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.80.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.84.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 43.237.88.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.92.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.96.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.238.0.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.100.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.104.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.108.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.112.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.116.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.12.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.120.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.124.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.128.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.132.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.136.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.140.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |
| 43.238.144.0/22 | 1k | APNIC | CN | 22nd Aug 2014 |