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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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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 |
|---|---|---|---|---|
| 43.236.244.0/22 | 1k | APNIC |  CN | 15th Aug 2014 |
| 43.236.248.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.252.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.28.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.32.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.36.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.4.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.40.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.44.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.48.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.52.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.56.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.60.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.64.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.68.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.72.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.76.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.8.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.80.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.84.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.88.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.92.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.96.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.237.0.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.100.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.104.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.108.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.112.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.116.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.12.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.120.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.124.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.128.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 43.237.132.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.136.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.140.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.144.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.148.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.152.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.156.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.16.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.237.160.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.164.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.168.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.172.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.176.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.180.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.184.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.188.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 43.237.192.0/22 | 1k | APNIC | CN | 21st Aug 2014 |