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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 43.231.172.0/22 | 1k | APNIC |  CN | 15th Feb 2015 |
| 43.231.176.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 43.231.180.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 43.231.32.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 43.231.36.0/22 | 1k | APNIC | CN | 12th Feb 2015 |
| 43.231.80.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 43.231.84.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 43.231.88.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 43.231.92.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 43.236.0.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.100.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.104.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.108.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.112.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.116.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.12.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.120.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.124.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.128.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.132.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.136.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.140.0/22 | 1k | APNIC | CN | 14th Aug 2014 |
| 43.236.144.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.148.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.152.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.156.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.16.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.160.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.164.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.168.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.172.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.176.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.180.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.184.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.188.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.192.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.196.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.20.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.200.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.204.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.208.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.212.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.216.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.220.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.224.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.228.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.232.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.236.0/22 | 1k | APNIC | CN | 15th Aug 2014 |
| 43.236.24.0/22 | 1k | APNIC | CN | 12th Aug 2014 |
| 43.236.240.0/22 | 1k | APNIC | CN | 15th Aug 2014 |