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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.254.88.0/22 | 1k | APNIC |  CN | 6th Jun 2016 |
| 45.254.92.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.96.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.255.0.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.100.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.104.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.108.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.112.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.116.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.12.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.120.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.136.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.140.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.144.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.148.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.156.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.16.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.160.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.164.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.168.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.172.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.176.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.180.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.184.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.188.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.192.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.196.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.20.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.200.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.204.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.208.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.212.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.216.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.220.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.224.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.228.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.232.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.236.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.24.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.240.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.244.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.248.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.28.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.32.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.36.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.4.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.40.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.44.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.48.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.52.0/22 | 1k | APNIC | CN | 7th Jun 2016 |