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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,584 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.253.12.0/22 | 1k | APNIC |  CN | 3rd Jun 2016 |
| 45.253.120.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.16.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.20.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.28.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.36.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.4.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.40.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.44.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.48.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.52.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.56.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.64.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.68.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.72.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.76.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.8.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.80.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.84.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.253.92.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 45.254.0.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.100.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.104.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.108.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.112.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.116.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.12.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.120.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.124.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.128.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.132.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.136.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.140.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.144.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.148.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.152.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.156.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.16.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.160.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.164.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.168.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.172.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.176.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.180.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.184.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.188.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.192.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.196.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.200.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 45.254.204.0/22 | 1k | APNIC | CN | 6th Jun 2016 |