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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.221.120.0/22 | 1k | APNIC |  CN | 1st Jun 2016 |
| 103.221.124.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.128.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.132.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.136.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.144.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.148.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.152.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.156.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.160.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.164.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.168.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.172.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.176.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.180.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.184.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.188.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.192.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.196.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.200.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.204.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.216.0/22 | 1k | APNIC |  VN | 1st Jun 2016 |
| 103.221.84.0/23 | 512 | APNIC |  AU | 1st Jun 2016 |
| 103.221.88.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.221.96.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 103.222.0.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.100.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.104.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.108.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.112.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.116.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.12.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.120.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.124.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.128.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.132.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.136.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.140.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.144.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.148.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.152.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.156.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.16.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.160.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.164.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.168.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.172.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.188.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.192.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |
| 103.222.196.0/22 | 1k | APNIC | CN | 3rd Jun 2016 |