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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.223.200.0/22 | 1k | APNIC |  CN | 6th Jun 2016 |
| 103.223.204.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.208.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.212.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.216.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.220.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.224.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.228.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.232.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.236.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.24.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.240.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.244.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.248.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.252.0/22 | 1k | APNIC | CN | 6th Jun 2016 |
| 103.223.28.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.32.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.36.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.4.0/22 | 1k | APNIC |  VN | 3rd Jun 2016 |
| 103.223.40.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.44.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.48.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.52.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.56.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.60.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.64.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.68.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.72.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.76.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.80.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.84.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.88.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.92.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.223.96.0/22 | 1k | APNIC | CN | 5th Jun 2016 |
| 103.224.0.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.224.140.0/23 | 512 | APNIC |  ID | 20th Jan 2014 |
| 103.224.143.0/24 | 256 | APNIC |  JP | 21st Jan 2014 |
| 103.224.163.0/24 | 256 | APNIC |  AU | 31st Jan 2014 |
| 103.224.176.0/22 | 1k | APNIC | ID | 23rd Jan 2014 |
| 103.224.204.0/22 | 1k | APNIC |  TW | 24th Jan 2014 |
| 103.224.220.0/22 | 1k | APNIC | CN | 26th Jan 2014 |
| 103.224.224.0/22 | 1k | APNIC | CN | 26th Jan 2014 |
| 103.224.236.0/22 | 1k | APNIC |  IN | 27th Jan 2014 |
| 103.224.248.0/22 | 1k | APNIC |  HK | 28th Jan 2014 |
| 103.224.40.0/22 | 1k | APNIC | CN | 10th Jan 2014 |
| 103.224.44.0/22 | 1k | APNIC | CN | 10th Jan 2014 |
| 103.224.50.0/23 | 512 | APNIC | IN | 10th Jan 2014 |
| 103.224.56.0/22 | 1k | APNIC | HK | 13th Jan 2014 |
| 103.224.60.0/22 | 1k | APNIC | CN | 13th Jan 2014 |
| 103.224.74.0/23 | 512 | APNIC |  SG | 3rd Oct 2023 |