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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.235.21.0/24 | 256 | APNIC |  ID | 1st Jul 2014 |
| 103.235.216.0/22 | 1k | APNIC |  HK | 14th Sept 2016 |
| 103.235.24.0/22 | 1k | APNIC |  KR | 1st Jul 2014 |
| 103.235.36.0/22 | 1k | APNIC |  AU | 2nd Jul 2014 |
| 103.235.48.0/22 | 1k | APNIC |  CN | 2nd Jul 2014 |
| 103.235.56.0/22 | 1k | APNIC | CN | 2nd Jul 2014 |
| 103.235.60.0/22 | 1k | APNIC | CN | 2nd Jul 2014 |
| 103.235.64.0/24 | 256 | APNIC |  IN | 2nd Jul 2014 |
| 103.235.80.0/22 | 1k | APNIC | CN | 3rd Jul 2014 |
| 103.236.0.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.119.0/24 | 256 | APNIC |  SG | 14th Aug 2015 |
| 103.236.12.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.124.0/22 | 1k | APNIC | IN | 12th Aug 2015 |
| 103.236.156.0/22 | 1k | APNIC | IN | 26th Aug 2015 |
| 103.236.16.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.164.0/22 | 1k | APNIC | IN | 26th Aug 2015 |
| 103.236.168.0/22 | 1k | APNIC | IN | 26th Aug 2015 |
| 103.236.184.0/22 | 1k | APNIC | CN | 27th Aug 2015 |
| 103.236.20.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.204.0/22 | 1k | APNIC | IN | 28th Aug 2015 |
| 103.236.208.0/22 | 1k | APNIC | IN | 28th Aug 2015 |
| 103.236.220.0/22 | 1k | APNIC | CN | 1st Sept 2015 |
| 103.236.232.0/22 | 1k | APNIC | CN | 1st Sept 2015 |
| 103.236.236.0/22 | 1k | APNIC | IN | 1st Sept 2015 |
| 103.236.24.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.240.0/22 | 1k | APNIC | CN | 2nd Sept 2015 |
| 103.236.28.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.32.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.36.0/22 | 1k | APNIC | CN | 11th Jul 2014 |
| 103.236.4.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.236.40.0/22 | 1k | APNIC | CN | 11th Jul 2014 |
| 103.236.44.0/22 | 1k | APNIC | CN | 11th Jul 2014 |
| 103.236.48.0/22 | 1k | APNIC | CN | 11th Jul 2014 |
| 103.236.8.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.237.0.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 103.237.12.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 103.237.135.0/24 | 256 | APNIC | IN | 16th Jul 2014 |
| 103.237.152.0/22 | 1k | APNIC | CN | 16th Jul 2014 |
| 103.237.24.0/22 | 1k | APNIC | CN | 10th Jul 2014 |
| 103.237.252.0/22 | 1k | APNIC | CN | 18th Jul 2014 |
| 103.237.4.0/22 | 1k | APNIC | CN | 9th Jul 2014 |
| 103.237.44.0/22 | 1k | RIPE NCC |  LV | 10th Jul 2014 |
| 103.237.48.0/23 | 512 | APNIC |  TW | 11th Jul 2023 |
| 103.237.68.0/22 | 1k | APNIC | CN | 16th Jul 2014 |
| 103.237.86.0/23 | 512 | APNIC |  VN | 12th Jul 2023 |
| 103.237.88.0/22 | 1k | APNIC | CN | 14th Jul 2014 |
| 103.238.152.0/23 | 512 | APNIC | CN | 14th Jul 2023 |
| 103.238.164.0/22 | 1k | APNIC | CN | 25th Jul 2014 |
| 103.238.168.0/22 | 1k | APNIC | CN | 25th Jul 2014 |
| 103.238.172.0/22 | 1k | APNIC | CN | 25th Jul 2014 |