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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.238.176.0/22 | 1k | APNIC |  CN | 25th Jul 2014 |
| 103.238.180.0/22 | 1k | APNIC | CN | 25th Jul 2014 |
| 103.238.195.0/24 | 256 | APNIC |  AU | 30th Jul 2014 |
| 103.238.196.0/22 | 1k | APNIC | CN | 25th Jul 2014 |
| 103.238.20.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.24.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.244.0/22 | 1k | APNIC |  JP | 29th Jul 2014 |
| 103.238.248.0/22 | 1k | APNIC |  KR | 29th Jul 2014 |
| 103.238.252.0/22 | 1k | APNIC | CN | 29th Jul 2014 |
| 103.238.28.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.32.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.36.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.40.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.56.0/22 | 1k | APNIC | CN | 20th Jul 2014 |
| 103.238.76.0/22 | 1k | APNIC |  VN | 21st Jul 2014 |
| 103.238.88.0/22 | 1k | APNIC | CN | 22nd Jul 2014 |
| 103.238.92.0/22 | 1k | APNIC | CN | 22nd Jul 2014 |
| 103.239.106.0/23 | 512 | APNIC | AU | 5th Aug 2014 |
| 103.239.150.0/23 | 512 | APNIC |  PH | 19th Jul 2023 |
| 103.239.156.0/22 | 1k | APNIC | CN | 6th Aug 2014 |
| 103.239.166.0/23 | 512 | APNIC | AU | 7th Aug 2014 |
| 103.239.180.0/22 | 1k | APNIC | CN | 7th Aug 2014 |
| 103.239.196.0/22 | 1k | APNIC | CN | 7th Aug 2014 |
| 103.239.208.0/22 | 1k | APNIC | CN | 7th Aug 2014 |
| 103.239.228.0/22 | 1k | APNIC |  NZ | 8th Aug 2014 |
| 103.239.232.0/24 | 256 | ARIN |  US | 13th Nov 2024 |
| 103.239.236.0/22 | 1k | APNIC | KR | 8th Aug 2014 |
| 103.239.44.0/22 | 1k | APNIC | CN | 31st Jul 2014 |
| 103.239.60.0/22 | 1k | APNIC |  TW | 31st Jul 2014 |
| 103.239.72.0/22 | 1k | APNIC |  SG | 1st Aug 2014 |
| 103.239.78.0/24 | 256 | APNIC |  IN | 1st Aug 2014 |
| 103.24.128.0/22 | 1k | APNIC | CN | 16th Apr 2013 |
| 103.24.144.0/22 | 1k | APNIC | CN | 17th Apr 2013 |
| 103.24.164.0/22 | 1k | APNIC | SG | 17th Apr 2013 |
| 103.24.184.0/22 | 1k | APNIC | CN | 19th Apr 2013 |
| 103.24.194.0/23 | 512 | APNIC | JP | 22nd Apr 2013 |
| 103.24.198.0/23 | 512 | APNIC |  ID | 25th Oct 2022 |
| 103.24.220.0/22 | 1k | APNIC | CN | 23rd Apr 2013 |
| 103.24.224.0/23 | 512 | APNIC | ID | 25th Oct 2022 |
| 103.24.24.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.24.244.0/22 | 1k | APNIC | VN | 23rd Apr 2013 |
| 103.24.252.0/22 | 1k | APNIC | CN | 24th Apr 2013 |
| 103.24.36.0/22 | 1k | APNIC | IN | 10th Apr 2013 |
| 103.24.46.0/24 | 256 | APNIC | IN | 10th Apr 2013 |
| 103.24.76.0/24 | 256 | APNIC | ID | 11th Apr 2013 |
| 103.24.90.0/23 | 512 | APNIC | VN | 25th Oct 2022 |
| 103.240.172.0/22 | 1k | APNIC | CN | 16th Aug 2013 |
| 103.240.188.0/22 | 1k | APNIC | CN | 29th Jun 2016 |
| 103.240.202.0/23 | 512 | APNIC | CN | 24th Jul 2023 |
| 103.240.26.0/23 | 512 | APNIC | IN | 20th Jul 2023 |