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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,778 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.148.91.0/24 | 256 | APNIC |  ID | 10th Feb 2020 |
| 103.149.103.0/24 | 256 | APNIC |  IN | 12th Mar 2020 |
| 103.149.108.0/23 | 512 | APNIC |  AU | 12th Mar 2020 |
| 103.149.110.0/23 | 512 | APNIC |  TW | 12th Mar 2020 |
| 103.149.134.0/23 | 512 | APNIC |  VN | 19th Aug 2022 |
| 103.149.138.0/23 | 512 | APNIC | ID | 13th Mar 2020 |
| 103.149.17.0/24 | 256 | APNIC |  CN | 4th Mar 2020 |
| 103.149.184.0/23 | 512 | APNIC | AU | 19th Mar 2020 |
| 103.149.2.0/23 | 512 | APNIC | IN | 1st Mar 2020 |
| 103.149.210.0/23 | 512 | APNIC | CN | 23rd Mar 2020 |
| 103.149.212.0/23 | 512 | APNIC | ID | 23rd Mar 2020 |
| 103.149.214.0/23 | 512 | APNIC | CN | 23rd Mar 2020 |
| 103.149.220.0/23 | 512 | APNIC | CN | 26th Mar 2020 |
| 103.149.226.0/24 | 256 | APNIC | ID | 26th Mar 2020 |
| 103.149.254.0/23 | 512 | APNIC | VN | 30th Mar 2020 |
| 103.149.44.0/23 | 512 | APNIC | CN | 6th Mar 2020 |
| 103.149.6.0/23 | 512 | APNIC | CN | 2nd Mar 2020 |
| 103.149.66.0/23 | 512 | APNIC | TW | 9th Mar 2020 |
| 103.149.70.0/24 | 256 | APNIC | IN | 9th Mar 2020 |
| 103.149.80.0/23 | 512 | APNIC | ID | 10th Mar 2020 |
| 103.149.82.0/24 | 256 | APNIC |  HK | 10th Mar 2020 |
| 103.15.124.0/24 | 256 | APNIC | IN | 27th Aug 2012 |
| 103.15.125.0/24 | 256 | APNIC |  US | 28th Aug 2012 |
| 103.15.128.0/22 | 1k | APNIC | AU | 27th Aug 2012 |
| 103.15.143.0/24 | 256 | APNIC | ID | 28th Aug 2012 |
| 103.15.158.0/24 | 256 | APNIC | US | 28th Aug 2012 |
| 103.15.16.0/22 | 1k | APNIC | CN | 14th Aug 2012 |
| 103.15.160.0/23 | 512 | APNIC | ID | 29th Sept 2022 |
| 103.15.176.0/24 | 256 | APNIC | IN | 29th Aug 2012 |
| 103.15.178.0/24 | 256 | APNIC | AU | 3rd Sept 2012 |
| 103.15.200.0/22 | 1k | APNIC | CN | 31st Aug 2012 |
| 103.15.68.0/22 | 1k | APNIC |  JP | 20th Aug 2012 |
| 103.15.72.0/23 | 512 | APNIC | AU | 20th Aug 2012 |
| 103.15.76.0/22 | 1k | APNIC | JP | 21st Aug 2012 |
| 103.15.8.0/22 | 1k | APNIC | CN | 14th Aug 2012 |
| 103.15.96.0/22 | 1k | APNIC | CN | 23rd Aug 2012 |
| 103.150.0.0/23 | 512 | APNIC | VN | 30th Mar 2020 |
| 103.150.10.0/23 | 512 | APNIC | CN | 14th Jun 2023 |
| 103.150.122.0/23 | 512 | APNIC | CN | 15th Apr 2020 |
| 103.150.126.0/23 | 512 | APNIC | CN | 15th Apr 2020 |
| 103.150.128.0/23 | 512 | APNIC | CN | 15th Apr 2020 |
| 103.150.130.0/23 | 512 | APNIC | CN | 15th Apr 2020 |
| 103.150.137.0/24 | 256 | APNIC | ID | 17th Apr 2020 |
| 103.150.146.0/23 | 512 | APNIC | CN | 17th Apr 2020 |
| 103.150.148.0/23 | 512 | APNIC | ID | 17th Apr 2020 |
| 103.150.158.0/24 | 256 | APNIC | ID | 20th Apr 2020 |
| 103.150.162.0/23 | 512 | APNIC |  KR | 20th Apr 2020 |
| 103.150.172.0/23 | 512 | APNIC | CN | 21st Apr 2020 |
| 103.150.182.0/23 | 512 | APNIC | ID | 21st Apr 2020 |
| 103.150.199.0/24 | 256 | APNIC | HK | 23rd Apr 2020 |