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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 223.165.0.0/23 | 512 | APNIC |  TW | 25th Sept 2025 |
| 223.196.200.0/21 | 2k | APNIC |  IN | 30th Jul 2010 |
| 223.196.208.0/20 | 4.1k | APNIC | IN | 30th Jul 2010 |
| 223.196.224.0/19 | 8.2k | APNIC | IN | 30th Jul 2010 |
| 223.20.0.0/15 | 131k | APNIC |  CN | 6th Aug 2010 |
| 223.201.0.0/16 | 65.5k | APNIC | CN | 21st Jul 2010 |
| 223.25.192.0/19 | 8.2k | APNIC |  TH | 16th Aug 2010 |
| 223.25.228.0/22 | 1k | APNIC |  AU | 16th Aug 2010 |
| 223.25.48.0/21 | 2k | APNIC |  PH | 10th Aug 2010 |
| 223.255.0.0/17 | 32.8k | APNIC | CN | 10th Aug 2010 |
| 223.255.208.0/20 | 4.1k | APNIC |  KR | 2nd Aug 2010 |
| 223.255.255.0/24 | 256 | APNIC | AU | 11th Aug 2011 |
| 223.26.32.0/20 | 4.1k | APNIC | IN | 19th Aug 2010 |
| 223.26.6.0/23 | 512 | APNIC | TW | 17th Aug 2010 |
| 223.27.124.0/22 | 1k | APNIC |  JP | 30th Aug 2010 |
| 223.27.178.0/23 | 512 | APNIC | AU | 1st Sept 2010 |
| 223.27.188.0/22 | 1k | APNIC |  MY | 7th Sept 2010 |
| 223.29.208.0/22 | 1k | APNIC | CN | 1st Dec 2015 |
| 223.29.224.0/24 | 256 | APNIC |  PK | 3rd Sept 2010 |
| 223.29.228.0/23 | 512 | APNIC | PK | 3rd Sept 2010 |
| 223.29.235.0/24 | 256 | APNIC | PK | 3rd Sept 2010 |
| 23.111.8.0/22 | 1k | ARIN |  US | 24th Jul 2013 |
| 23.128.172.0/24 | 256 | ARIN | US | 6th Nov 2024 |
| 23.128.192.0/24 | 256 | ARIN | US | 14th Jul 2017 |
| 23.128.196.0/24 | 256 | ARIN | US | 7th Nov 2024 |
| 23.128.212.0/24 | 256 | ARIN |  BS | 7th Nov 2024 |
| 23.128.52.0/24 | 256 | ARIN | US | 22nd Oct 2024 |
| 23.128.82.0/24 | 256 | ARIN |  CA | 10th Nov 2021 |
| 23.128.84.0/24 | 256 | ARIN | US | 28th Oct 2024 |
| 23.128.88.0/24 | 256 | ARIN | US | 10th Nov 2021 |
| 23.128.98.0/24 | 256 | ARIN | US | 23rd Nov 2022 |
| 23.129.128.0/24 | 256 | ARIN | US | 21st Dec 2016 |
| 23.129.132.0/24 | 256 | ARIN | US | 18th Nov 2024 |
| 23.129.48.0/24 | 256 | ARIN | US | 21st Mar 2019 |
| 23.129.49.0/24 | 256 | ARIN | US | 25th Jun 2021 |
| 23.129.82.0/24 | 256 | ARIN | US | 9th Dec 2021 |
| 23.130.100.0/24 | 256 | ARIN | US | 5th Dec 2024 |
| 23.130.106.0/24 | 256 | ARIN | US | 14th Jan 2022 |
| 23.130.107.0/24 | 256 | ARIN | US | 14th Jan 2022 |
| 23.130.132.0/24 | 256 | ARIN | US | 6th Dec 2024 |
| 23.130.168.0/24 | 256 | ARIN |  GD | 20th Jan 2022 |
| 23.130.224.0/24 | 256 | ARIN |  VG | 16th May 2018 |
| 23.130.244.0/24 | 256 | ARIN | US | 16th Dec 2024 |
| 23.131.0.0/24 | 256 | ARIN | US | 17th May 2016 |
| 23.131.140.0/24 | 256 | ARIN | US | 31st Dec 2024 |
| 23.131.240.0/24 | 256 | ARIN | US | 19th Apr 2019 |
| 23.131.48.0/24 | 256 | ARIN | US | 8th Apr 2019 |
| 23.131.80.0/24 | 256 | ARIN | US | 10th Apr 2019 |
| 23.132.128.0/24 | 256 | ARIN | US | 9th Jan 2017 |
| 23.132.136.0/24 | 256 | ARIN | US | 25th Feb 2022 |