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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,149 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.224.0.0/16 | 65.5k | ARIN |  US | 15th Sept 1992 |
| 192.225.100.0/22 | 1k | ARIN | US | 30th Aug 2019 |
| 192.225.108.0/24 | 256 | ARIN | US | 22nd Nov 2019 |
| 192.225.109.0/24 | 256 | ARIN | US | 6th Apr 2026 |
| 192.225.24.0/23 | 512 | ARIN | US | 15th Sept 1992 |
| 192.225.28.0/22 | 1k | ARIN | US | 11th Feb 2013 |
| 192.225.32.0/20 | 4.1k | ARIN | US | 16th Sept 1992 |
| 192.225.48.0/21 | 2k | ARIN | US | 16th Sept 1992 |
| 192.225.56.0/24 | 256 | ARIN | US | 16th Sept 1992 |
| 192.225.59.0/24 | 256 | ARIN | US | 30th Apr 2015 |
| 192.225.97.0/24 | 256 | ARIN | US | 9th Sept 2019 |
| 192.226.0.0/21 | 2k | ARIN | US | 15th Mar 2013 |
| 192.226.16.0/20 | 4.1k | ARIN | US | 17th Sept 1992 |
| 192.226.8.0/21 | 2k | ARIN | US | 17th Sept 1992 |
| 192.227.1.0/24 | 256 | APNIC |  PH | 30th Sept 1992 |
| 192.227.2.0/23 | 512 | APNIC | PH | 30th Sept 1992 |
| 192.227.4.0/22 | 1k | APNIC | PH | 30th Sept 1992 |
| 192.227.8.0/21 | 2k | APNIC | PH | 30th Sept 1992 |
| 192.228.21.0/24 | 256 | ARIN |  CA | 22nd Jan 2003 |
| 192.228.4.0/22 | 1k | ARIN | CA | 17th Sept 1992 |
| 192.228.72.0/22 | 1k | ARIN | US | 8th Oct 1992 |
| 192.228.76.0/23 | 512 | ARIN | US | 8th Oct 1992 |
| 192.228.78.0/24 | 256 | ARIN | US | 8th Oct 1992 |
| 192.228.8.0/21 | 2k | ARIN | CA | 17th Sept 1992 |
| 192.228.88.0/22 | 1k | ARIN | US | 14th Jul 2003 |
| 192.228.93.0/24 | 256 | ARIN | US | 4th Jan 2016 |
| 192.229.128.0/17 | 32.8k | ARIN | US | 7th Feb 2013 |
| 192.229.32.0/19 | 8.2k | ARIN | US | 28th Sept 1992 |
| 192.230.16.0/20 | 4.1k | APNIC |  NZ | 7th Feb 2011 |
| 192.230.224.0/22 | 1k | ARIN | US | 9th May 2013 |
| 192.230.228.0/23 | 512 | ARIN | US | 9th May 2013 |
| 192.230.231.0/24 | 256 | ARIN | US | 9th May 2013 |
| 192.230.232.0/21 | 2k | ARIN | US | 9th May 2013 |
| 192.230.32.0/19 | 8.2k | ARIN | US | 22nd Feb 2013 |
| 192.231.0.0/24 | 256 | ARIN | US | 28th Jul 2015 |
| 192.231.1.0/24 | 256 | ARIN | US | 21st Sept 1992 |
| 192.231.100.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.101.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.102.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.103.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.104.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.105.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.107.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.108.0/24 | 256 | ARIN | US | 2nd Oct 1992 |
| 192.231.11.0/24 | 256 | ARIN | US | 22nd Sept 1992 |
| 192.231.111.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.231.12.0/24 | 256 | ARIN | US | 22nd Sept 1992 |
| 192.231.126.0/24 | 256 | ARIN | US | 6th Oct 1992 |
| 192.231.127.0/24 | 256 | APNIC |  AU | 6th Oct 1992 |
| 192.231.129.0/24 | 256 | ARIN | US | 7th Oct 1992 |