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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.219.106.0/24 | 256 | ARIN |  CA | 23rd Mar 1993 |
| 192.219.107.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.108.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.109.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.110.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.111.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.112.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.113.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.114.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.115.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.116.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.117.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.118.0/24 | 256 | ARIN | CA | 23rd Mar 1993 |
| 192.219.17.0/24 | 256 | ARIN | CA | 4th Mar 1993 |
| 192.219.18.0/23 | 512 | ARIN | CA | 4th Mar 1993 |
| 192.219.20.0/22 | 1k | ARIN | CA | 4th Mar 1993 |
| 192.219.24.0/22 | 1k | ARIN | CA | 4th Mar 1993 |
| 192.219.242.0/24 | 256 | ARIN | CA | 2nd Apr 1993 |
| 192.219.243.0/24 | 256 | ARIN | CA | 2nd Apr 1993 |
| 192.219.244.0/24 | 256 | ARIN | CA | 2nd Apr 1993 |
| 192.219.245.0/24 | 256 | ARIN | CA | 2nd Apr 1993 |
| 192.219.246.0/24 | 256 | ARIN | CA | 2nd Apr 1993 |
| 192.219.247.0/24 | 256 | ARIN | CA | 1st Apr 1993 |
| 192.219.248.0/24 | 256 | ARIN | CA | 1st Apr 1993 |
| 192.219.251.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 192.219.252.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 192.219.28.0/24 | 256 | ARIN | CA | 4th Mar 1993 |
| 192.219.30.0/24 | 256 | ARIN | CA | 22nd Mar 1993 |
| 192.219.76.0/22 | 1k | ARIN | CA | 16th Nov 1993 |
| 192.219.80.0/21 | 2k | ARIN | CA | 16th Nov 1993 |
| 192.219.90.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.91.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.92.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.93.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.94.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.95.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.96.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.97.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.219.98.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.222.1.0/24 | 256 | ARIN | CA | 11th Sept 1992 |
| 192.222.101.0/24 | 256 | ARIN |  US | 3rd Aug 2015 |
| 192.222.112.0/20 | 4.1k | ARIN | US | 1st Oct 2012 |
| 192.222.2.0/23 | 512 | ARIN | CA | 11th Sept 1992 |
| 192.222.4.0/22 | 1k | ARIN | CA | 11th Sept 1992 |
| 192.222.8.0/24 | 256 | ARIN | CA | 11th Sept 1992 |
| 192.223.0.0/24 | 256 | ARIN | US | 30th Jul 2015 |
| 192.223.1.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.223.16.0/21 | 2k | ARIN | US | 11th Sept 1992 |
| 192.223.2.0/23 | 512 | ARIN | US | 11th Sept 1992 |
| 192.223.8.0/24 | 256 | ARIN | US | 11th Sept 1992 |