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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,461 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.78.45.0/24 | 256 | ARIN |  US | 3rd Oct 1989 |
| 192.78.48.0/20 | 4.1k | ARIN |  CA | 3rd Oct 1989 |
| 192.78.5.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.78.6.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.64.0/21 | 2k | ARIN | US | 3rd Oct 1989 |
| 192.78.76.0/22 | 1k | ARIN | US | 3rd Oct 1989 |
| 192.78.80.0/20 | 4.1k | ARIN | US | 3rd Oct 1989 |
| 192.78.96.0/23 | 512 | ARIN | US | 3rd Oct 1989 |
| 192.78.98.0/24 | 256 | ARIN | US | 3rd Oct 1989 |
| 192.79.0.0/16 | 65.5k | ARIN | US | 26th Mar 1990 |
| 192.8.177.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.8.183.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.80.11.0/24 | 256 | ARIN | US | 24th Apr 1990 |
| 192.80.18.0/24 | 256 | ARIN | US | 26th Apr 1990 |
| 192.80.19.0/24 | 256 | ARIN | US | 26th Apr 1990 |
| 192.80.206.0/24 | 256 | ARIN | US | 6th Feb 2015 |
| 192.80.207.0/24 | 256 | ARIN | US | 23rd May 1990 |
| 192.80.208.0/24 | 256 | ARIN | US | 23rd May 1990 |
| 192.80.212.0/24 | 256 | ARIN | US | 31st May 1990 |
| 192.80.213.0/24 | 256 | ARIN | US | 31st May 1990 |
| 192.80.215.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.80.216.0/21 | 2k | ARIN | US | 11th Jun 1990 |
| 192.80.22.0/24 | 256 | ARIN | US | 26th Apr 1990 |
| 192.80.23.0/24 | 256 | ARIN | US | 27th Apr 1990 |
| 192.80.25.0/24 | 256 | ARIN | US | 29th Dec 2014 |
| 192.80.252.0/23 | 512 | ARIN | US | 11th Jun 1990 |
| 192.80.254.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.80.30.0/24 | 256 | ARIN | US | 2nd May 1990 |
| 192.80.44.0/24 | 256 | ARIN | US | 25th Nov 1995 |
| 192.80.45.0/24 | 256 | ARIN | US | 19th Dec 2014 |
| 192.80.47.0/24 | 256 | ARIN | US | 7th May 1990 |
| 192.80.49.0/24 | 256 | ARIN | US | 7th May 1990 |
| 192.80.50.0/24 | 256 | ARIN | US | 8th May 1990 |
| 192.80.57.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.58.0/23 | 512 | ARIN | US | 12th Mar 2025 |
| 192.80.62.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.80.66.0/24 | 256 | ARIN | US | 5th Apr 1991 |
| 192.80.69.0/24 | 256 | ARIN | US | 16th Apr 1991 |
| 192.80.72.0/24 | 256 | ARIN | US | 3rd May 1991 |
| 192.80.76.0/24 | 256 | ARIN | US | 18th Dec 2014 |
| 192.80.77.0/24 | 256 | ARIN | US | 19th Jun 1991 |
| 192.80.78.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.79.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.81.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.82.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.85.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.86.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.80.87.0/24 | 256 | ARIN | US | 21st May 1990 |
| 192.81.115.0/24 | 256 | ARIN | US | 5th Jan 2015 |
| 192.81.120.0/24 | 256 | ARIN | US | 14th Jan 2015 |