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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.80.44.0/24 | 256 | ARIN |  US | 25th Nov 1995 |
| 192.80.45.0/24 | 256 | ARIN | US | 19th Dec 2014 |
| 192.80.46.0/24 | 256 | RIPE NCC |  GB | 7th May 1990 |
| 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 |
| 192.80.51.0/24 | 256 | RIPE NCC |  DE | 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 |
| 192.81.109.0/24 | 256 | RIPE NCC |  NO | 13th Jan 1993 |
| 192.81.115.0/24 | 256 | ARIN | US | 5th Jan 2015 |
| 192.81.120.0/24 | 256 | ARIN | US | 14th Jan 2015 |
| 192.81.124.0/22 | 1k | ARIN | US | 2nd Jan 2013 |
| 192.81.160.0/24 | 256 | RIPE NCC |  FI | 1st Sept 1993 |
| 192.81.161.0/24 | 256 | ARIN | US | 2nd Jan 2015 |
| 192.81.166.0/24 | 256 | ARIN | US | 24th Oct 1994 |
| 192.81.176.0/22 | 1k | ARIN | US | 3rd Jan 2013 |
| 192.81.182.0/23 | 512 | RIPE NCC | FI | 1st Sept 1993 |
| 192.81.186.0/23 | 512 | ARIN | US | 17th Sept 2013 |
| 192.81.190.0/24 | 256 | ARIN | US | 30th May 1990 |
| 192.81.192.0/24 | 256 | ARIN | US | 7th Jul 1992 |
| 192.81.193.0/24 | 256 | RIPE NCC |  IT | 10th Mar 2017 |
| 192.81.194.0/24 | 256 | RIPE NCC |  SE | 29th Oct 1992 |
| 192.81.230.0/24 | 256 | RIPE NCC | DE | 1st Jan 1984 |
| 192.81.234.0/24 | 256 | RIPE NCC | GB | 1st Jan 1984 |
| 192.81.48.0/24 | 256 | ARIN | US | 30th May 1990 |
| 192.81.50.0/23 | 512 | ARIN | US | 10th Dec 2014 |
| 192.81.58.0/24 | 256 | ARIN | US | 7th Jan 2015 |
| 192.81.59.0/24 | 256 | RIPE NCC |  BE | 18th May 1994 |
| 192.81.60.0/24 | 256 | ARIN | US | 5th Jan 2015 |
| 192.81.61.0/24 | 256 | RIPE NCC | GB | 31st Aug 1995 |
| 192.81.62.0/24 | 256 | RIPE NCC | GB | 31st Aug 1995 |
| 192.81.67.0/24 | 256 | ARIN | US | 6th Jun 1991 |
| 192.81.74.0/24 | 256 | ARIN | US | 12th Apr 1995 |
| 192.81.8.0/24 | 256 | ARIN | US | 10th Jun 1992 |
| 192.81.88.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 192.81.89.0/24 | 256 | ARIN | US | 11th Apr 2022 |