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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.94.245.0/24 | 256 | ARIN |  US | 6th Mar 1991 |
| 192.94.247.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.248.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.26.0/24 | 256 | ARIN | US | 8th Feb 1991 |
| 192.94.27.0/24 | 256 | ARIN | US | 8th Feb 1991 |
| 192.94.3.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.4.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.40.0/24 | 256 | ARIN |  CA | 12th Feb 1991 |
| 192.94.42.0/24 | 256 | ARIN | US | 13th Feb 1991 |
| 192.94.43.0/24 | 256 | ARIN | US | 13th Feb 1991 |
| 192.94.44.0/24 | 256 | ARIN | US | 13th Feb 1991 |
| 192.94.48.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.49.0/24 | 256 | ARIN | CA | 6th Feb 2015 |
| 192.94.5.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.50.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.51.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.52.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.53.0/24 | 256 | ARIN | US | 14th Feb 1991 |
| 192.94.54.0/24 | 256 | ARIN | CA | 15th Feb 1991 |
| 192.94.55.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.56.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.59.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.6.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.60.0/24 | 256 | ARIN | US | 15th Feb 1991 |
| 192.94.65.0/24 | 256 | ARIN | US | 21st Feb 1991 |
| 192.94.69.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.7.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.75.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.77.0/24 | 256 | ARIN | US | 18th Nov 2019 |
| 192.94.79.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.8.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.80.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.81.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.82.0/23 | 512 | ARIN | US | 22nd Feb 1991 |
| 192.94.84.0/22 | 1k | ARIN | US | 22nd Feb 1991 |
| 192.94.88.0/22 | 1k | ARIN | US | 22nd Feb 1991 |
| 192.94.9.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.94.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.95.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.96.0/22 | 1k | ARIN | US | 22nd Feb 1991 |
| 192.96.135.0/24 | 256 | ARIN | US | 6th Oct 2025 |
| 192.96.160.0/22 | 1k | ARIN | US | 11th Jan 2013 |
| 192.96.23.0/24 | 256 | ARIN | US | 12th Feb 2015 |
| 192.96.36.0/24 | 256 | ARIN | US | 17th Feb 2015 |
| 192.96.59.0/24 | 256 | ARIN | US | 18th Feb 2015 |
| 192.96.78.0/24 | 256 | ARIN | CA | 18th Feb 2015 |
| 192.97.0.0/16 | 65.5k | ARIN | US | 5th Mar 1991 |
| 193.187.1.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 193.30.88.0/24 | 256 | ARIN | US | 19th Apr 2022 |
| 194.164.105.0/24 | 256 | ARIN | US | 29th Jan 2024 |