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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,285 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.30.220.0/22 | 1k | ARIN |  US | 23rd Dec 2024 |
| 199.30.224.0/22 | 1k | ARIN | US | 16th Sept 2010 |
| 199.30.244.0/22 | 1k | ARIN | US | 11th Mar 2025 |
| 199.30.32.0/21 | 2k | ARIN | US | 25th Oct 1993 |
| 199.30.40.0/22 | 1k | ARIN | US | 25th Oct 1993 |
| 199.30.44.0/23 | 512 | ARIN | US | 25th Oct 1993 |
| 199.30.80.0/22 | 1k | ARIN | US | 13th Jan 2026 |
| 199.33.0.0/21 | 2k | ARIN | US | 22nd Oct 1993 |
| 199.33.116.0/23 | 512 | ARIN | US | 7th Jul 2015 |
| 199.33.118.0/24 | 256 | ARIN | US | 11th Apr 2022 |
| 199.33.136.0/24 | 256 | ARIN | US | 7th Jan 1994 |
| 199.33.137.0/24 | 256 | ARIN | US | 7th Jan 1994 |
| 199.33.138.0/24 | 256 | ARIN | US | 7th Jan 1994 |
| 199.33.139.0/24 | 256 | ARIN | US | 7th Jan 1994 |
| 199.33.140.0/24 | 256 | ARIN | US | 4th Aug 2016 |
| 199.33.142.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.143.0/24 | 256 | ARIN | US | 3rd Sept 2015 |
| 199.33.144.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.145.0/24 | 256 | ARIN | US | 22nd Jan 2016 |
| 199.33.146.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.147.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.149.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.150.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.151.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.152.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.153.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.154.0/23 | 512 | ARIN | US | 10th Jan 1994 |
| 199.33.156.0/23 | 512 | ARIN | US | 10th Jan 1994 |
| 199.33.158.0/24 | 256 | ARIN | US | 10th Jan 1994 |
| 199.33.159.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.16.0/21 | 2k | ARIN | US | 22nd Oct 1993 |
| 199.33.174.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.175.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.176.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.177.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.178.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.182.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.183.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.184.0/22 | 1k | ARIN | US | 11th Jan 1994 |
| 199.33.188.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 199.33.189.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.190.0/23 | 512 | ARIN | US | 12th Jan 1994 |
| 199.33.192.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.193.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.194.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.195.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.196.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.197.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.198.0/24 | 256 | ARIN | US | 12th Jan 1994 |
| 199.33.199.0/24 | 256 | ARIN | US | 12th Jan 1994 |