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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 199.233.65.0/24 | 256 | ARIN |  US | 31st Jan 1995 |
| 199.233.66.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.67.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.69.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.70.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.71.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.72.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.73.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 199.233.75.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 199.233.76.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 199.233.79.0/24 | 256 | ARIN | US | 10th Feb 1995 |
| 199.233.8.0/22 | 1k | ARIN | US | 18th Apr 1994 |
| 199.233.85.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.88.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.89.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.91.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.92.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.93.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.94.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.96.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.97.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.98.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.233.99.0/24 | 256 | ARIN | US | 27th Feb 1995 |
| 199.24.0.0/15 | 131k | ARIN |  CA | 14th Oct 1993 |
| 199.241.112.0/21 | 2k | ARIN | US | 26th Jul 2012 |
| 199.241.144.0/22 | 1k | ARIN | US | 27th Jul 2012 |
| 199.241.152.0/21 | 2k | ARIN | US | 27th Jul 2012 |
| 199.241.204.0/22 | 1k | ARIN | US | 16th Dec 2024 |
| 199.241.40.0/22 | 1k | ARIN | CA | 2nd Oct 2025 |
| 199.241.62.0/23 | 512 | ARIN | US | 8th Jul 2015 |
| 199.242.128.0/23 | 512 | ARIN | US | 5th May 1994 |
| 199.242.130.0/24 | 256 | ARIN | US | 5th May 1994 |
| 199.242.131.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.132.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.133.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.134.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.136.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.137.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.138.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.139.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.142.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.143.0/24 | 256 | ARIN | US | 9th May 1994 |
| 199.242.155.0/24 | 256 | ARIN | US | 10th May 1994 |
| 199.242.156.0/23 | 512 | ARIN | US | 10th May 1994 |
| 199.242.158.0/23 | 512 | ARIN | US | 10th May 1994 |
| 199.242.160.0/24 | 256 | ARIN | US | 10th May 1994 |
| 199.242.161.0/24 | 256 | ARIN | US | 10th May 1994 |
| 199.242.162.0/24 | 256 | ARIN | US | 11th May 1994 |
| 199.242.165.0/24 | 256 | ARIN | US | 11th May 1994 |
| 199.242.166.0/24 | 256 | ARIN | US | 11th May 1994 |