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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,034 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.233.175.0/24 | 256 | ARIN |  US | 4th May 1995 |
| 199.233.176.0/24 | 256 | ARIN | US | 5th May 1995 |
| 199.233.177.0/24 | 256 | ARIN | US | 5th May 1995 |
| 199.233.180.0/24 | 256 | ARIN | US | 5th May 1995 |
| 199.233.185.0/24 | 256 | ARIN | US | 5th May 1995 |
| 199.233.186.0/24 | 256 | ARIN | US | 5th May 1995 |
| 199.233.187.0/24 | 256 | ARIN | US | 15th May 1995 |
| 199.233.188.0/24 | 256 | ARIN | US | 15th May 1995 |
| 199.233.189.0/24 | 256 | ARIN | US | 24th May 1995 |
| 199.233.192.0/24 | 256 | ARIN | US | 11th Apr 2012 |
| 199.233.193.0/24 | 256 | ARIN | US | 2nd Jun 1995 |
| 199.233.194.0/24 | 256 | ARIN | US | 7th Jun 1995 |
| 199.233.195.0/24 | 256 | ARIN | US | 8th Jun 1995 |
| 199.233.196.0/23 | 512 | ARIN | US | 9th Jun 1995 |
| 199.233.198.0/23 | 512 | ARIN | US | 15th Jun 1995 |
| 199.233.200.0/24 | 256 | ARIN | US | 30th Jun 1995 |
| 199.233.201.0/24 | 256 | ARIN | US | 3rd Jul 1995 |
| 199.233.204.0/24 | 256 | ARIN | US | 11th Apr 2012 |
| 199.233.211.0/24 | 256 | ARIN | US | 14th Jul 1995 |
| 199.233.212.0/24 | 256 | ARIN | US | 20th Jul 1995 |
| 199.233.213.0/24 | 256 | ARIN | US | 27th Jul 1995 |
| 199.233.214.0/24 | 256 | ARIN | US | 31st Oct 1995 |
| 199.233.215.0/24 | 256 | ARIN | US | 31st Oct 1995 |
| 199.233.216.0/24 | 256 | ARIN | US | 21st Nov 1995 |
| 199.233.24.0/23 | 512 | ARIN | US | 13th Apr 1994 |
| 199.233.48.0/21 | 2k | ARIN | US | 11th Aug 2011 |
| 199.233.56.0/24 | 256 | ARIN | US | 11th Aug 2011 |
| 199.233.57.0/24 | 256 | ARIN | US | 13th Jul 2012 |
| 199.233.64.0/24 | 256 | ARIN | US | 31st Jan 1995 |
| 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 |