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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,476 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.253.212.0/23 | 512 | ARIN |  US | 22nd Feb 1995 |
| 199.253.242.0/23 | 512 | ARIN | US | 2nd Mar 1995 |
| 199.253.248.0/24 | 256 | ARIN | US | 2nd Mar 1995 |
| 199.253.32.0/20 | 4.1k | ARIN | US | 5th May 1994 |
| 199.253.48.0/21 | 2k | ARIN | US | 5th May 1994 |
| 199.253.62.0/24 | 256 | ARIN | US | 9th Sept 2008 |
| 199.253.64.0/19 | 8.2k | ARIN | US | 16th Sept 1994 |
| 199.254.104.0/21 | 2k | ARIN |  BB | 17th Aug 2012 |
| 199.254.128.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.129.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.130.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.131.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.132.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.134.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.136.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.137.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.138.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.139.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.140.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.142.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 199.254.143.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.144.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.145.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.146.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.147.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.148.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.150.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.151.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.152.0/24 | 256 | ARIN |  CA | 14th Oct 1994 |
| 199.254.153.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.154.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.155.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.159.0/24 | 256 | ARIN | US | 14th Oct 1994 |
| 199.254.161.0/24 | 256 | ARIN | US | 19th Oct 1994 |
| 199.254.162.0/24 | 256 | ARIN | US | 19th Oct 1994 |
| 199.254.163.0/24 | 256 | ARIN | US | 19th Oct 1994 |
| 199.254.164.0/24 | 256 | ARIN | US | 19th Oct 1994 |
| 199.254.166.0/24 | 256 | ARIN | US | 20th Oct 1994 |
| 199.254.167.0/24 | 256 | ARIN | US | 20th Oct 1994 |
| 199.254.169.0/24 | 256 | ARIN | US | 20th Oct 1994 |
| 199.254.172.0/24 | 256 | ARIN | US | 21st Oct 1994 |
| 199.254.173.0/24 | 256 | ARIN | US | 21st Oct 1994 |
| 199.254.174.0/24 | 256 | ARIN | US | 21st Oct 1994 |
| 199.254.175.0/24 | 256 | ARIN | US | 21st Oct 1994 |
| 199.254.178.0/24 | 256 | ARIN | US | 21st Oct 1994 |
| 199.254.179.0/24 | 256 | ARIN | US | 24th Oct 1994 |
| 199.254.180.0/24 | 256 | ARIN | US | 24th Oct 1994 |
| 199.254.181.0/24 | 256 | ARIN | US | 24th Oct 1994 |
| 199.254.182.0/24 | 256 | ARIN | US | 24th Oct 1994 |
| 199.254.183.0/24 | 256 | ARIN | US | 24th Oct 1994 |