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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 205.207.119.0/24 | 256 | ARIN |  CA | 8th Sept 1995 |
| 205.207.130.0/24 | 256 | ARIN | CA | 8th Sept 1995 |
| 205.207.131.0/24 | 256 | ARIN | CA | 15th Sept 1995 |
| 205.207.132.0/24 | 256 | ARIN | CA | 15th Sept 1995 |
| 205.207.134.0/24 | 256 | ARIN | CA | 11th Sept 1995 |
| 205.207.135.0/24 | 256 | ARIN | CA | 11th Sept 1995 |
| 205.207.136.0/24 | 256 | ARIN | CA | 11th Sept 1995 |
| 205.207.137.0/24 | 256 | ARIN | CA | 11th Sept 1995 |
| 205.207.138.0/24 | 256 | ARIN | CA | 6th Aug 1996 |
| 205.207.139.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.140.0/24 | 256 | ARIN | CA | 8th Sept 1995 |
| 205.207.143.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.152.0/24 | 256 | ARIN | CA | 19th Sept 1995 |
| 205.207.153.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.154.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.156.0/22 | 1k | ARIN |  US | 2nd Dec 2008 |
| 205.207.16.0/21 | 2k | ARIN | CA | 1st Aug 1995 |
| 205.207.168.0/23 | 512 | ARIN | CA | 25th Sept 1995 |
| 205.207.170.0/23 | 512 | ARIN | US | 22nd Sept 1995 |
| 205.207.173.0/24 | 256 | ARIN | CA | 2nd Oct 1995 |
| 205.207.174.0/24 | 256 | ARIN | CA | 2nd Oct 1995 |
| 205.207.176.0/24 | 256 | ARIN | CA | 2nd Oct 1995 |
| 205.207.177.0/24 | 256 | ARIN | CA | 5th Oct 1995 |
| 205.207.182.0/24 | 256 | ARIN | CA | 21st Sept 1995 |
| 205.207.187.0/24 | 256 | ARIN | CA | 29th Aug 1995 |
| 205.207.188.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.2.0/23 | 512 | ARIN | CA | 1st Aug 1995 |
| 205.207.204.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.206.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.207.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.208.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.209.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.210.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.211.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.218.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.225.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.227.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.228.0/22 | 1k | ARIN | CA | 8th Apr 1995 |
| 205.207.233.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.234.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.235.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.238.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.239.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.24.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.240.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.241.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.242.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.243.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.244.0/24 | 256 | ARIN | CA | 8th Apr 1995 |
| 205.207.245.0/24 | 256 | ARIN | CA | 8th Apr 1995 |