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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.246.242.0/24 | 256 | ARIN |  US | 5th Aug 1994 |
| 198.246.246.0/24 | 256 | ARIN | US | 9th Aug 1994 |
| 198.246.247.0/24 | 256 | ARIN | US | 9th Aug 1994 |
| 198.246.40.0/22 | 1k | ARIN | US | 24th Aug 1993 |
| 198.246.48.0/20 | 4.1k | ARIN | US | 17th Apr 2012 |
| 198.246.8.0/21 | 2k | ARIN | US | 24th Aug 1993 |
| 198.251.12.0/23 | 512 | ARIN | US | 3rd Sept 1993 |
| 198.251.14.0/24 | 256 | ARIN | US | 3rd Sept 1993 |
| 198.251.15.0/24 | 256 | ARIN | US | 10th Oct 2012 |
| 198.251.28.0/23 | 512 | ARIN | US | 30th Aug 1993 |
| 198.252.0.0/21 | 2k | ARIN | US | 31st Aug 1993 |
| 198.252.128.0/22 | 1k | ARIN |  CA | 22nd Nov 1993 |
| 198.252.132.0/23 | 512 | ARIN | US | 22nd Nov 1993 |
| 198.252.134.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.252.135.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.252.137.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.252.139.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.252.142.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.146.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.147.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.148.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.149.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.151.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.152.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.16.0/20 | 4.1k | ARIN | US | 1st Sept 1993 |
| 198.252.160.0/24 | 256 | ARIN | US | 16th Oct 2012 |
| 198.252.161.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.164.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.170.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.171.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.252.174.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.175.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.176.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.177.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.178.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.179.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.180.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.252.181.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.183.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.184.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.185.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.186.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.187.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.188.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.189.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.252.190.0/23 | 512 | ARIN | US | 26th Nov 1993 |
| 198.252.192.0/23 | 512 | ARIN | US | 26th Nov 1993 |
| 198.252.194.0/23 | 512 | ARIN | US | 29th Nov 1993 |
| 198.252.202.0/23 | 512 | ARIN | US | 12th Feb 2013 |
| 198.252.207.0/24 | 256 | ARIN | US | 30th Nov 1993 |