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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.87.40.0/22 | 1k | ARIN |  US | 13th Dec 1993 |
| 199.87.48.0/22 | 1k | ARIN |  CA | 23rd Jan 2012 |
| 199.88.0.0/20 | 4.1k | ARIN | US | 13th Dec 1993 |
| 199.88.128.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.129.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.130.0/24 | 256 | ARIN | US | 20th Nov 2015 |
| 199.88.132.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.133.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.136.0/23 | 512 | ARIN | US | 7th Aug 2012 |
| 199.88.138.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.140.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.142.0/23 | 512 | ARIN | US | 10th Feb 1994 |
| 199.88.144.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.145.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.146.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.147.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.148.0/23 | 512 | ARIN | US | 10th Feb 1994 |
| 199.88.150.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.151.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.152.0/23 | 512 | ARIN | US | 10th Feb 1994 |
| 199.88.154.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.155.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.156.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.157.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.159.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.160.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.161.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.162.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.163.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.164.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.168.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.169.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 199.88.170.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 199.88.172.0/22 | 1k | ARIN | US | 15th Feb 1994 |
| 199.88.176.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 199.88.177.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 199.88.178.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.180.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.181.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.182.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.183.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.185.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.186.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.188.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.189.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.190.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.192.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.193.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.195.0/24 | 256 | ARIN | US | 16th Feb 1994 |
| 199.88.196.0/24 | 256 | ARIN | US | 16th Feb 1994 |