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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.184.139.0/24 | 256 | ARIN |  US | 9th Dec 1993 |
| 198.184.14.0/24 | 256 | ARIN | US | 4th Jun 2018 |
| 198.184.141.0/24 | 256 | ARIN | US | 10th Dec 1993 |
| 198.184.142.0/24 | 256 | ARIN | US | 10th Dec 1993 |
| 198.184.143.0/24 | 256 | ARIN | US | 10th Dec 1993 |
| 198.184.144.0/24 | 256 | ARIN | US | 10th Dec 1993 |
| 198.184.146.0/24 | 256 | ARIN | US | 13th Dec 1993 |
| 198.184.148.0/24 | 256 | ARIN | US | 13th Dec 1993 |
| 198.184.149.0/24 | 256 | ARIN | US | 13th Dec 1993 |
| 198.184.159.0/24 | 256 | ARIN | US | 14th Dec 1993 |
| 198.184.16.0/21 | 2k | ARIN | US | 18th Jun 1993 |
| 198.184.160.0/24 | 256 | ARIN | US | 17th Dec 1993 |
| 198.184.162.0/24 | 256 | ARIN | US | 17th Dec 1993 |
| 198.184.163.0/24 | 256 | ARIN | US | 17th Dec 1993 |
| 198.184.164.0/24 | 256 | ARIN | US | 17th Dec 1993 |
| 198.184.165.0/24 | 256 | ARIN | US | 17th Dec 1993 |
| 198.184.166.0/23 | 512 | ARIN | US | 17th Dec 1993 |
| 198.184.168.0/24 | 256 | ARIN | US | 17th Dec 1993 |
| 198.184.169.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.171.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.172.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.173.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.174.0/23 | 512 | ARIN | US | 18th Dec 1993 |
| 198.184.176.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.177.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.178.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.179.0/24 | 256 | ARIN | US | 18th Dec 1993 |
| 198.184.184.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.185.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.186.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.187.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.193.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.194.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.195.0/24 | 256 | ARIN | US | 20th Dec 1993 |
| 198.184.196.0/24 | 256 | ARIN | US | 21st Dec 1993 |
| 198.184.198.0/24 | 256 | ARIN | US | 21st Dec 1993 |
| 198.184.199.0/24 | 256 | ARIN | US | 21st Dec 1993 |
| 198.184.200.0/24 | 256 | ARIN | US | 21st Dec 1993 |
| 198.184.201.0/24 | 256 | ARIN | US | 21st Dec 1993 |
| 198.184.202.0/23 | 512 | ARIN | US | 21st Dec 1993 |
| 198.184.204.0/23 | 512 | ARIN | US | 21st Dec 1993 |
| 198.184.206.0/24 | 256 | ARIN | US | 23rd Dec 1993 |
| 198.184.207.0/24 | 256 | ARIN | US | 23rd Dec 1993 |
| 198.184.210.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 198.184.211.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 198.184.212.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 198.184.213.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.214.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.215.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.216.0/24 | 256 | ARIN | US | 29th Dec 1993 |