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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.204.73.0/24 | 256 | ARIN |  US | 17th May 1994 |
| 198.204.79.0/24 | 256 | ARIN | US | 17th May 1994 |
| 198.204.81.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.83.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.84.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.85.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.86.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.87.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.93.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.94.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.95.0/24 | 256 | ARIN | US | 18th May 1994 |
| 198.204.97.0/24 | 256 | ARIN | US | 19th May 1994 |
| 198.204.98.0/24 | 256 | ARIN | US | 19th May 1994 |
| 198.205.0.0/22 | 1k | ARIN | US | 23rd Jun 1993 |
| 198.205.128.0/17 | 32.8k | ARIN | US | 18th Apr 1994 |
| 198.205.14.0/24 | 256 | RIPE NCC |  GB | 25th Jun 1993 |
| 198.205.32.0/19 | 8.2k | ARIN | US | 30th Jul 1993 |
| 198.205.4.0/24 | 256 | ARIN | US | 23rd Jun 1993 |
| 198.205.64.0/19 | 8.2k | ARIN | US | 12th Aug 1993 |
| 198.205.96.0/22 | 1k | ARIN | US | 12th Aug 1993 |
| 198.206.0.0/21 | 2k | ARIN | US | 29th Jun 1993 |
| 198.206.128.0/24 | 256 | ARIN | US | 21st Oct 1993 |
| 198.206.129.0/24 | 256 | ARIN | US | 21st Oct 1993 |
| 198.206.130.0/23 | 512 | ARIN | US | 23rd Sept 2022 |
| 198.206.136.0/24 | 256 | ARIN | US | 21st Oct 1993 |
| 198.206.137.0/24 | 256 | ARIN | US | 21st Oct 1993 |
| 198.206.138.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 198.206.139.0/24 | 256 | RIPE NCC |  ES | 22nd Oct 1993 |
| 198.206.140.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 198.206.141.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 198.206.142.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 198.206.143.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 198.206.144.0/22 | 1k | ARIN | US | 22nd Oct 1993 |
| 198.206.151.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 198.206.161.0/24 | 256 | ARIN | US | 25th Oct 1993 |
| 198.206.163.0/24 | 256 | ARIN | US | 25th Oct 1993 |
| 198.206.165.0/24 | 256 | ARIN | US | 25th Oct 1993 |
| 198.206.166.0/24 | 256 | ARIN | US | 25th Oct 1993 |
| 198.206.167.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.168.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.169.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.170.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.171.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.172.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.173.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.174.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.175.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.176.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.177.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.206.178.0/24 | 256 | ARIN | US | 27th Oct 1993 |