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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,034 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.204.109.0/24 | 256 | ARIN |  US | 20th May 1994 |
| 198.204.110.0/24 | 256 | ARIN | US | 20th May 1994 |
| 198.204.124.0/24 | 256 | ARIN | US | 24th May 1994 |
| 198.204.127.0/24 | 256 | ARIN | US | 26th May 1994 |
| 198.204.16.0/21 | 2k | ARIN | US | 25th Jun 1993 |
| 198.204.200.0/23 | 512 | ARIN | US | 13th Apr 1994 |
| 198.204.24.0/22 | 1k | ARIN | US | 25th Jun 1993 |
| 198.204.28.0/24 | 256 | ARIN | US | 25th Jun 1993 |
| 198.204.29.0/24 | 256 | ARIN | US | 14th Feb 2025 |
| 198.204.32.0/20 | 4.1k | ARIN | US | 6th Aug 1993 |
| 198.204.60.0/23 | 512 | ARIN | US | 6th Aug 1993 |
| 198.204.64.0/24 | 256 | ARIN | US | 12th May 1994 |
| 198.204.65.0/24 | 256 | ARIN | US | 12th May 1994 |
| 198.204.67.0/24 | 256 | ARIN | US | 16th May 1994 |
| 198.204.68.0/24 | 256 | ARIN | US | 16th May 1994 |
| 198.204.69.0/24 | 256 | ARIN | US | 16th May 1994 |
| 198.204.70.0/24 | 256 | ARIN | US | 16th May 1994 |
| 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 |
| 198.204.96.0/24 | 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 |
| 198.205.32.0/19 | 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 |
| 198.206.140.0/24 | 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 |