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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.203.230.0/24 | 256 | ARIN |  US | 10th May 1994 |
| 198.203.231.0/24 | 256 | ARIN | US | 10th May 1994 |
| 198.203.233.0/24 | 256 | ARIN | US | 11th May 1994 |
| 198.203.234.0/24 | 256 | ARIN | US | 11th May 1994 |
| 198.203.235.0/24 | 256 | ARIN |  CA | 11th May 1994 |
| 198.203.236.0/24 | 256 | ARIN | US | 11th May 1994 |
| 198.203.24.0/23 | 512 | ARIN | US | 22nd Jun 1993 |
| 198.203.246.0/23 | 512 | ARIN | US | 11th May 1994 |
| 198.203.248.0/23 | 512 | ARIN | US | 11th May 1994 |
| 198.203.26.0/23 | 512 | ARIN | US | 28th Jan 2013 |
| 198.203.28.0/23 | 512 | ARIN | US | 10th Oct 2012 |
| 198.203.4.0/22 | 1k | ARIN | US | 24th Feb 2020 |
| 198.203.40.0/22 | 1k | ARIN | US | 12th Aug 1993 |
| 198.203.8.0/21 | 2k | ARIN | US | 22nd Jun 1993 |
| 198.204.0.0/21 | 2k | ARIN | US | 22nd Jun 1993 |
| 198.204.106.0/24 | 256 | ARIN | US | 19th May 1994 |
| 198.204.107.0/24 | 256 | ARIN | US | 19th May 1994 |
| 198.204.108.0/24 | 256 | ARIN | US | 19th May 1994 |
| 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 |
| 198.204.71.0/24 | 256 | ARIN |  PR | 17th May 1994 |
| 198.204.72.0/24 | 256 | ARIN | PR | 17th 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 |
| 198.204.97.0/24 | 256 | ARIN | US | 19th May 1994 |
| 198.204.98.0/24 | 256 | ARIN | US | 19th May 1994 |