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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.235.25.0/24 | 256 | ARIN |  CA | 30th Sept 1993 |
| 198.235.252.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.235.254.0/24 | 256 | ARIN | CA | 15th May 1994 |
| 198.235.26.0/24 | 256 | ARIN | CA | 30th Sept 1993 |
| 198.235.27.0/24 | 256 | ARIN |  US | 30th Sept 1993 |
| 198.235.28.0/23 | 512 | ARIN | CA | 30th Sept 1993 |
| 198.235.3.0/24 | 256 | ARIN | CA | 11th May 1994 |
| 198.235.30.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.235.31.0/24 | 256 | ARIN | CA | 30th Sept 1993 |
| 198.235.32.0/20 | 4.1k | ARIN | US | 17th May 1994 |
| 198.235.4.0/22 | 1k | ARIN | CA | 6th Aug 1993 |
| 198.235.48.0/23 | 512 | ARIN | CA | 23rd May 1994 |
| 198.235.50.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 198.235.51.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 198.235.52.0/23 | 512 | ARIN | CA | 23rd May 1994 |
| 198.235.56.0/24 | 256 | ARIN | CA | 1st Jun 1994 |
| 198.235.62.0/24 | 256 | ARIN | CA | 1st Jun 1994 |
| 198.235.8.0/24 | 256 | ARIN | CA | 12th Aug 1993 |
| 198.235.9.0/24 | 256 | ARIN | CA | 12th Aug 1993 |
| 198.240.0.0/21 | 2k | ARIN | US | 2nd Aug 1993 |
| 198.240.16.0/20 | 4.1k | ARIN | US | 31st Aug 1993 |
| 198.240.32.0/19 | 8.2k | ARIN | US | 24th Nov 1993 |
| 198.240.64.0/18 | 16.4k | ARIN | US | 12th Nov 1993 |
| 198.240.8.0/21 | 2k | ARIN | US | 9th Aug 1993 |
| 198.241.10.0/23 | 512 | ARIN | US | 24th Oct 2012 |
| 198.241.32.0/21 | 2k | ARIN | US | 5th Aug 1993 |
| 198.241.40.0/22 | 1k | ARIN | US | 5th Aug 1993 |
| 198.241.48.0/24 | 256 | ARIN | US | 11th Apr 2012 |
| 198.241.50.0/23 | 512 | ARIN | US | 11th Apr 2012 |
| 198.241.52.0/22 | 1k | ARIN | US | 11th Apr 2012 |
| 198.241.56.0/22 | 1k | ARIN | US | 11th Apr 2012 |
| 198.241.63.0/24 | 256 | ARIN | US | 18th Apr 2023 |
| 198.241.64.0/18 | 16.4k | ARIN | US | 15th Jul 1994 |
| 198.244.10.0/23 | 512 | APNIC |  AU | 16th Oct 2012 |
| 198.244.32.0/21 | 2k | ARIN | US | 21st Sept 1993 |
| 198.244.40.0/22 | 1k | ARIN | US | 21st Sept 1993 |
| 198.244.44.0/23 | 512 | ARIN | US | 21st Sept 1993 |
| 198.244.46.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.245.12.0/24 | 256 | ARIN | US | 20th Aug 1993 |
| 198.245.137.0/24 | 256 | ARIN | US | 21st Jun 1994 |
| 198.245.138.0/24 | 256 | ARIN | US | 21st Jun 1994 |
| 198.245.139.0/24 | 256 | ARIN |  PR | 23rd Jun 1994 |
| 198.245.140.0/24 | 256 | ARIN | US | 23rd Jun 1994 |
| 198.245.141.0/24 | 256 | ARIN | US | 23rd Jun 1994 |
| 198.245.148.0/24 | 256 | ARIN | US | 24th Jun 1994 |
| 198.245.149.0/24 | 256 | ARIN | US | 24th Jun 1994 |
| 198.245.151.0/24 | 256 | ARIN | US | 24th Jun 1994 |
| 198.245.152.0/22 | 1k | ARIN | US | 24th Jun 1994 |
| 198.245.156.0/24 | 256 | ARIN | US | 24th Jun 1994 |
| 198.245.159.0/24 | 256 | ARIN | US | 24th Jun 1994 |