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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.34.212.0/24 | 256 | ARIN |  US | 11th Jan 1994 |
| 192.34.214.0/24 | 256 | ARIN | US | 28th Jan 2000 |
| 192.34.216.0/21 | 2k | ARIN |  CA | 30th Nov 2012 |
| 192.34.240.0/22 | 1k | ARIN | US | 28th Aug 2012 |
| 192.34.244.0/24 | 256 | ARIN | US | 30th Jan 1997 |
| 192.34.245.0/24 | 256 | ARIN | US | 26th Jun 2024 |
| 192.34.247.0/24 | 256 | ARIN | US | 21st Oct 1988 |
| 192.34.25.0/24 | 256 | ARIN | US | 10th Jun 2000 |
| 192.34.32.0/23 | 512 | ARIN | US | 15th Jul 2014 |
| 192.34.35.0/24 | 256 | ARIN | US | 19th Oct 1988 |
| 192.34.50.0/24 | 256 | RIPE NCC |  GB | 9th Apr 1992 |
| 192.34.71.0/24 | 256 | ARIN | US | 10th Jun 2000 |
| 192.34.72.0/24 | 256 | ARIN | US | 10th Jun 2000 |
| 192.34.76.0/22 | 1k | ARIN | US | 19th Oct 2022 |
| 192.34.88.0/24 | 256 | ARIN | US | 28th Jul 2014 |
| 192.34.89.0/24 | 256 | ARIN | US | 28th Jul 2014 |
| 192.34.90.0/24 | 256 | ARIN | US | 4th Jul 1990 |
| 192.34.91.0/24 | 256 | ARIN | US | 11th Jun 2014 |
| 192.34.96.0/22 | 1k | ARIN | US | 13th Sept 2019 |
| 192.35.100.0/24 | 256 | ARIN | US | 28th Mar 1988 |
| 192.35.101.0/24 | 256 | ARIN | US | 28th Mar 1988 |
| 192.35.102.0/24 | 256 | ARIN | US | 29th Mar 1988 |
| 192.35.105.0/24 | 256 | ARIN | US | 31st Mar 1988 |
| 192.35.106.0/24 | 256 | ARIN | US | 31st Mar 1988 |
| 192.35.107.0/24 | 256 | ARIN | US | 31st Mar 1988 |
| 192.35.108.0/24 | 256 | RIPE NCC | GB | 1st Apr 1988 |
| 192.35.120.0/22 | 1k | ARIN | US | 5th Apr 1988 |
| 192.35.124.0/23 | 512 | ARIN | US | 5th Apr 1988 |
| 192.35.126.0/24 | 256 | ARIN | US | 5th Apr 1988 |
| 192.35.127.0/24 | 256 | ARIN | US | 3rd Jun 2014 |
| 192.35.130.0/24 | 256 | RIPE NCC |  NL | 15th Apr 1993 |
| 192.35.131.0/24 | 256 | RIPE NCC | NL | 7th Apr 1988 |
| 192.35.132.0/24 | 256 | RIPE NCC | NL | 15th Apr 1993 |
| 192.35.134.0/24 | 256 | ARIN | US | 7th Apr 1988 |
| 192.35.135.0/24 | 256 | ARIN | US | 7th Apr 1988 |
| 192.35.136.0/24 | 256 | ARIN | US | 7th Apr 1988 |
| 192.35.137.0/24 | 256 | ARIN | US | 7th Apr 1988 |
| 192.35.138.0/24 | 256 | RIPE NCC | GB | 7th Apr 1988 |
| 192.35.140.0/24 | 256 | ARIN | US | 11th Jun 2014 |
| 192.35.141.0/24 | 256 | ARIN | US | 11th Apr 1988 |
| 192.35.143.0/24 | 256 | ARIN | US | 13th Jun 1988 |
| 192.35.144.0/24 | 256 | ARIN | CA | 14th Apr 1988 |
| 192.35.146.0/24 | 256 | RIPE NCC |  IT | 15th Apr 1988 |
| 192.35.155.0/24 | 256 | ARIN | US | 21st Apr 1988 |
| 192.35.16.0/22 | 1k | RIPE NCC |  DE | 28th Oct 1987 |
| 192.35.161.0/24 | 256 | ARIN | US | 28th Apr 1988 |
| 192.35.162.0/23 | 512 | ARIN | US | 28th Apr 1988 |
| 192.35.164.0/22 | 1k | ARIN | US | 28th Apr 1988 |
| 192.35.168.0/23 | 512 | ARIN | US | 28th Apr 1988 |
| 192.35.171.0/24 | 256 | ARIN | US | 20th May 1988 |