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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 140.235.120.0/24 | 256 | ARIN |  US | 3rd Oct 2024 |
| 140.235.126.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 140.235.127.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 140.235.152.0/22 | 1k | ARIN | US | 3rd Oct 2024 |
| 140.235.184.0/24 | 256 | ARIN |  CA | 3rd Oct 2024 |
| 140.235.185.0/24 | 256 | ARIN | US | 9th Oct 2024 |
| 140.235.186.0/23 | 512 | ARIN | US | 23rd Dec 2024 |
| 140.235.238.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 140.235.244.0/22 | 1k | ARIN | US | 3rd Oct 2024 |
| 140.235.48.0/22 | 1k | ARIN | US | 4th Oct 2024 |
| 140.235.56.0/22 | 1k | ARIN | US | 3rd Oct 2024 |
| 140.235.76.0/22 | 1k | ARIN | US | 3rd Oct 2024 |
| 140.235.84.0/22 | 1k | ARIN | US | 3rd Oct 2024 |
| 140.24.0.0/16 | 65.5k | ARIN | US | 8th Apr 1990 |
| 140.26.0.0/16 | 65.5k | ARIN | US | 8th Apr 1990 |
| 140.4.0.0/16 | 65.5k | ARIN | US | 8th Apr 1990 |
| 140.76.0.0/16 | 65.5k | ARIN | US | 9th Apr 1990 |
| 140.81.0.0/16 | 65.5k | APNIC |  JP | 23rd Feb 2011 |
| 140.82.64.0/19 | 8.2k | ARIN | US | 30th May 2018 |
| 140.82.96.0/20 | 4.1k | ARIN | US | 30th May 2018 |
| 140.87.0.0/16 | 65.5k | ARIN | US | 9th Apr 1990 |
| 140.88.0.0/16 | 65.5k | ARIN | US | 9th Apr 1990 |
| 141.102.0.0/16 | 65.5k | ARIN | US | 6th Jul 1990 |
| 141.105.0.0/20 | 4.1k | RIPE NCC |  NL | 24th Jun 2011 |
| 141.105.176.0/20 | 4.1k | RIPE NCC |  GB | 28th Jun 2011 |
| 141.109.128.0/19 | 8.2k | ARIN | CA | 12th Jul 1990 |
| 141.120.0.0/16 | 65.5k | APNIC |  AU | 24th Jul 1990 |
| 141.121.0.0/16 | 65.5k | ARIN | US | 20th Oct 1990 |
| 141.128.0.0/16 | 65.5k | ARIN | US | 20th Oct 1990 |
| 141.133.128.0/24 | 256 | RIPE NCC |  RU | 27th Oct 1992 |
| 141.133.129.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.130.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.131.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.134.0/23 | 512 | RIPE NCC |  KG | 27th Oct 1992 |
| 141.133.142.0/23 | 512 | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.144.0/20 | 4.1k | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.160.0/21 | 2k | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.168.0/22 | 1k | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.192.0/19 | 8.2k | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.224.0/19 | 8.2k | RIPE NCC | RU | 27th Oct 1992 |
| 141.159.0.0/16 | 65.5k | ARIN | US | 24th Apr 1990 |
| 141.16.0.0/16 | 65.5k | RIPE NCC |  DE | 1st Sept 1993 |
| 141.170.224.0/19 | 8.2k | RIPE NCC |  UA | 4th Jul 2011 |
| 141.173.0.0/16 | 65.5k | ARIN | US | 24th Jan 1992 |
| 141.177.0.0/16 | 65.5k | ARIN | US | 30th Jan 1995 |
| 141.178.0.0/16 | 65.5k | APNIC | JP | 26th Feb 1991 |
| 141.180.0.0/16 | 65.5k | ARIN | US | 26th Jul 1990 |
| 141.183.0.0/16 | 65.5k | ARIN | US | 26th Jul 1990 |
| 141.184.0.0/16 | 65.5k | ARIN | US | 26th Jul 1990 |
| 141.193.128.0/22 | 1k | ARIN | CA | 1st Apr 2024 |