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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 149.170.229.0/24 | 256 | RIPE NCC |  GB | 9th May 1991 |
| 149.170.230.0/23 | 512 | RIPE NCC | GB | 9th May 1991 |
| 149.170.232.0/21 | 2k | RIPE NCC | GB | 9th May 1991 |
| 149.170.58.0/24 | 256 | RIPE NCC |  SI | 9th May 1991 |
| 149.170.59.0/24 | 256 | RIPE NCC |  IE | 9th May 1991 |
| 149.178.0.0/15 | 131k | RIPE NCC | GB | 13th May 1991 |
| 149.180.128.0/17 | 32.8k | RIPE NCC | GB | 13th May 1991 |
| 149.181.128.0/17 | 32.8k | RIPE NCC | GB | 13th May 1991 |
| 149.182.0.0/15 | 131k | RIPE NCC | GB | 13th May 1991 |
| 149.184.0.0/15 | 131k | RIPE NCC | GB | 13th May 1991 |
| 149.187.0.0/17 | 32.8k | RIPE NCC | GB | 13th May 1991 |
| 149.189.0.0/16 | 65.5k | RIPE NCC | GB | 13th May 1991 |
| 149.19.128.0/20 | 4.1k | RIPE NCC |  DE | 1st Jun 1993 |
| 149.19.144.0/21 | 2k | RIPE NCC | DE | 1st Jun 1993 |
| 149.19.152.0/22 | 1k | RIPE NCC | DE | 1st Jun 1993 |
| 149.19.5.0/24 | 256 | ARIN |  US | 2nd Nov 2020 |
| 149.19.64.0/19 | 8.2k | ARIN | US | 8th Dec 2020 |
| 149.191.0.0/16 | 65.5k | RIPE NCC | GB | 13th May 1991 |
| 149.192.0.0/14 | 262k | RIPE NCC | GB | 13th May 1991 |
| 149.196.0.0/16 | 65.5k | RIPE NCC | GB | 13th May 1991 |
| 149.197.0.0/16 | 65.5k | RIPE NCC |  FI | 13th May 1991 |
| 149.20.224.0/21 | 2k | ARIN | US | 26th Apr 2018 |
| 149.207.0.0/16 | 65.5k | RIPE NCC | DE | 10th Jan 1994 |
| 149.212.0.0/16 | 65.5k | RIPE NCC | DE | 1st Jan 1984 |
| 149.213.0.0/16 | 65.5k | RIPE NCC | DE | 1st Sept 1993 |
| 149.218.128.0/17 | 32.8k | ARIN | US | 7th Aug 2024 |
| 149.232.189.0/24 | 256 | RIPE NCC |  FR | 1st Jan 1984 |
| 149.233.64.0/18 | 16.4k | RIPE NCC | DE | 5th May 1993 |
| 149.234.234.0/23 | 512 | ARIN | US | 25th Jan 2017 |
| 149.234.236.0/22 | 1k | ARIN | US | 25th Jan 2017 |
| 149.245.0.0/16 | 65.5k | RIPE NCC | DE | 1st Sept 1993 |
| 149.246.0.0/16 | 65.5k | RIPE NCC | DE | 28th Sept 1992 |
| 149.248.168.0/23 | 512 | ARIN |  CA | 2nd Sept 2015 |
| 149.248.224.0/21 | 2k | ARIN | CA | 22nd Sept 2020 |
| 149.248.232.0/21 | 2k | ARIN | CA | 9th Jul 2020 |
| 149.248.240.0/21 | 2k | ARIN | CA | 26th Mar 2020 |
| 149.248.248.0/22 | 1k | ARIN | CA | 26th Feb 2020 |
| 149.248.252.0/23 | 512 | ARIN | CA | 2nd Sept 2015 |
| 149.248.254.0/23 | 512 | ARIN | CA | 17th Jan 2020 |
| 149.249.0.0/21 | 2k | RIPE NCC | DE | 1st Sept 1993 |
| 149.249.10.0/23 | 512 | RIPE NCC | DE | 1st Sept 1993 |
| 149.251.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 149.252.0.0/16 | 65.5k | ARIN | US | 9th Aug 1991 |
| 149.255.160.0/21 | 2k | RIPE NCC |  RU | 22nd Aug 2011 |
| 149.39.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.41.0.0/16 | 65.5k | APNIC |  CN | 16th Mar 1993 |
| 149.42.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.45.0.0/16 | 65.5k | ARIN | US | 12th Sept 2018 |
| 149.47.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.49.0.0/16 | 65.5k | RIPE NCC |  IL | 10th Aug 2009 |