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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 207.207.207.0/24 | 256 | ARIN |  US | 14th Oct 1996 |
| 207.207.211.0/24 | 256 | ARIN | US | 24th Jun 2026 |
| 207.207.212.0/22 | 1k | ARIN | US | 14th Oct 1996 |
| 207.207.216.0/22 | 1k | ARIN | US | 14th Oct 1996 |
| 207.207.220.0/23 | 512 | ARIN | US | 14th Oct 1996 |
| 207.207.222.0/24 | 256 | RIPE NCC |  GB | 14th Oct 1996 |
| 207.207.223.0/24 | 256 | ARIN | US | 14th Oct 1996 |
| 207.21.228.0/22 | 1k | ARIN |  CA | 19th Jun 2000 |
| 207.21.244.0/24 | 256 | ARIN | CA | 19th Jun 2000 |
| 207.210.122.0/23 | 512 | ARIN | US | 26th Nov 2018 |
| 207.210.124.0/23 | 512 | ARIN | US | 12th Apr 2005 |
| 207.210.76.0/22 | 1k | ARIN | US | 12th Apr 2005 |
| 207.210.93.0/24 | 256 | ARIN | US | 12th Apr 2005 |
| 207.210.94.0/24 | 256 | ARIN | US | 12th Apr 2005 |
| 207.210.97.0/24 | 256 | ARIN | US | 12th Apr 2005 |
| 207.211.224.0/21 | 2k | ARIN |  KY | 23rd Jan 2025 |
| 207.22.192.0/18 | 16.4k | ARIN | US | 27th Dec 2006 |
| 207.221.128.0/17 | 32.8k | ARIN | US | 16th Oct 1996 |
| 207.221.32.0/19 | 8.2k | ARIN | US | 16th Oct 1996 |
| 207.221.64.0/18 | 16.4k | ARIN | US | 16th Oct 1996 |
| 207.222.128.0/19 | 8.2k | ARIN | US | 16th Oct 1996 |
| 207.222.176.0/20 | 4.1k | ARIN | US | 16th Oct 1996 |
| 207.222.224.0/19 | 8.2k | ARIN | US | 16th Oct 1996 |
| 207.222.64.0/18 | 16.4k | ARIN | US | 16th Oct 1996 |
| 207.223.0.0/20 | 4.1k | ARIN | US | 21st Aug 2009 |
| 207.228.204.0/22 | 1k | ARIN | US | 2nd Apr 2024 |
| 207.229.109.0/24 | 256 | ARIN | US | 3rd Aug 2018 |
| 207.229.116.0/24 | 256 | RIPE NCC | US | 30th Dec 1996 |
| 207.229.117.0/24 | 256 | ARIN | US | 21st Nov 2022 |
| 207.229.122.0/24 | 256 | RIPE NCC | US | 30th Dec 1996 |
| 207.229.64.0/24 | 256 | RIPE NCC | GB | 30th Dec 1996 |
| 207.229.80.0/24 | 256 | ARIN | US | 19th Dec 2023 |
| 207.229.82.0/24 | 256 | ARIN | US | 9th Feb 2017 |
| 207.229.83.0/24 | 256 | ARIN | US | 5th Feb 2024 |
| 207.229.94.0/24 | 256 | ARIN | US | 6th Jul 2017 |
| 207.230.160.0/19 | 8.2k | ARIN | US | 15th Nov 2016 |
| 207.231.112.0/20 | 4.1k | ARIN | US | 16th Nov 2004 |
| 207.231.192.0/22 | 1k | ARIN | CA | 5th Mar 1997 |
| 207.241.144.0/20 | 4.1k | ARIN | US | 23rd Apr 2002 |
| 207.241.160.0/21 | 2k | ARIN | US | 22nd Jul 2026 |
| 207.241.168.0/22 | 1k | ARIN | US | 20th Aug 2026 |
| 207.241.176.0/23 | 512 | ARIN | US | 30th Jul 2026 |
| 207.241.186.0/23 | 512 | APNIC |  PG | 11th Feb 1999 |
| 207.241.204.0/22 | 1k | ARIN | US | 16th Oct 2019 |
| 207.241.208.0/20 | 4.1k | ARIN | US | 21st Mar 2001 |
| 207.244.0.0/18 | 16.4k | ARIN | US | 6th Nov 1996 |
| 207.244.128.0/23 | 512 | ARIN | US | 20th May 2025 |
| 207.248.100.0/24 | 256 | LACNIC |  MX | 4th Feb 1997 |
| 207.248.114.0/23 | 512 | LACNIC | MX | 15th Jan 1997 |
| 207.248.120.0/24 | 256 | LACNIC | MX | 31st Dec 1996 |