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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks in United States
26,951 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 207.229.108.0/24 | 256 | ARIN | US | 3rd Aug 2018 |
| 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 |
| 207.229.121.0/24 | 256 | ARIN | US | 30th Dec 1996 |
| 207.229.122.0/24 | 256 | RIPE NCC | US | 30th Dec 1996 |
| 207.229.65.0/24 | 256 | ARIN | US | 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 |
| 207.229.86.0/23 | 512 | ARIN | US | 1st Oct 2026 |
| 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 |
| 207.231.160.0/22 | 1k | ARIN | US | 1st Oct 2026 |
| 207.231.164.0/22 | 1k | ARIN | US | 1st Oct 2026 |
| 207.241.160.0/21 | 2k | ARIN | US | 22nd Jul 2026 |
| 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 |
| 207.251.240.0/20 | 4.1k | ARIN | US | 15th Apr 2005 |
| 207.254.104.0/21 | 2k | ARIN | US | 1st Jun 2020 |
| 207.3.0.0/16 | 65.5k | ARIN | US | 13th Dec 1995 |
| 207.32.213.0/24 | 256 | ARIN | US | 4th Oct 2019 |
| 207.32.214.0/23 | 512 | ARIN | US | 21st Oct 2019 |
| 207.34.5.0/24 | 256 | ARIN | US | 25th Mar 2009 |
| 207.39.0.0/16 | 65.5k | ARIN | US | 31st Jan 1996 |
| 207.45.104.0/21 | 2k | ARIN | US | 11th Apr 1996 |
| 207.45.224.0/20 | 4.1k | ARIN | US | 2nd May 1996 |
| 207.45.48.0/21 | 2k | ARIN | US | 13th Feb 1996 |
| 207.45.56.0/21 | 2k | ARIN | US | 29th Feb 1996 |
| 207.45.96.0/21 | 2k | ARIN | US | 13th Mar 1996 |
| 207.47.56.0/24 | 256 | ARIN | US | 18th Jun 2004 |
| 207.51.0.0/16 | 65.5k | ARIN | US | 2nd Feb 1996 |
| 207.52.0.0/16 | 65.5k | ARIN | US | 13th Feb 1996 |
| 207.53.128.0/18 | 16.4k | ARIN | US | 20th Feb 1996 |
| 207.53.248.0/23 | 512 | ARIN | US | 16th Oct 2026 |
| 207.53.250.0/24 | 256 | ARIN | US | 30th Sept 2026 |
| 207.53.251.0/24 | 256 | ARIN | US | 20th Feb 2019 |
| 207.7.0.0/18 | 16.4k | ARIN | US | 21st Dec 1995 |
| 207.71.176.0/20 | 4.1k | ARIN | US | 20th Mar 1996 |
| 207.89.24.0/21 | 2k | ARIN | US | 18th Dec 2015 |
| 207.89.48.0/24 | 256 | ARIN | US | 20th Sept 2016 |
| 207.89.52.0/24 | 256 | ARIN | US | 5th Aug 2016 |
| 207.89.62.0/23 | 512 | ARIN | US | 11th Apr 2016 |
| 207.90.208.0/22 | 1k | ARIN | US | 7th Jan 2022 |