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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 216.10.235.0/24 | 256 | ARIN |  US | 22nd Jul 2011 |
| 216.10.53.0/24 | 256 | ARIN | US | 22nd Mar 2024 |
| 216.10.54.0/24 | 256 | ARIN | US | 22nd Mar 2024 |
| 216.10.62.0/23 | 512 | ARIN | US | 22nd Mar 2024 |
| 216.10.69.0/24 | 256 | ARIN |  CA | 19th Dec 2022 |
| 216.10.77.0/24 | 256 | ARIN | US | 25th Oct 2019 |
| 216.10.80.0/20 | 4.1k | ARIN | US | 7th Sept 2004 |
| 216.105.160.0/22 | 1k | ARIN | US | 29th Jun 2000 |
| 216.105.240.0/20 | 4.1k | ARIN | US | 6th Aug 2003 |
| 216.108.162.0/23 | 512 | ARIN | CA | 9th Oct 1998 |
| 216.109.112.0/20 | 4.1k | ARIN | US | 28th Sept 2000 |
| 216.109.188.0/22 | 1k | ARIN | US | 13th Jan 2026 |
| 216.109.96.0/20 | 4.1k | ARIN | US | 27th Sept 2000 |
| 216.115.189.0/24 | 256 | ARIN | US | 30th Aug 2019 |
| 216.115.32.0/19 | 8.2k | ARIN | US | 9th Nov 1998 |
| 216.116.129.0/24 | 256 | ARIN | CA | 5th Jun 2018 |
| 216.116.131.0/24 | 256 | RIPE NCC |  GB | 1st Jun 2018 |
| 216.116.136.0/22 | 1k | ARIN | CA | 3rd Oct 2024 |
| 216.116.48.0/20 | 4.1k | ARIN | US | 24th Jan 2001 |
| 216.117.217.0/24 | 256 | ARIN | US | 6th Oct 2017 |
| 216.117.218.0/23 | 512 | ARIN | US | 6th Oct 2017 |
| 216.117.250.0/23 | 512 | ARIN | US | 27th Sept 2005 |
| 216.117.26.0/24 | 256 | ARIN | US | 23rd Feb 2000 |
| 216.117.32.0/24 | 256 | ARIN | US | 23rd Feb 2000 |
| 216.117.50.0/23 | 512 | ARIN | US | 23rd Feb 2000 |
| 216.118.0.0/18 | 16.4k | APNIC |  AU | 11th Nov 1998 |
| 216.119.224.0/19 | 8.2k | RIPE NCC |  HK | 16th Nov 2000 |
| 216.120.146.0/23 | 512 | ARIN | US | 30th Mar 2021 |
| 216.120.148.0/22 | 1k | ARIN | US | 2nd Apr 2021 |
| 216.120.164.0/24 | 256 | ARIN | US | 30th Apr 2021 |
| 216.120.186.0/24 | 256 | ARIN | US | 30th Apr 2021 |
| 216.122.64.0/19 | 8.2k | ARIN | US | 7th Sept 2021 |
| 216.126.47.0/24 | 256 | ARIN | CA | 11th Jan 2021 |
| 216.126.48.0/21 | 2k | ARIN | US | 5th Feb 2001 |
| 216.127.96.0/20 | 4.1k | ARIN | US | 3rd Nov 1999 |
| 216.128.112.0/20 | 4.1k | ARIN | US | 9th Sept 2003 |
| 216.129.128.0/20 | 4.1k | ARIN | US | 20th Nov 1998 |
| 216.129.194.0/24 | 256 | ARIN | CA | 25th Jul 2000 |
| 216.129.211.0/24 | 256 | ARIN | CA | 25th Jul 2000 |
| 216.131.128.0/17 | 32.8k | ARIN | US | 24th Nov 1998 |
| 216.133.252.0/23 | 512 | ARIN | US | 18th Nov 1998 |
| 216.133.254.0/24 | 256 | ARIN | US | 18th Nov 1998 |
| 216.137.128.0/20 | 4.1k | ARIN | US | 29th Jun 2006 |
| 216.137.144.0/20 | 4.1k | ARIN | US | 9th Aug 2001 |
| 216.14.128.0/20 | 4.1k | ARIN | CA | 25th Oct 2005 |
| 216.144.0.0/18 | 16.4k | ARIN | US | 10th Jun 2014 |
| 216.144.192.0/19 | 8.2k | ARIN | US | 31st Jul 2000 |
| 216.145.146.0/24 | 256 | ARIN | US | 9th Jun 2006 |
| 216.145.40.0/23 | 512 | ARIN | US | 1st Aug 2000 |
| 216.145.42.0/24 | 256 | ARIN | US | 1st Aug 2000 |