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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,906 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 70.34.62.0/24 | 256 | APNIC |  IN | 12th Mar 2015 |
| 70.34.63.0/24 | 256 | ARIN |  US | 12th Mar 2015 |
| 70.35.145.0/24 | 256 | ARIN | US | 28th Apr 2025 |
| 70.35.153.0/24 | 256 | ARIN | US | 9th Sept 2025 |
| 70.35.155.0/24 | 256 | ARIN | US | 13th May 2025 |
| 70.36.84.0/22 | 1k | ARIN | US | 9th Aug 2010 |
| 70.36.88.0/21 | 2k | ARIN | US | 9th Aug 2010 |
| 70.38.128.0/17 | 32.8k | ARIN | US | 22nd Jul 2008 |
| 70.40.128.0/21 | 2k | RIPE NCC | US | 1st Oct 2008 |
| 70.42.117.0/24 | 256 | ARIN | US | 29th Sept 2005 |
| 70.42.118.0/24 | 256 | ARIN | US | 29th Sept 2005 |
| 70.42.119.0/24 | 256 | ARIN | US | 20th Nov 2023 |
| 70.42.212.0/23 | 512 | ARIN | US | 21st Sept 2023 |
| 70.42.214.0/23 | 512 | ARIN | US | 29th Sept 2005 |
| 70.84.0.0/14 | 262k | ARIN | US | 29th Jul 2004 |
| 71.160.0.0/16 | 65.5k | ARIN | US | 1st Jun 2005 |
| 71.161.80.0/20 | 4.1k | ARIN | US | 1st Jun 2005 |
| 71.169.192.0/18 | 16.4k | ARIN | US | 1st Jun 2005 |
| 71.180.0.0/16 | 65.5k | ARIN | US | 1st Jun 2005 |
| 71.241.160.0/19 | 8.2k | ARIN | US | 9th Nov 2004 |
| 71.254.16.0/20 | 4.1k | ARIN | US | 9th Nov 2004 |
| 72.0.80.0/20 | 4.1k | ARIN | US | 27th Sept 2007 |
| 72.1.40.0/22 | 1k | ARIN | US | 6th Feb 2006 |
| 72.1.44.0/23 | 512 | ARIN | US | 6th Feb 2006 |
| 72.13.64.0/20 | 4.1k | ARIN | US | 5th Nov 2004 |
| 72.13.96.0/20 | 4.1k | ARIN | US | 11th Nov 2004 |
| 72.14.117.0/24 | 256 | ARIN | US | 5th Nov 2004 |
| 72.14.120.0/24 | 256 | ARIN | US | 4th Nov 2020 |
| 72.14.121.0/24 | 256 | ARIN | US | 5th Nov 2004 |
| 72.14.122.0/23 | 512 | ARIN | US | 5th Nov 2004 |
| 72.14.68.0/23 | 512 | ARIN | US | 5th Nov 2004 |
| 72.15.32.0/20 | 4.1k | ARIN | US | 3rd Mar 2006 |
| 72.172.128.0/20 | 4.1k | ARIN | US | 2nd Jan 2007 |
| 72.172.64.0/22 | 1k | ARIN |  CA | 19th Dec 2022 |
| 72.172.80.0/22 | 1k | ARIN | US | 30th Sept 2020 |
| 72.172.90.0/23 | 512 | ARIN | US | 24th Jan 2007 |
| 72.172.92.0/22 | 1k | ARIN | US | 24th Jan 2007 |
| 72.18.92.0/22 | 1k | ARIN | US | 7th Oct 2021 |
| 72.19.12.0/22 | 1k | ARIN | CA | 30th Aug 2019 |
| 72.19.4.0/22 | 1k | ARIN | US | 4th Sept 2019 |
| 72.2.112.0/20 | 4.1k | ARIN | US | 14th May 2008 |
| 72.2.160.0/20 | 4.1k | ARIN | US | 9th Feb 2006 |
| 72.2.180.0/24 | 256 | ARIN | US | 15th Jul 2016 |
| 72.2.192.0/19 | 8.2k | ARIN | US | 13th Oct 2004 |
| 72.22.100.0/22 | 1k | ARIN | US | 13th Jan 2026 |
| 72.22.69.0/24 | 256 | ARIN | US | 18th Jan 2005 |
| 72.22.70.0/23 | 512 | ARIN | US | 18th Jan 2005 |
| 72.22.84.0/23 | 512 | ARIN | US | 18th Jan 2005 |
| 72.22.87.0/24 | 256 | ARIN | US | 18th Jan 2005 |
| 72.22.96.0/22 | 1k | ARIN | US | 13th Jan 2026 |