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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,619 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 74.114.32.0/22 | 1k | ARIN |  US | 22nd May 2009 |
| 74.114.40.0/22 | 1k | ARIN | US | 26th May 2009 |
| 74.115.120.0/22 | 1k | ARIN | US | 8th Jul 2009 |
| 74.115.136.0/21 | 2k | ARIN | US | 9th Jul 2009 |
| 74.115.144.0/21 | 2k | ARIN | US | 9th Jul 2009 |
| 74.115.176.0/22 | 1k | ARIN | US | 24th Feb 2023 |
| 74.115.216.0/22 | 1k | ARIN | US | 25th Feb 2014 |
| 74.115.248.0/22 | 1k | ARIN | US | 28th Jan 2025 |
| 74.115.31.0/24 | 256 | ARIN | US | 29th May 2019 |
| 74.115.56.0/21 | 2k | ARIN | US | 25th Jun 2009 |
| 74.115.84.0/22 | 1k | ARIN | US | 29th Jun 2009 |
| 74.116.54.0/24 | 256 | ARIN | US | 3rd Aug 2009 |
| 74.116.60.0/22 | 1k | ARIN | US | 4th Aug 2009 |
| 74.116.64.0/21 | 2k | ARIN | US | 26th Feb 2025 |
| 74.116.76.0/22 | 1k | ARIN | US | 5th Aug 2009 |
| 74.116.8.0/21 | 2k | ARIN | US | 28th Jul 2009 |
| 74.116.84.0/22 | 1k | ARIN | US | 5th Aug 2009 |
| 74.117.114.0/23 | 512 | ARIN | US | 31st Aug 2009 |
| 74.117.116.0/22 | 1k | ARIN | US | 31st Aug 2009 |
| 74.117.191.0/24 | 256 | ARIN | US | 28th Apr 2026 |
| 74.117.200.0/21 | 2k | ARIN | US | 15th Sept 2009 |
| 74.117.64.0/22 | 1k | ARIN | US | 27th Aug 2009 |
| 74.117.80.0/22 | 1k | ARIN | US | 2nd Oct 2020 |
| 74.118.100.0/22 | 1k | ARIN |  CA | 6th Oct 2009 |
| 74.118.132.0/24 | 256 | ARIN | US | 22nd Sept 2017 |
| 74.118.134.0/24 | 256 | ARIN | CA | 26th Dec 2024 |
| 74.118.160.0/21 | 2k | ARIN | US | 13th Oct 2009 |
| 74.118.184.0/22 | 1k | ARIN | US | 15th Oct 2009 |
| 74.118.188.0/22 | 1k | ARIN | US | 15th Oct 2009 |
| 74.118.208.0/22 | 1k | ARIN | US | 16th Oct 2009 |
| 74.118.248.0/22 | 1k | ARIN | CA | 20th Oct 2009 |
| 74.118.36.0/23 | 512 | ARIN | CA | 25th Sept 2009 |
| 74.118.64.0/22 | 1k | ARIN | US | 13th Nov 2020 |
| 74.118.84.0/22 | 1k | ARIN | US | 8th May 2013 |
| 74.119.120.0/22 | 1k | ARIN | CA | 31st Mar 2021 |
| 74.119.136.0/21 | 2k | ARIN | US | 6th Nov 2009 |
| 74.119.172.0/22 | 1k | ARIN | US | 13th Nov 2009 |
| 74.119.192.0/22 | 1k | RIPE NCC |  MD | 16th Nov 2009 |
| 74.119.48.0/22 | 1k | ARIN | US | 19th Dec 2019 |
| 74.120.100.0/22 | 1k | ARIN | US | 4th Dec 2009 |
| 74.120.124.0/22 | 1k | ARIN | US | 7th Dec 2009 |
| 74.120.140.0/22 | 1k | ARIN | US | 8th Dec 2009 |
| 74.120.148.0/22 | 1k | ARIN | US | 10th Dec 2009 |
| 74.120.16.0/22 | 1k | ARIN | US | 6th Apr 2015 |
| 74.120.180.0/22 | 1k | ARIN | US | 16th Dec 2009 |
| 74.120.192.0/21 | 2k | ARIN | US | 17th Dec 2009 |
| 74.120.224.0/21 | 2k | ARIN | US | 22nd Dec 2009 |
| 74.120.236.0/22 | 1k | ARIN | US | 18th Aug 2017 |
| 74.121.104.0/22 | 1k | ARIN | US | 12th Jan 2010 |
| 74.121.112.0/21 | 2k | ARIN | US | 14th Jan 2010 |