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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,985 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 9.194.0.0/16 | 65.5k | ARIN |  US | 16th Dec 1988 |
| 9.197.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.200.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.207.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.208.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.213.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.214.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.216.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.221.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.222.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.224.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.230.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.236.0.0/16 | 65.5k | RIPE NCC | US | 16th Dec 1988 |
| 9.238.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.240.0.0/15 | 131k | RIPE NCC | US | 16th Dec 1988 |
| 9.242.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.247.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.252.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.32.0.0/11 | 2.1M | ARIN | US | 16th Dec 1988 |
| 9.64.0.0/10 | 4.2M | ARIN | US | 16th Dec 1988 |
| 9.8.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.9.0.0/21 | 2k | ARIN | US | 16th Dec 1988 |
| 9.9.10.0/23 | 512 | ARIN | US | 16th Dec 1988 |
| 9.9.12.0/22 | 1k | ARIN | US | 16th Dec 1988 |
| 9.9.128.0/17 | 32.8k | ARIN | US | 16th Dec 1988 |
| 9.9.16.0/20 | 4.1k | ARIN | US | 16th Dec 1988 |
| 9.9.32.0/19 | 8.2k | ARIN | US | 16th Dec 1988 |
| 9.9.64.0/18 | 16.4k | ARIN | US | 16th Dec 1988 |
| 9.9.8.0/24 | 256 | ARIN | US | 16th Dec 1988 |
| 90.96.0.0/16 | 65.5k | RIPE NCC | US | 2nd Mar 2006 |
| 91.194.32.0/23 | 512 | RIPE NCC | US | 24th May 2007 |
| 91.198.174.0/24 | 256 | RIPE NCC | US | 2nd Oct 2007 |
| 91.201.170.0/24 | 256 | RIPE NCC | US | 14th Aug 2020 |
| 91.205.100.0/22 | 1k | RIPE NCC | US | 29th Aug 2008 |
| 91.208.236.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.240.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.245.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.246.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.69.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.91.0/24 | 256 | RIPE NCC | US | 30th Jul 2008 |
| 91.213.134.0/24 | 256 | RIPE NCC | US | 30th May 2025 |
| 91.213.214.0/24 | 256 | RIPE NCC | US | 9th Sept 2009 |
| 91.213.3.0/24 | 256 | RIPE NCC | US | 10th Jun 2009 |
| 91.216.105.0/24 | 256 | RIPE NCC | US | 19th May 2010 |
| 91.223.191.0/24 | 256 | RIPE NCC | US | 4th Mar 2011 |
| 91.225.248.0/22 | 1k | RIPE NCC | US | 24th Feb 2011 |
| 91.225.32.0/23 | 512 | ARIN | US | 16th Mar 2017 |
| 91.228.134.0/24 | 256 | RIPE NCC | US | 11th Nov 2019 |
| 91.228.149.0/24 | 256 | RIPE NCC | US | 11th Nov 2019 |
| 91.228.160.0/24 | 256 | RIPE NCC | US | 11th Nov 2019 |