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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with unannounced space registered through RIPE NCC, largest first.
Unannounced blocks in United States
599 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 185.32.192.0/22 | 1k | RIPE NCC |  US | 8th Aug 2013 |
| 185.40.24.0/22 | 1k | RIPE NCC | US | 11th Nov 2013 |
| 185.42.148.0/22 | 1k | RIPE NCC | US | 27th May 2019 |
| 185.42.204.0/22 | 1k | RIPE NCC | US | 11th Dec 2013 |
| 185.47.100.0/22 | 1k | RIPE NCC | US | 11th Feb 2014 |
| 185.56.200.0/22 | 1k | RIPE NCC | US | 6th May 2014 |
| 185.63.144.0/22 | 1k | RIPE NCC | US | 10th Jul 2014 |
| 185.69.156.0/22 | 1k | RIPE NCC | US | 9th Sept 2014 |
| 185.7.174.0/24 | 256 | RIPE NCC | US | 9th Jan 2025 |
| 185.72.103.0/24 | 256 | RIPE NCC | US | 17th Jan 2025 |
| 185.75.100.0/22 | 1k | RIPE NCC | US | 30th Oct 2014 |
| 185.77.224.0/22 | 1k | RIPE NCC | US | 4th Jul 2019 |
| 185.83.156.0/23 | 512 | RIPE NCC | US | 9th Jan 2015 |
| 185.83.158.0/24 | 256 | RIPE NCC | US | 9th Jan 2015 |
| 185.97.88.0/22 | 1k | RIPE NCC | US | 22nd Apr 2015 |
| 188.210.93.0/24 | 256 | RIPE NCC | US | 8th May 2009 |
| 188.213.23.0/24 | 256 | RIPE NCC | US | 8th May 2009 |
| 188.213.243.0/24 | 256 | RIPE NCC | US | 8th May 2009 |
| 188.241.193.0/24 | 256 | RIPE NCC | US | 23rd Jun 2009 |
| 188.64.143.0/24 | 256 | RIPE NCC | US | 13th Sept 2021 |
| 189.31.208.0/20 | 4.1k | RIPE NCC | US | 13th Mar 2025 |
| 191.217.160.0/20 | 4.1k | RIPE NCC | US | 13th Mar 2025 |
| 191.217.192.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 192.109.25.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 192.76.118.0/23 | 512 | RIPE NCC | US | 21st Nov 2014 |
| 192.76.171.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 192.83.216.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 192.94.78.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 193.0.129.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 193.0.184.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 193.0.212.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 193.0.249.0/24 | 256 | RIPE NCC | US | 15th Aug 2002 |
| 193.104.126.0/24 | 256 | RIPE NCC | US | 17th Aug 2026 |
| 193.105.173.0/24 | 256 | RIPE NCC | US | 6th Aug 2010 |
| 193.105.177.0/24 | 256 | RIPE NCC | US | 15th Nov 2019 |
| 193.110.138.0/24 | 256 | RIPE NCC | US | 14th Jan 2002 |
| 193.110.81.0/24 | 256 | RIPE NCC | US | 11th Oct 2021 |
| 193.141.140.0/23 | 512 | RIPE NCC | US | 1st Sept 1993 |
| 193.194.158.0/24 | 256 | RIPE NCC | US | 29th Jul 1999 |
| 193.200.177.0/24 | 256 | RIPE NCC | US | 15th May 2007 |
| 193.200.184.0/24 | 256 | RIPE NCC | US | 18th May 2007 |
| 193.201.147.224/27 | 32 | RIPE NCC | US | 29th Jun 2004 |
| 193.201.150.0/26 | 64 | RIPE NCC | US | 29th Jun 2004 |
| 193.201.56.0/22 | 1k | RIPE NCC | US | 9th May 2018 |
| 193.227.227.0/24 | 256 | RIPE NCC | US | 17th Jul 2026 |
| 193.23.120.0/24 | 256 | RIPE NCC | US | 29th Jun 2004 |
| 193.254.198.0/23 | 512 | RIPE NCC | US | 22nd Aug 2002 |
| 193.28.106.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |
| 193.28.57.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |
| 193.28.60.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |