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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks in United States
26,989 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 76.76.9.0/24 | 256 | ARIN |  US | 22nd Feb 2019 |
| 77.95.24.0/21 | 2k | RIPE NCC | US | 29th May 2007 |
| 79.66.0.0/15 | 131k | ARIN | US | 1st Aug 2023 |
| 79.68.0.0/14 | 262k | ARIN | US | 1st Aug 2023 |
| 79.75.0.0/16 | 65.5k | ARIN | US | 1st Aug 2023 |
| 80.70.192.0/20 | 4.1k | RIPE NCC | US | 29th Sept 2009 |
| 80.73.134.0/24 | 256 | ARIN | US | 15th Feb 2024 |
| 80.73.135.0/24 | 256 | RIPE NCC | US | 18th Jun 2001 |
| 81.172.0.0/19 | 8.2k | RIPE NCC | US | 14th Jan 2003 |
| 81.172.116.0/24 | 256 | RIPE NCC | US | 14th Jan 2003 |
| 81.172.48.0/21 | 2k | RIPE NCC | US | 14th Jan 2003 |
| 81.172.56.0/22 | 1k | RIPE NCC | US | 14th Jan 2003 |
| 81.172.66.0/24 | 256 | RIPE NCC | US | 14th Jan 2003 |
| 81.199.144.0/23 | 512 | ARIN | US | 13th Jan 2022 |
| 81.199.36.0/22 | 1k | ARIN | US | 13th Jan 2022 |
| 81.92.244.0/22 | 1k | ARIN | US | 4th Apr 2022 |
| 81.94.96.0/20 | 4.1k | RIPE NCC | US | 14th Aug 2002 |
| 82.158.208.0/20 | 4.1k | RIPE NCC | US | 2nd Dec 2003 |
| 83.118.232.0/21 | 2k | RIPE NCC | US | 16th Dec 2003 |
| 83.151.208.0/20 | 4.1k | ARIN | US | 18th Jun 2024 |
| 84.201.208.0/20 | 4.1k | RIPE NCC | US | 5th Jan 2005 |
| 85.136.88.0/21 | 2k | RIPE NCC | US | 3rd Nov 2004 |
| 85.136.96.0/21 | 2k | RIPE NCC | US | 3rd Nov 2004 |
| 85.137.216.0/22 | 1k | RIPE NCC | US | 3rd Nov 2004 |
| 85.137.224.0/22 | 1k | RIPE NCC | US | 3rd Nov 2004 |
| 85.8.241.0/24 | 256 | RIPE NCC | US | 17th Jul 2026 |
| 86.106.23.0/24 | 256 | RIPE NCC | US | 18th Apr 2005 |
| 86.226.0.0/16 | 65.5k | RIPE NCC | US | 2nd Mar 2005 |
| 87.120.48.0/21 | 2k | ARIN | US | 22nd May 2024 |
| 87.192.0.0/19 | 8.2k | RIPE NCC | US | 3rd Jun 2005 |
| 87.248.192.0/19 | 8.2k | RIPE NCC | US | 22nd Aug 2005 |
| 88.104.0.0/13 | 524k | ARIN | US | 20th Dec 2023 |
| 89.124.224.0/20 | 4.1k | RIPE NCC | US | 8th Mar 2006 |
| 89.35.237.0/24 | 256 | RIPE NCC | US | 29th Nov 2005 |
| 89.39.147.0/24 | 256 | RIPE NCC | US | 29th Nov 2005 |
| 89.41.224.0/20 | 4.1k | ARIN | US | 21st Jun 2021 |
| 89.47.13.0/24 | 256 | RIPE NCC | US | 29th Nov 2005 |
| 89.47.2.0/24 | 256 | RIPE NCC | US | 29th Nov 2005 |
| 89.48.0.0/13 | 524k | ARIN | US | 4th Dec 2024 |
| 9.0.0.0/13 | 524k | ARIN | US | 16th Dec 1988 |
| 9.10.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.12.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.147.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.148.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.150.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.152.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.155.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.16.0.0/12 | 1M | ARIN | US | 16th Dec 1988 |
| 9.172.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.174.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |