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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,993 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2a14:4d00::/29 | 34.4B × /64 | RIPE NCC |  US | 16th Nov 2023 |
| 2a14:5d80::/29 | 34.4B × /64 | RIPE NCC | US | 2nd Jan 2024 |
| 2a14:6d00::/29 | 34.4B × /64 | RIPE NCC | US | 23rd Nov 2023 |
| 2a14:7a40::/29 | 34.4B × /64 | RIPE NCC | US | 11th Jul 2024 |
| 2a14:c080::/29 | 34.4B × /64 | RIPE NCC | US | 29th Jun 2026 |
| 2a14:ca80::/32 | 4.3B × /64 | RIPE NCC | US | 20th Mar 2025 |
| 2a14:d800::/29 | 34.4B × /64 | RIPE NCC | US | 2nd Dec 2024 |
| 31.132.36.0/22 | 1k | RIPE NCC | US | 2nd Oct 2018 |
| 31.220.216.0/21 | 2k | ARIN | US | 4th Dec 2024 |
| 31.220.245.0/24 | 256 | ARIN | US | 4th Dec 2024 |
| 31.25.192.0/22 | 1k | RIPE NCC | US | 8th Mar 2011 |
| 31.99.128.0/20 | 4.1k | ARIN | US | 18th May 2026 |
| 31.99.144.0/21 | 2k | APNIC | US | 25th Nov 2010 |
| 31.99.152.0/24 | 256 | ARIN | US | 18th May 2026 |
| 32.144.0.0/12 | 1M | ARIN | US | 25th Sept 2023 |
| 32.240.0.0/15 | 131k | ARIN | US | 23rd Jun 2023 |
| 34.3.2.0/24 | 256 | ARIN | US | 9th May 2022 |
| 35.128.216.0/21 | 2k | ARIN | US | 1st Apr 1994 |
| 35.128.224.0/19 | 8.2k | ARIN | US | 1st Apr 1994 |
| 35.18.0.0/15 | 131k | ARIN | US | 8th Feb 2024 |
| 35.26.0.0/15 | 131k | ARIN | US | 8th Feb 2024 |
| 35.28.0.0/14 | 262k | ARIN | US | 8th Feb 2024 |
| 35.34.64.0/20 | 4.1k | ARIN | US | 1st Apr 1994 |
| 35.48.0.0/15 | 131k | ARIN | US | 8th Feb 2024 |
| 35.52.0.0/15 | 131k | ARIN | US | 8th Feb 2024 |
| 35.56.0.0/15 | 131k | ARIN | US | 8th Feb 2024 |
| 35.60.0.0/15 | 131k | ARIN | US | 8th Feb 2024 |
| 36.2.112.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 36.2.128.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 36.2.224.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 36.2.32.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 36.3.80.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 37.128.192.0/21 | 2k | ARIN | US | 22nd May 2024 |
| 37.153.132.0/24 | 256 | RIPE NCC | US | 13th Mar 2012 |
| 37.18.176.0/21 | 2k | RIPE NCC | US | 20th Dec 2011 |
| 4.128.0.0/12 | 1M | ARIN | US | 17th Jul 2019 |
| 40.149.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.150.0.0/16 | 65.5k | ARIN | US | 4th Dec 2023 |
| 40.152.0.0/15 | 131k | ARIN | US | 23rd Apr 1991 |
| 40.154.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.158.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.163.0.0/16 | 65.5k | ARIN | US | 18th Feb 2022 |
| 40.186.0.0/15 | 131k | ARIN | US | 4th Dec 2023 |
| 40.189.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.194.0.0/16 | 65.5k | ARIN | US | 16th Jun 2023 |
| 40.195.0.0/16 | 65.5k | ARIN | US | 21st Oct 2022 |
| 40.20.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.202.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |
| 40.203.0.0/16 | 65.5k | ARIN | US | 13th Feb 2023 |
| 40.211.0.0/16 | 65.5k | ARIN | US | 23rd Apr 1991 |