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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 88.104.0.0/13 | 524k | ARIN |  US | 20th Dec 2023 |
| 89.41.224.0/20 | 4.1k | ARIN | US | 21st Jun 2021 |
| 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 |
| 9.180.0.0/14 | 262k | ARIN | US | 16th Dec 1988 |
| 9.184.0.0/16 | 65.5k | ARIN | US | 16th Dec 1988 |
| 9.186.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 9.188.0.0/15 | 131k | ARIN | US | 16th Dec 1988 |
| 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 |
| 9.238.0.0/15 | 131k | ARIN | 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 |
| 91.225.32.0/23 | 512 | ARIN | US | 16th Mar 2017 |
| 91.233.198.0/24 | 256 | ARIN | US | 5th Jun 2023 |
| 91.238.92.0/23 | 512 | ARIN | US | 21st Jan 2025 |
| 92.8.0.0/15 | 131k | ARIN | US | 3rd Mar 2025 |
| 93.72.0.0/15 | 131k | ARIN | US | 4th Mar 2024 |