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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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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 |
|---|---|---|---|---|
| 168.69.251.0/24 | 256 | ARIN |  US | 28th Apr 2021 |
| 168.69.252.0/24 | 256 | ARIN | US | 28th Apr 2021 |
| 168.71.0.0/16 | 65.5k | ARIN | US | 1st Feb 1994 |
| 168.72.0.0/16 | 65.5k | ARIN | US | 1st Feb 1994 |
| 168.74.0.0/16 | 65.5k | ARIN | US | 8th Feb 1994 |
| 168.97.0.0/16 | 65.5k | ARIN | US | 3rd Mar 1994 |
| 169.128.100.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.118.0/23 | 512 | ARIN | US | 23rd Jul 2026 |
| 169.128.120.0/23 | 512 | ARIN | US | 6th Jul 2026 |
| 169.128.128.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.132.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.140.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.144.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.148.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.152.0/22 | 1k | ARIN | US | 6th Jul 2026 |
| 169.128.156.0/23 | 512 | ARIN | US | 1st Jul 2026 |
| 169.128.16.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.160.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.176.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.180.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.184.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.208.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.212.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.240.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.244.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.248.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.28.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.60.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.64.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.68.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.76.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.88.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.134.0.0/16 | 65.5k | ARIN | US | 4th Nov 1994 |
| 169.136.224.0/19 | 8.2k | ARIN | US | 4th Nov 1994 |
| 169.141.0.0/16 | 65.5k | ARIN | US | 8th Nov 1994 |
| 169.148.184.0/22 | 1k | ARIN | US | 11th Jan 2019 |
| 169.150.112.0/20 | 4.1k | ARIN | US | 28th Dec 2021 |
| 169.155.0.0/19 | 8.2k | ARIN | US | 3rd Jan 1995 |
| 169.155.112.0/21 | 2k | ARIN | US | 3rd Jan 1995 |
| 169.155.172.0/22 | 1k | ARIN | US | 3rd Jan 1995 |
| 169.155.176.0/20 | 4.1k | ARIN | US | 3rd Jan 1995 |
| 169.155.32.0/21 | 2k | ARIN | US | 3rd Jan 1995 |
| 169.155.40.0/22 | 1k | ARIN | US | 3rd Jan 1995 |
| 169.155.64.0/20 | 4.1k | ARIN | US | 3rd Jan 1995 |
| 169.155.80.0/21 | 2k | ARIN | US | 3rd Jan 1995 |
| 169.155.96.0/20 | 4.1k | ARIN | US | 3rd Jan 1995 |
| 169.16.0.0/12 | 1M | ARIN | US | 25th Aug 1993 |
| 169.176.0.0/13 | 524k | ARIN | US | 23rd Feb 1995 |
| 169.184.0.0/16 | 65.5k | ARIN | US | 23rd Feb 1995 |
| 169.185.0.0/16 | 65.5k | ARIN | US | 23rd Feb 1995 |