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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,963 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 168.192.0.0/15 | 131k | ARIN |  US | 29th Sept 2022 |
| 168.204.0.0/16 | 65.5k | ARIN | US | 28th Jun 1994 |
| 168.207.0.0/16 | 65.5k | ARIN | US | 6th Jul 1994 |
| 168.213.128.0/18 | 16.4k | ARIN | US | 18th Jul 1994 |
| 168.213.192.0/19 | 8.2k | ARIN | US | 18th Jul 1994 |
| 168.213.224.0/20 | 4.1k | ARIN | US | 18th Jul 1994 |
| 168.213.240.0/21 | 2k | ARIN | US | 18th Jul 1994 |
| 168.213.248.0/22 | 1k | ARIN | US | 18th Jul 1994 |
| 168.213.252.0/24 | 256 | ARIN | US | 18th Jul 1994 |
| 168.220.64.0/20 | 4.1k | ARIN | US | 4th Aug 1994 |
| 168.237.0.0/16 | 65.5k | ARIN | US | 2nd Sept 1994 |
| 168.239.0.0/16 | 65.5k | ARIN | US | 7th Sept 1994 |
| 168.245.144.0/24 | 256 | ARIN | US | 23rd Mar 2021 |
| 168.245.156.0/24 | 256 | ARIN | US | 18th Sept 2018 |
| 168.245.194.0/24 | 256 | ARIN | US | 20th Jun 2017 |
| 168.245.216.0/21 | 2k | ARIN | US | 22nd May 2017 |
| 168.245.225.0/24 | 256 | ARIN | US | 15th Mar 2017 |
| 168.245.232.0/23 | 512 | ARIN | US | 18th Mar 2020 |
| 168.64.0.0/16 | 65.5k | ARIN | US | 10th Jan 1994 |
| 168.69.0.0/17 | 32.8k | ARIN | US | 31st Jan 1994 |
| 168.69.192.0/19 | 8.2k | ARIN | US | 31st Jan 1994 |
| 168.69.224.0/20 | 4.1k | ARIN | US | 31st Jan 1994 |
| 168.69.240.0/21 | 2k | ARIN | US | 31st Jan 1994 |
| 168.69.248.0/23 | 512 | ARIN | US | 31st Jan 1994 |
| 168.69.250.0/24 | 256 | ARIN | US | 31st Jan 1994 |
| 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 |
| 169.128.128.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.132.0/22 | 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 |
| 169.128.16.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.160.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 169.128.164.0/22 | 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 |
| 169.128.240.0/22 | 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 |
| 169.128.76.0/22 | 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 |