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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,971 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 134.128.32.0/19 | 8.2k | ARIN |  US | 20th Mar 2014 |
| 134.13.0.0/16 | 65.5k | ARIN | US | 18th Jul 2018 |
| 134.133.0.0/16 | 65.5k | ARIN | US | 8th Jun 1989 |
| 134.136.0.0/16 | 65.5k | ARIN | US | 8th Jun 1989 |
| 134.14.0.0/15 | 131k | ARIN | US | 12th Apr 1989 |
| 134.177.0.0/16 | 65.5k | ARIN | US | 2nd Aug 2011 |
| 134.189.0.0/16 | 65.5k | ARIN | US | 10th Jul 1989 |
| 134.195.103.0/24 | 256 | ARIN | US | 25th Aug 2020 |
| 134.195.108.0/22 | 1k | ARIN | US | 25th Jun 2020 |
| 134.195.120.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.195.122.0/24 | 256 | ARIN | US | 26th Jun 2020 |
| 134.195.123.0/24 | 256 | ARIN | US | 7th Jul 2020 |
| 134.195.16.0/23 | 512 | ARIN | US | 11th Aug 2020 |
| 134.195.18.0/24 | 256 | ARIN | US | 16th Jul 2020 |
| 134.195.180.0/23 | 512 | ARIN | US | 29th Jun 2020 |
| 134.195.193.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.195.204.0/24 | 256 | ARIN | US | 13th Jul 2020 |
| 134.195.205.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.195.244.0/24 | 256 | ARIN | US | 1st Jul 2020 |
| 134.195.253.0/24 | 256 | ARIN | US | 26th Jun 2020 |
| 134.195.69.0/24 | 256 | ARIN | US | 26th Jun 2020 |
| 134.195.70.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.200.0.0/16 | 65.5k | ARIN | US | 17th Jul 1989 |
| 134.218.0.0/16 | 65.5k | ARIN | US | 25th Jul 1989 |
| 134.23.0.0/16 | 65.5k | ARIN | US | 9th Dec 2022 |
| 134.232.0.0/16 | 65.5k | ARIN | US | 7th Aug 1989 |
| 134.242.0.0/20 | 4.1k | ARIN | US | 15th Aug 1989 |
| 134.242.120.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.124.0/23 | 512 | ARIN | US | 15th Aug 1989 |
| 134.242.127.0/24 | 256 | ARIN | US | 15th Aug 1989 |
| 134.242.144.0/20 | 4.1k | ARIN | US | 15th Aug 1989 |
| 134.242.16.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.160.0/19 | 8.2k | ARIN | US | 15th Aug 1989 |
| 134.242.195.0/24 | 256 | ARIN | US | 15th Aug 1989 |
| 134.242.196.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.200.0/21 | 2k | ARIN | US | 15th Aug 1989 |
| 134.242.208.0/20 | 4.1k | ARIN | US | 15th Aug 1989 |
| 134.242.23.0/24 | 256 | ARIN | US | 15th Aug 1989 |
| 134.242.232.0/22 | 1k | APNIC | US | 15th Aug 1989 |
| 134.242.236.0/23 | 512 | APNIC | US | 15th Aug 1989 |
| 134.242.238.0/24 | 256 | APNIC | US | 15th Aug 1989 |
| 134.242.240.0/20 | 4.1k | APNIC | US | 15th Aug 1989 |
| 134.242.26.0/23 | 512 | ARIN | US | 15th Aug 1989 |
| 134.242.28.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.32.0/20 | 4.1k | ARIN | US | 15th Aug 1989 |
| 134.242.48.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.56.0/21 | 2k | ARIN | US | 15th Aug 1989 |
| 134.242.96.0/21 | 2k | ARIN | US | 15th Aug 1989 |
| 134.248.0.0/16 | 65.5k | ARIN | US | 22nd Aug 1989 |
| 134.26.0.0/16 | 65.5k | ARIN | US | 20th Apr 1989 |