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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,300 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.86.155.0/24 | 256 | ARIN |  US | 6th Dec 1990 |
| 192.86.156.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.157.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.159.0/24 | 256 | ARIN | US | 6th Dec 1990 |
| 192.86.16.0/24 | 256 | ARIN | US | 16th Nov 1990 |
| 192.86.160.0/23 | 512 | ARIN | US | 29th Jan 2015 |
| 192.86.162.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.86.164.0/24 | 256 | ARIN | US | 10th Dec 1990 |
| 192.86.168.0/24 | 256 | ARIN | US | 11th Dec 1990 |
| 192.86.19.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.20.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.228.0/24 | 256 | ARIN | US | 12th Dec 1990 |
| 192.86.229.0/24 | 256 | ARIN | US | 12th Dec 1990 |
| 192.86.23.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.26.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.28.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.29.0/24 | 256 | ARIN | US | 17th Nov 1990 |
| 192.86.5.0/24 | 256 | ARIN | US | 13th Nov 1990 |
| 192.86.6.0/24 | 256 | ARIN | US | 16th Nov 1990 |
| 192.86.7.0/24 | 256 | ARIN | US | 16th Nov 1990 |
| 192.86.8.0/24 | 256 | ARIN | US | 16th Nov 1990 |
| 192.86.80.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.82.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.83.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.84.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.87.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 192.86.9.0/24 | 256 | ARIN | US | 16th Nov 1990 |
| 192.86.90.0/24 | 256 | ARIN | US | 22nd Sept 1995 |
| 192.86.91.0/24 | 256 | ARIN | US | 30th Nov 1990 |
| 192.88.103.0/24 | 256 | ARIN | US | 8th Dec 2022 |
| 192.88.104.0/24 | 256 | ARIN | US | 13th Dec 1990 |
| 192.88.106.0/24 | 256 | ARIN | US | 12th Dec 1990 |
| 192.88.107.0/24 | 256 | ARIN | US | 12th Dec 1990 |
| 192.88.112.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.113.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.117.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.120.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.122.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.125.0/24 | 256 | ARIN | US | 26th Mar 1991 |
| 192.88.129.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.88.13.0/24 | 256 | ARIN | US | 5th Dec 1990 |
| 192.88.131.0/24 | 256 | ARIN | US | 19th Dec 1990 |
| 192.88.14.0/24 | 256 | ARIN | US | 5th Dec 1990 |
| 192.88.143.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.144.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.145.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.146.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.147.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.148.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.149.0/24 | 256 | ARIN | US | 20th Dec 1990 |