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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.152.80.0/24 | 256 | ARIN |  US | 9th Apr 1992 |
| 192.152.81.0/24 | 256 | ARIN | US | 9th Apr 1992 |
| 192.152.82.0/24 | 256 | RIPE NCC |  DE | 9th Apr 1992 |
| 192.152.89.0/24 | 256 | ARIN | US | 9th Apr 1992 |
| 192.152.9.0/24 | 256 | ARIN | US | 30th Mar 1992 |
| 192.152.90.0/24 | 256 | ARIN | US | 14th Apr 1992 |
| 192.152.92.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.152.93.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.152.94.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.152.95.0/24 | 256 | ARIN | US | 17th Sept 2019 |
| 192.152.99.0/24 | 256 | ARIN | US | 2nd Nov 1992 |
| 192.153.1.0/24 | 256 | ARIN | US | 27th Mar 1992 |
| 192.153.10.0/24 | 256 | ARIN | US | 31st Mar 1992 |
| 192.153.11.0/24 | 256 | ARIN | US | 31st Mar 1992 |
| 192.153.113.0/24 | 256 | APNIC |  JP | 29th Jun 1993 |
| 192.153.115.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.116.0/24 | 256 | RIPE NCC |  HU | 1st Apr 1992 |
| 192.153.119.0/24 | 256 | LACNIC |  CL | 1st Apr 1992 |
| 192.153.122.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.123.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.125.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.126.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.128.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.130.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.131.0/24 | 256 | ARIN | US | 1st Apr 1992 |
| 192.153.15.0/24 | 256 | ARIN | US | 31st Mar 1992 |
| 192.153.154.0/24 | 256 | ARIN | US | 6th Dec 2017 |
| 192.153.16.0/24 | 256 | ARIN | US | 31st Mar 1992 |
| 192.153.160.0/24 | 256 | ARIN | US | 2nd Apr 1992 |
| 192.153.165.0/24 | 256 | ARIN | US | 3rd Apr 1992 |
| 192.153.166.0/24 | 256 | RIPE NCC |  GB | 3rd Apr 1992 |
| 192.153.167.0/24 | 256 | LACNIC |  CR | 3rd Apr 1992 |
| 192.153.168.0/24 | 256 | RIPE NCC |  BE | 3rd Apr 1992 |
| 192.153.169.0/24 | 256 | ARIN | US | 3rd Apr 1992 |
| 192.153.170.0/24 | 256 | ARIN | US | 3rd Apr 1992 |
| 192.153.176.0/24 | 256 | RIPE NCC |  AT | 6th Apr 1992 |
| 192.153.178.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.179.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.180.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.181.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.182.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.183.0/24 | 256 | ARIN | US | 6th Apr 1992 |
| 192.153.188.0/24 | 256 | RIPE NCC |  SE | 7th Apr 1992 |
| 192.153.189.0/24 | 256 | RIPE NCC | GB | 8th Apr 1992 |
| 192.153.19.0/24 | 256 | RIPE NCC | HU | 31st Mar 1992 |
| 192.153.190.0/24 | 256 | ARIN | US | 8th Apr 1992 |
| 192.153.195.0/24 | 256 | ARIN | US | 8th Apr 1992 |
| 192.153.198.0/24 | 256 | ARIN | US | 9th Apr 1992 |
| 192.153.199.0/24 | 256 | ARIN | US | 13th Apr 1992 |
| 192.153.2.0/24 | 256 | RIPE NCC | GB | 25th Apr 1997 |