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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.105.80.0/20 | 4.1k | ARIN |  US | 26th Mar 1991 |
| 192.105.96.0/21 | 2k | ARIN | US | 26th Mar 1991 |
| 192.107.10.0/24 | 256 | APNIC |  NZ | 10th Jan 2011 |
| 192.107.103.0/24 | 256 | ARIN | US | 6th May 1991 |
| 192.107.104.0/24 | 256 | LACNIC |  NI | 6th May 1991 |
| 192.107.106.0/24 | 256 | ARIN | US | 7th May 1991 |
| 192.107.107.0/24 | 256 | ARIN | US | 5th May 1995 |
| 192.107.109.0/24 | 256 | ARIN | US | 7th May 1991 |
| 192.107.11.0/24 | 256 | RIPE NCC |  GB | 30th Apr 1991 |
| 192.107.115.0/24 | 256 | ARIN | US | 9th May 1991 |
| 192.107.116.0/24 | 256 | ARIN | US | 9th May 1991 |
| 192.107.117.0/24 | 256 | ARIN | US | 9th May 1991 |
| 192.107.119.0/24 | 256 | ARIN | US | 13th May 1991 |
| 192.107.12.0/23 | 512 | RIPE NCC | GB | 30th Apr 1991 |
| 192.107.123.0/24 | 256 | RIPE NCC |  DE | 5th Oct 1993 |
| 192.107.126.0/23 | 512 | RIPE NCC | GB | 14th May 1991 |
| 192.107.128.0/23 | 512 | RIPE NCC | GB | 14th May 1991 |
| 192.107.130.0/24 | 256 | ARIN | US | 16th May 1991 |
| 192.107.132.0/24 | 256 | RIPE NCC | DE | 16th May 1991 |
| 192.107.14.0/24 | 256 | ARIN | US | 30th Apr 1991 |
| 192.107.145.0/24 | 256 | ARIN | US | 16th May 1991 |
| 192.107.146.0/23 | 512 | ARIN | US | 16th May 1991 |
| 192.107.148.0/24 | 256 | ARIN | US | 20th May 1991 |
| 192.107.149.0/24 | 256 | ARIN | US | 20th May 1991 |
| 192.107.15.0/24 | 256 | ARIN | US | 30th Apr 1991 |
| 192.107.169.0/24 | 256 | ARIN | US | 22nd May 1991 |
| 192.107.170.0/24 | 256 | ARIN | US | 22nd May 1991 |
| 192.107.174.0/24 | 256 | RIPE NCC | GB | 24th May 1991 |
| 192.107.177.0/24 | 256 | RIPE NCC |  GR | 24th May 1991 |
| 192.107.179.0/24 | 256 | ARIN | US | 24th May 1991 |
| 192.107.18.0/24 | 256 | ARIN | US | 30th Apr 1991 |
| 192.107.184.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.185.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.187.0/24 | 256 | RIPE NCC |  SE | 30th May 1991 |
| 192.107.188.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.189.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.19.0/24 | 256 | ARIN | US | 30th Apr 1991 |
| 192.107.190.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.192.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.193.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.194.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.195.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.196.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.107.2.0/24 | 256 | RIPE NCC | GB | 24th Apr 1991 |
| 192.107.20.0/22 | 1k | ARIN | US | 30th Apr 1991 |
| 192.107.233.0/24 | 256 | RIPE NCC |  AT | 4th Jun 1991 |
| 192.107.234.0/24 | 256 | ARIN | US | 4th Jun 1991 |
| 192.107.237.0/24 | 256 | ARIN | US | 12th Mar 2015 |
| 192.107.238.0/24 | 256 | ARIN | US | 4th Jun 1991 |
| 192.107.239.0/24 | 256 | ARIN | US | 4th Jun 1991 |