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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.33.157.0/24 | 256 | RIPE NCC |  FR | 15th Dec 1987 |
| 192.33.16.0/24 | 256 | RIPE NCC |  GB | 30th Oct 1987 |
| 192.33.160.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.161.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.164.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.165.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.166.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.33.168.0/24 | 256 | ARIN |  US | 26th Jun 2024 |
| 192.33.169.0/24 | 256 | RIPE NCC | FR | 21st Dec 1988 |
| 192.33.170.0/24 | 256 | RIPE NCC | FR | 15th Jul 1988 |
| 192.33.176.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.177.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.178.0/24 | 256 | RIPE NCC | FR | 21st Dec 1988 |
| 192.33.179.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.33.180.0/24 | 256 | RIPE NCC | FR | 21st Dec 1988 |
| 192.33.181.0/24 | 256 | RIPE NCC | FR | 15th Dec 1987 |
| 192.33.188.0/24 | 256 | ARIN | US | 12th Jan 1988 |
| 192.33.190.0/24 | 256 | ARIN | US | 21st Jan 1988 |
| 192.33.2.0/24 | 256 | ARIN | US | 9th Oct 1987 |
| 192.33.20.0/24 | 256 | ARIN | US | 3rd Nov 1987 |
| 192.33.21.0/24 | 256 | ARIN | US | 5th Nov 1987 |
| 192.33.233.0/24 | 256 | RIPE NCC |  NL | 17th May 1990 |
| 192.33.241.0/24 | 256 | ARIN | US | 18th Feb 1988 |
| 192.33.253.0/24 | 256 | ARIN | US | 19th Feb 1988 |
| 192.33.254.0/24 | 256 | RIPE NCC |  DE | 3rd May 1991 |
| 192.33.35.0/24 | 256 | ARIN | US | 30th Sept 1987 |
| 192.33.37.0/24 | 256 | ARIN | US | 8th Oct 1987 |
| 192.33.38.0/23 | 512 | ARIN | US | 8th Oct 1987 |
| 192.33.40.0/21 | 2k | ARIN | US | 8th Oct 1987 |
| 192.33.48.0/20 | 4.1k | ARIN | US | 8th Oct 1987 |
| 192.33.5.0/24 | 256 | ARIN | US | 22nd Oct 1987 |
| 192.33.6.0/24 | 256 | ARIN | US | 22nd Oct 1987 |
| 192.33.64.0/20 | 4.1k | ARIN | US | 8th Oct 1987 |
| 192.33.7.0/24 | 256 | ARIN | US | 22nd Oct 1987 |
| 192.33.8.0/24 | 256 | ARIN | US | 22nd Oct 1987 |
| 192.33.80.0/22 | 1k | ARIN | US | 8th Oct 1987 |
| 192.33.84.0/23 | 512 | ARIN | US | 8th Oct 1987 |
| 192.33.86.0/24 | 256 | ARIN | US | 8th Oct 1987 |
| 192.33.9.0/24 | 256 | ARIN | US | 22nd Oct 1987 |
| 192.34.116.0/24 | 256 | RIPE NCC | NL | 4th Mar 1994 |
| 192.34.145.0/24 | 256 | ARIN | US | 19th Oct 1993 |
| 192.34.168.0/24 | 256 | ARIN | US | 29th May 2014 |
| 192.34.169.0/24 | 256 | ARIN | US | 21st Oct 1988 |
| 192.34.170.0/23 | 512 | ARIN | US | 12th Sept 2014 |
| 192.34.176.0/23 | 512 | ARIN | US | 13th Aug 2014 |
| 192.34.179.0/24 | 256 | RIPE NCC |  FI | 22nd Jan 1997 |
| 192.34.180.0/24 | 256 | ARIN | US | 23rd May 2014 |
| 192.34.181.0/24 | 256 | ARIN | US | 3rd Oct 1994 |
| 192.34.182.0/23 | 512 | ARIN | US | 3rd Oct 1994 |
| 192.34.19.0/24 | 256 | RIPE NCC | GB | 24th Aug 2009 |