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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.37.112.0/20 | 4.1k | RIPE NCC |  GB | 13th May 1993 |
| 193.37.133.0/24 | 256 | RIPE NCC |  SC | 14th Nov 2019 |
| 193.37.141.0/24 | 256 | RIPE NCC |  RU | 17th Oct 2006 |
| 193.37.144.0/24 | 256 | RIPE NCC |  AT | 18th Oct 2006 |
| 193.37.228.0/24 | 256 | RIPE NCC | GB | 28th May 1993 |
| 193.37.52.0/22 | 1k | RIPE NCC |  RO | 12th Sept 2018 |
| 193.37.96.0/21 | 2k | RIPE NCC |  US | 27th Apr 1993 |
| 193.38.142.0/24 | 256 | RIPE NCC | GB | 16th Jul 1993 |
| 193.38.240.0/22 | 1k | RIPE NCC | RO | 23rd Oct 2018 |
| 193.38.49.0/24 | 256 | RIPE NCC | GB | 14th Jun 1993 |
| 193.38.52.0/24 | 256 | RIPE NCC | GB | 28th Sept 1998 |
| 193.38.54.0/23 | 512 | RIPE NCC |  AE | 9th Oct 2019 |
| 193.39.10.0/24 | 256 | RIPE NCC |  LT | 14th Nov 2019 |
| 193.39.11.0/24 | 256 | RIPE NCC | GB | 4th Aug 1993 |
| 193.39.113.0/24 | 256 | RIPE NCC |  MC | 19th Nov 2019 |
| 193.39.117.0/24 | 256 | RIPE NCC | RO | 31st Oct 2006 |
| 193.39.120.0/21 | 2k | RIPE NCC |  SE | 13th Sept 1993 |
| 193.39.128.0/21 | 2k | RIPE NCC | SE | 13th Sept 1993 |
| 193.39.137.0/24 | 256 | RIPE NCC |  TR | 14th Nov 2019 |
| 193.39.138.0/24 | 256 | RIPE NCC | TR | 14th Nov 2019 |
| 193.39.140.0/24 | 256 | RIPE NCC | SE | 22nd Sept 1993 |
| 193.39.210.0/24 | 256 | RIPE NCC |  DE | 30th Sept 1993 |
| 193.39.211.0/24 | 256 | RIPE NCC | DE | 30th Sept 1993 |
| 193.39.213.0/24 | 256 | RIPE NCC | TR | 14th Nov 2019 |
| 193.39.214.0/24 | 256 | RIPE NCC | DE | 4th Oct 1993 |
| 193.39.224.0/22 | 1k | RIPE NCC | GB | 5th Oct 1993 |
| 193.39.228.0/22 | 1k | RIPE NCC | US | 6th Oct 1993 |
| 193.39.232.0/21 | 2k | RIPE NCC | US | 6th Oct 1993 |
| 193.39.251.0/24 | 256 | RIPE NCC |  NO | 13th Oct 1993 |
| 193.39.73.0/24 | 256 | RIPE NCC | RO | 26th Oct 2006 |
| 193.39.79.0/24 | 256 | RIPE NCC | TR | 24th Aug 2026 |
| 193.39.88.0/22 | 1k | RIPE NCC | RO | 13th Jul 2018 |
| 193.4.32.0/20 | 4.1k | RIPE NCC |  IS | 1st Sept 1993 |
| 193.4.48.0/21 | 2k | RIPE NCC | IS | 1st Sept 1993 |
| 193.41.0.0/23 | 512 | RIPE NCC | GB | 11th Oct 2000 |
| 193.41.129.0/24 | 256 | RIPE NCC |  UA | 13th Nov 2000 |
| 193.41.146.0/23 | 512 | AFRINIC |  DZ | 20th Sept 2007 |
| 193.41.152.0/23 | 512 | RIPE NCC | GB | 24th Nov 2000 |
| 193.41.158.0/23 | 512 | RIPE NCC |  BE | 6th Dec 2000 |
| 193.41.160.0/22 | 1k | RIPE NCC |  ES | 17th Mar 2010 |
| 193.41.182.0/23 | 512 | RIPE NCC |  BG | 17th Jan 2001 |
| 193.41.199.0/24 | 256 | RIPE NCC |  PL | 14th Nov 2019 |
| 193.41.2.0/23 | 512 | RIPE NCC | TR | 11th Oct 2000 |
| 193.41.205.0/24 | 256 | RIPE NCC |  IT | 29th Dec 2000 |
| 193.41.229.0/24 | 256 | RIPE NCC |  GR | 11th Jan 2001 |
| 193.41.231.0/24 | 256 | RIPE NCC | PL | 16th Jan 2001 |
| 193.41.238.0/24 | 256 | RIPE NCC | NO | 12th Jun 2023 |
| 193.41.248.0/24 | 256 | RIPE NCC | US | 5th Jan 2001 |
| 193.41.249.0/24 | 256 | RIPE NCC |  DK | 5th Jan 2001 |
| 193.41.250.0/24 | 256 | RIPE NCC | US | 5th Jan 2001 |