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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.188.134.192/29 | 8 | RIPE NCC |  CY | 14th Sept 2012 |
| 193.188.137.0/24 | 256 | RIPE NCC |  HU | 23rd Jul 1997 |
| 193.188.138.0/23 | 512 | RIPE NCC |  DE | 15th Oct 2019 |
| 193.188.142.0/23 | 512 | RIPE NCC |  KW | 7th Oct 1994 |
| 193.188.152.0/23 | 512 | RIPE NCC | KW | 7th Oct 1994 |
| 193.188.201.0/24 | 256 | RIPE NCC |  SE | 27th Mar 1996 |
| 193.188.202.0/23 | 512 | RIPE NCC | SE | 27th Mar 1996 |
| 193.188.224.0/20 | 4.1k | RIPE NCC |  CH | 12th Jan 1996 |
| 193.188.253.0/24 | 256 | RIPE NCC |  PL | 12th May 2005 |
| 193.188.4.0/24 | 256 | RIPE NCC | SE | 1st Sept 1993 |
| 193.188.5.0/24 | 256 | RIPE NCC | SE | 1st Sept 1993 |
| 193.188.6.0/24 | 256 | RIPE NCC | SE | 1st Sept 1993 |
| 193.189.106.0/23 | 512 | RIPE NCC | DE | 2nd May 2005 |
| 193.189.138.0/24 | 256 | RIPE NCC |  RU | 3rd Sept 2012 |
| 193.189.140.0/24 | 256 | RIPE NCC |  GB | 3rd May 2005 |
| 193.189.150.0/23 | 512 | RIPE NCC | DE | 24th Sept 1996 |
| 193.189.70.0/23 | 512 | RIPE NCC |  RO | 11th Apr 2005 |
| 193.189.82.0/23 | 512 | RIPE NCC | DE | 26th Apr 2005 |
| 193.189.84.0/23 | 512 | RIPE NCC | DE | 15th Oct 2019 |
| 193.189.90.0/23 | 512 | RIPE NCC |  DK | 15th Oct 2019 |
| 193.19.0.0/19 | 8.2k | RIPE NCC | DE | 22nd Sept 1992 |
| 193.19.122.0/23 | 512 | RIPE NCC | PL | 22nd Dec 2003 |
| 193.19.140.0/22 | 1k | RIPE NCC | PL | 3rd Dec 2003 |
| 193.19.156.0/22 | 1k | RIPE NCC | GB | 5th Dec 2003 |
| 193.19.232.0/22 | 1k | AFRINIC |  EG | 20th Sept 2007 |
| 193.19.32.0/19 | 8.2k | RIPE NCC |  FR | 31st May 1994 |
| 193.19.68.0/23 | 512 | RIPE NCC | RU | 21st Nov 2003 |
| 193.19.72.0/23 | 512 | RIPE NCC |  PS | 4th Oct 2019 |
| 193.19.96.0/23 | 512 | RIPE NCC | PS | 4th Oct 2019 |
| 193.19.98.0/24 | 256 | RIPE NCC |  LU | 10th Jul 2023 |
| 193.19.99.0/24 | 256 | RIPE NCC |  LT | 10th Jul 2023 |
| 193.192.12.0/26 | 64 | RIPE NCC |  CZ | 11th Nov 2024 |
| 193.192.12.128/25 | 128 | RIPE NCC | CY | 14th Sept 2012 |
| 193.192.12.64/26 | 64 | RIPE NCC | GB | 18th Nov 2024 |
| 193.192.128.0/19 | 8.2k | RIPE NCC | RU | 14th May 1996 |
| 193.192.13.0/24 | 256 | RIPE NCC | GB | 15th Nov 1999 |
| 193.192.16.0/20 | 4.1k | RIPE NCC | GB | 6th Jun 1996 |
| 193.192.34.0/23 | 512 | RIPE NCC | GB | 4th Aug 2005 |
| 193.193.161.0/24 | 256 | RIPE NCC | DK | 6th Jul 2026 |
| 193.193.164.0/24 | 256 | RIPE NCC |  SC | 18th Nov 2019 |
| 193.193.188.0/23 | 512 | RIPE NCC | GB | 27th Apr 2000 |
| 193.193.32.0/19 | 8.2k | RIPE NCC | GB | 22nd May 1996 |
| 193.194.105.0/24 | 256 | RIPE NCC | RU | 5th Sept 2011 |
| 193.194.128.0/24 | 256 | AFRINIC |  GH | 20th Sept 2007 |
| 193.194.146.0/24 | 256 | RIPE NCC |  AT | 5th Mar 1999 |
| 193.194.158.0/24 | 256 | RIPE NCC |  US | 29th Jul 1999 |
| 193.194.192.0/18 | 16.4k | RIPE NCC | SE | 18th Mar 1996 |
| 193.194.22.0/23 | 512 | RIPE NCC | GB | 29th Apr 1997 |
| 193.194.24.0/21 | 2k | RIPE NCC | GB | 29th Apr 1997 |
| 193.194.6.0/23 | 512 | RIPE NCC | DE | 1st Aug 1997 |