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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.109.242.0/24 | 256 | AFRINIC |  ZA | 3rd Aug 1992 |
| 192.109.247.0/24 | 256 | RIPE NCC |  DE | 1st May 1991 |
| 192.109.249.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.25.0/24 | 256 | RIPE NCC |  US | 12th Nov 2019 |
| 192.109.251.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.26.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.28.0/24 | 256 | RIPE NCC | DE | 19th May 1992 |
| 192.109.29.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.30.0/24 | 256 | RIPE NCC |  CH | 12th Nov 2019 |
| 192.109.32.0/22 | 1k | RIPE NCC | DE | 1st May 1991 |
| 192.109.39.0/24 | 256 | RIPE NCC | DE | 1st Apr 1992 |
| 192.109.43.0/24 | 256 | RIPE NCC | DE | 20th Jan 1993 |
| 192.109.46.0/24 | 256 | RIPE NCC | DE | 22nd Dec 1992 |
| 192.109.47.0/24 | 256 | RIPE NCC | CH | 12th Nov 2019 |
| 192.109.49.0/24 | 256 | RIPE NCC | DE | 12th Feb 1996 |
| 192.109.55.0/24 | 256 | RIPE NCC | DE | 8th Dec 1992 |
| 192.109.57.0/24 | 256 | RIPE NCC | DE | 5th May 1992 |
| 192.109.58.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.59.0/24 | 256 | RIPE NCC | DE | 19th May 1992 |
| 192.109.60.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.62.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.66.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.70.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.72.0/24 | 256 | RIPE NCC | DE | 5th Oct 1992 |
| 192.109.73.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.76.0/24 | 256 | RIPE NCC | DE | 19th Mar 1993 |
| 192.109.78.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.8.0/23 | 512 | RIPE NCC | DE | 1st May 1991 |
| 192.109.80.0/24 | 256 | RIPE NCC | DE | 23rd Sept 1992 |
| 192.109.81.0/24 | 256 | RIPE NCC | DE | 5th May 1992 |
| 192.109.83.0/24 | 256 | RIPE NCC | DE | 13th Apr 1994 |
| 192.109.86.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.87.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.90.0/24 | 256 | RIPE NCC | DE | 25th Feb 1993 |
| 192.109.94.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.95.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.110.0.0/24 | 256 | ARIN | US | 14th Apr 2015 |
| 192.110.1.0/24 | 256 | ARIN | US | 22nd May 1991 |
| 192.110.128.0/20 | 4.1k | ARIN | US | 22nd May 1991 |
| 192.110.148.0/24 | 256 | ARIN | US | 13th Aug 1992 |
| 192.110.149.0/24 | 256 | ARIN | US | 14th Jun 1995 |
| 192.110.150.0/23 | 512 | ARIN | US | 21st Jan 2015 |
| 192.110.152.0/24 | 256 | ARIN | US | 13th Aug 1992 |
| 192.110.154.0/24 | 256 | ARIN | US | 13th Aug 1992 |
| 192.110.155.0/24 | 256 | ARIN | US | 17th Mar 2015 |
| 192.110.168.0/24 | 256 | ARIN | US | 13th Aug 1992 |
| 192.110.169.0/24 | 256 | ARIN | US | 23rd Mar 2015 |
| 192.110.2.0/23 | 512 | ARIN | US | 22nd May 1991 |
| 192.110.222.0/24 | 256 | ARIN | US | 17th Mar 2015 |
| 192.110.223.0/24 | 256 | ARIN | US | 22nd May 1991 |