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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,041 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 162.54.0.0/17 | 32.8k | ARIN |  US | 3rd Aug 1992 |
| 162.54.128.0/17 | 32.8k | ARIN | US | 3rd Aug 1992 |
| 162.56.0.0/16 | 65.5k | APNIC |  IN | 4th Aug 1992 |
| 162.63.0.0/16 | 65.5k | ARIN | US | 12th Aug 1992 |
| 162.64.0.0/16 | 65.5k | ARIN | US | 12th Aug 1992 |
| 162.66.0.0/16 | 65.5k | ARIN | US | 12th Aug 1992 |
| 162.7.0.0/16 | 65.5k | ARIN | US | 17th Jun 1992 |
| 162.76.0.0/16 | 65.5k | ARIN | US | 24th Aug 1992 |
| 162.77.0.0/16 | 65.5k | ARIN | US | 24th Aug 1992 |
| 162.89.16.0/22 | 1k | ARIN | US | 17th Sept 1992 |
| 162.89.24.0/21 | 2k | ARIN | US | 17th Sept 1992 |
| 162.89.32.0/19 | 8.2k | ARIN | US | 17th Sept 1992 |
| 162.91.0.0/16 | 65.5k | ARIN | US | 17th Sept 1992 |
| 163.101.0.0/16 | 65.5k | RIPE NCC |  FR | 1st Apr 2005 |
| 163.103.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.104.0.0/15 | 131k | RIPE NCC | FR | 1st Apr 2005 |
| 163.106.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.110.0.0/15 | 131k | RIPE NCC | FR | 1st Apr 2005 |
| 163.112.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.113.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.114.146.0/23 | 512 | RIPE NCC | FR | 1st Apr 2005 |
| 163.114.148.0/22 | 1k | RIPE NCC | FR | 1st Apr 2005 |
| 163.114.152.0/22 | 1k | RIPE NCC | FR | 1st Apr 2005 |
| 163.114.156.0/23 | 512 | RIPE NCC | FR | 1st Apr 2005 |
| 163.114.158.0/24 | 256 | RIPE NCC | FR | 1st Apr 2005 |
| 163.114.160.0/19 | 8.2k | RIPE NCC | FR | 1st Apr 2005 |
| 163.115.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.115.128.0/18 | 16.4k | RIPE NCC | FR | 1st Apr 2005 |
| 163.115.192.0/18 | 16.4k | RIPE NCC | FR | 1st Apr 2005 |
| 163.120.128.0/17 | 32.8k | RIPE NCC | US | 20th Jul 1992 |
| 163.122.0.0/16 | 65.5k | APNIC |  AU | 20th Jul 1992 |
| 163.123.176.0/24 | 256 | ARIN | US | 12th Oct 2020 |
| 163.123.177.0/24 | 256 | ARIN | US | 29th Sept 2020 |
| 163.123.188.0/24 | 256 | ARIN | US | 8th Oct 2020 |
| 163.123.190.0/24 | 256 | ARIN | US | 19th Nov 2020 |
| 163.123.196.0/24 | 256 | ARIN | US | 30th Sept 2020 |
| 163.123.217.0/24 | 256 | ARIN |  CA | 30th Sept 2020 |
| 163.123.224.0/24 | 256 | ARIN | US | 30th Sept 2020 |
| 163.123.225.0/24 | 256 | ARIN | US | 29th Sept 2020 |
| 163.123.248.0/22 | 1k | ARIN | US | 29th Sept 2020 |
| 163.128.0.0/23 | 512 | APNIC |  KR | 3rd Mar 2026 |
| 163.128.102.0/23 | 512 | APNIC | IN | 24th Mar 2026 |
| 163.128.116.0/23 | 512 | APNIC |  PH | 25th Mar 2026 |
| 163.128.118.0/24 | 256 | APNIC |  JP | 26th Mar 2026 |
| 163.128.119.0/24 | 256 | APNIC | AU | 27th Mar 2026 |
| 163.128.12.0/23 | 512 | APNIC | IN | 5th Mar 2026 |
| 163.128.120.0/23 | 512 | APNIC |  TW | 27th Mar 2026 |
| 163.128.129.0/24 | 256 | APNIC |  ID | 1st Apr 2026 |
| 163.128.136.0/23 | 512 | APNIC | ID | 1st Apr 2026 |
| 163.128.139.0/24 | 256 | APNIC | ID | 1st Apr 2026 |