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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 163.61.161.64/26 | 64 | APNIC |  PH | 7th Jul 2026 |
| 163.61.210.0/23 | 512 | APNIC |  ID | 21st Feb 2025 |
| 163.61.218.0/23 | 512 | APNIC | ID | 23rd Feb 2025 |
| 163.61.242.0/23 | 512 | APNIC |  VN | 26th Feb 2025 |
| 163.61.246.0/24 | 256 | APNIC |  US | 27th Feb 2025 |
| 163.61.254.0/24 | 256 | APNIC | ID | 3rd Mar 2025 |
| 163.61.255.0/24 | 256 | APNIC | PH | 4th Mar 2025 |
| 163.61.37.0/24 | 256 | APNIC |  JP | 2nd Feb 2025 |
| 163.61.56.0/23 | 512 | APNIC | ID | 5th Feb 2025 |
| 163.61.59.0/24 | 256 | APNIC |  IN | 6th Feb 2025 |
| 163.61.68.0/23 | 512 | APNIC | VN | 6th Feb 2025 |
| 163.61.76.0/24 | 256 | APNIC | ID | 6th Feb 2025 |
| 163.64.0.0/15 | 131k | RIPE NCC |  FR | 1st Apr 2005 |
| 163.67.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.70.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.71.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.72.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.76.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.77.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.78.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.79.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.79.128.0/17 | 32.8k | RIPE NCC | US | 1st Apr 2005 |
| 163.80.0.0/12 | 1M | RIPE NCC | FR | 1st Apr 2005 |
| 163.96.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.97.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.98.0.0/15 | 131k | RIPE NCC | FR | 1st Apr 2005 |
| 164.1.0.0/16 | 65.5k | RIPE NCC | FR | 18th Sept 1992 |
| 164.101.0.0/16 | 65.5k | ARIN | US | 4th Feb 1993 |
| 164.103.0.0/16 | 65.5k | ARIN | US | 8th Feb 1993 |
| 164.109.0.0/16 | 65.5k | ARIN | US | 18th Feb 1993 |
| 164.118.0.0/16 | 65.5k | ARIN | US | 19th Mar 1993 |
| 164.12.0.0/16 | 65.5k | RIPE NCC | US | 2nd Nov 1992 |
| 164.120.0.0/16 | 65.5k | ARIN | US | 8th Mar 1993 |
| 164.123.0.0/16 | 65.5k | ARIN | US | 9th Mar 1993 |
| 164.13.0.0/16 | 65.5k | RIPE NCC |  FI | 4th Nov 1992 |
| 164.135.0.0/16 | 65.5k | RIPE NCC |  SE | 14th Oct 1993 |
| 164.138.202.0/24 | 256 | RIPE NCC |  IR | 10th Jul 2025 |
| 164.142.0.0/16 | 65.5k | RIPE NCC |  IT | 18th Feb 1994 |
| 164.144.0.0/16 | 65.5k | ARIN | US | 9th Mar 1993 |
| 164.152.0.0/22 | 1k | ARIN | US | 12th Mar 1993 |
| 164.152.120.0/23 | 512 | ARIN | US | 12th Mar 1993 |
| 164.152.126.0/23 | 512 | ARIN | US | 12th Mar 1993 |
| 164.152.128.0/22 | 1k | ARIN | US | 12th Mar 1993 |
| 164.152.144.0/21 | 2k | ARIN | US | 12th Mar 1993 |
| 164.152.152.0/22 | 1k | ARIN | US | 12th Mar 1993 |
| 164.152.156.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 164.152.164.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 164.152.176.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 164.152.204.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 164.152.217.0/24 | 256 | ARIN | US | 12th Mar 1993 |