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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 144.79.26.0/23 | 512 | APNIC |  AU | 25th Nov 2025 |
| 144.79.28.0/23 | 512 | APNIC |  CN | 25th Nov 2025 |
| 144.79.4.0/23 | 512 | APNIC | CN | 21st Nov 2025 |
| 144.79.41.0/24 | 256 | APNIC |  BD | 28th Nov 2025 |
| 144.79.42.0/23 | 512 | APNIC | CN | 1st Dec 2025 |
| 144.79.46.0/23 | 512 | APNIC |  PK | 1st Dec 2025 |
| 144.79.48.0/23 | 512 | APNIC |  US | 1st Dec 2025 |
| 144.79.50.0/24 | 256 | APNIC |  ID | 2nd Dec 2025 |
| 144.79.73.0/24 | 256 | APNIC | ID | 5th Dec 2025 |
| 144.79.84.0/23 | 512 | APNIC | CN | 8th Dec 2025 |
| 144.79.88.0/24 | 256 | APNIC | ID | 8th Dec 2025 |
| 144.8.0.0/16 | 65.5k | ARIN | US | 31st Oct 1990 |
| 144.86.152.0/22 | 1k | ARIN | US | 11th May 2020 |
| 144.86.226.0/23 | 512 | ARIN | US | 20th Nov 1990 |
| 144.86.239.0/24 | 256 | ARIN | US | 20th Nov 2020 |
| 144.86.240.0/22 | 1k | ARIN | US | 20th Nov 1990 |
| 144.86.244.0/23 | 512 | ARIN | US | 20th Nov 1990 |
| 144.86.248.0/23 | 512 | ARIN | US | 20th Nov 1990 |
| 144.86.251.0/24 | 256 | ARIN | US | 20th Nov 1990 |
| 144.86.252.0/22 | 1k | ARIN | US | 20th Nov 1990 |
| 144.89.128.0/17 | 32.8k | APNIC |  SG | 20th Nov 1990 |
| 144.89.96.0/19 | 8.2k | ARIN | US | 20th Nov 1990 |
| 144.90.0.0/16 | 65.5k | ARIN | US | 16th Jun 2026 |
| 144.97.0.0/16 | 65.5k | APNIC | AU | 28th Nov 1990 |
| 144.98.0.0/16 | 65.5k | RIPE NCC |  HK | 1st Jan 1984 |
| 145.11.128.0/17 | 32.8k | RIPE NCC |  NL | 1st Sept 1993 |
| 145.11.16.0/21 | 2k | RIPE NCC |  AT | 1st Sept 1993 |
| 145.112.0.0/14 | 262k | RIPE NCC | NL | 1st Sept 1993 |
| 145.131.48.0/20 | 4.1k | RIPE NCC | NL | 1st Sept 1993 |
| 145.134.0.0/15 | 131k | RIPE NCC | NL | 1st Sept 1993 |
| 145.14.130.0/24 | 256 | RIPE NCC |  DE | 1st Sept 1993 |
| 145.16.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.224.48.0/20 | 4.1k | RIPE NCC |  CH | 6th May 1993 |
| 145.227.0.0/16 | 65.5k | RIPE NCC |  GB | 13th Oct 1993 |
| 145.229.0.0/16 | 65.5k | RIPE NCC | GB | 7th Jun 1993 |
| 145.231.0.0/16 | 65.5k | RIPE NCC |  FR | 9th Jun 1993 |
| 145.252.0.0/16 | 65.5k | RIPE NCC | CH | 10th Nov 1993 |
| 145.255.224.0/21 | 2k | RIPE NCC | DE | 23rd Nov 2011 |
| 145.26.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.27.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.40.0.0/20 | 4.1k | RIPE NCC | NL | 1st Sept 1993 |
| 145.42.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.47.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.54.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.63.160.0/19 | 8.2k | RIPE NCC | NL | 1st Sept 1993 |
| 145.63.208.0/20 | 4.1k | RIPE NCC | NL | 1st Sept 1993 |
| 145.63.224.0/19 | 8.2k | RIPE NCC | NL | 1st Sept 1993 |
| 145.65.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.67.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.70.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |