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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.75.108.0/22 | 1k | APNIC |  CN | 19th Sept 2016 |
| 103.75.112.0/22 | 1k | APNIC | CN | 19th Sept 2016 |
| 103.75.120.0/22 | 1k | APNIC | CN | 19th Sept 2016 |
| 103.75.128.0/22 | 1k | APNIC | CN | 19th Sept 2016 |
| 103.75.136.0/23 | 512 | APNIC |  ID | 24th Jan 2023 |
| 103.75.144.0/22 | 1k | APNIC | CN | 20th Sept 2016 |
| 103.75.168.0/22 | 1k | APNIC | ID | 20th Sept 2016 |
| 103.75.175.0/24 | 256 | APNIC |  SG | 22nd Sept 2016 |
| 103.75.176.0/22 | 1k | APNIC |  VN | 21st Sept 2016 |
| 103.75.204.0/22 | 1k | APNIC |  AU | 22nd Sept 2016 |
| 103.75.232.0/22 | 1k | APNIC | ID | 23rd Sept 2016 |
| 103.75.252.0/22 | 1k | APNIC |  JP | 26th Sept 2016 |
| 103.75.36.0/22 | 1k | RIPE NCC |  NL | 15th Sept 2016 |
| 103.75.56.0/22 | 1k | APNIC |  IN | 16th Sept 2016 |
| 103.75.74.0/23 | 512 | APNIC | VN | 8th Sept 2023 |
| 103.75.82.0/23 | 512 | APNIC | CN | 11th Sept 2023 |
| 103.75.88.0/22 | 1k | APNIC | CN | 19th Sept 2016 |
| 103.75.92.0/22 | 1k | APNIC | CN | 19th Sept 2016 |
| 103.76.104.0/23 | 512 | APNIC | ID | 11th Sept 2023 |
| 103.76.126.0/23 | 512 | APNIC | AU | 4th Oct 2016 |
| 103.76.132.0/22 | 1k | APNIC | ID | 3rd Oct 2016 |
| 103.76.166.0/23 | 512 | RIPE NCC |  SA | 6th Oct 2016 |
| 103.76.216.0/22 | 1k | APNIC | CN | 8th Oct 2016 |
| 103.76.246.0/24 | 256 | APNIC | AU | 12th Oct 2016 |
| 103.76.248.0/22 | 1k | APNIC | IN | 10th Oct 2016 |
| 103.76.32.0/22 | 1k | APNIC |  HK | 27th Sept 2016 |
| 103.76.36.0/22 | 1k | APNIC | SG | 27th Sept 2016 |
| 103.76.64.0/22 | 1k | APNIC | CN | 28th Sept 2016 |
| 103.76.68.0/22 | 1k | APNIC | CN | 28th Sept 2016 |
| 103.76.72.0/22 | 1k | APNIC | CN | 28th Sept 2016 |
| 103.76.92.0/22 | 1k | APNIC | CN | 29th Sept 2016 |
| 103.77.113.0/24 | 256 | APNIC | AU | 19th Oct 2016 |
| 103.77.115.0/24 | 256 | APNIC | AU | 19th Oct 2016 |
| 103.77.148.0/22 | 1k | APNIC | CN | 20th Oct 2016 |
| 103.77.156.0/22 | 1k | APNIC | ID | 21st Oct 2016 |
| 103.77.200.0/24 | 256 | APNIC | SG | 20th Oct 2022 |
| 103.77.220.0/22 | 1k | APNIC | CN | 26th Oct 2016 |
| 103.77.248.0/22 | 1k | APNIC | ID | 27th Oct 2016 |
| 103.77.36.0/22 | 1k | APNIC | IN | 14th Oct 2016 |
| 103.77.52.0/22 | 1k | APNIC | CN | 17th Oct 2016 |
| 103.77.56.0/22 | 1k | APNIC | CN | 17th Oct 2016 |
| 103.77.6.0/24 | 256 | APNIC | IN | 19th Oct 2022 |
| 103.77.68.0/23 | 512 | APNIC | AU | 17th Oct 2016 |
| 103.77.7.0/24 | 256 | APNIC | AU | 13th Oct 2016 |
| 103.77.88.0/22 | 1k | APNIC | CN | 18th Oct 2016 |
| 103.77.96.0/22 | 1k | APNIC | IN | 18th Oct 2016 |
| 103.78.100.0/23 | 512 | APNIC | ID | 1st Nov 2016 |
| 103.78.104.0/23 | 512 | APNIC | ID | 1st Nov 2016 |
| 103.78.110.0/24 | 256 | APNIC | ID | 2nd Nov 2016 |
| 103.78.144.0/22 | 1k | APNIC | ID | 4th Nov 2016 |