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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Australia
2,385 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.30.33.0/24 | 256 | APNIC |  AU | 24th Jul 1996 |
| 203.30.59.0/24 | 256 | APNIC | AU | 5th Aug 1996 |
| 203.30.82.0/23 | 512 | APNIC | AU | 6th Aug 1996 |
| 203.30.85.0/24 | 256 | APNIC | AU | 6th Aug 1996 |
| 203.31.12.0/24 | 256 | APNIC | AU | 13th Sept 1996 |
| 203.31.121.0/24 | 256 | APNIC | AU | 19th Sept 1996 |
| 203.31.122.0/23 | 512 | APNIC | AU | 19th Sept 1996 |
| 203.31.168.0/24 | 256 | APNIC | AU | 19th Sept 1996 |
| 203.31.170.0/24 | 256 | APNIC | AU | 19th Sept 1996 |
| 203.31.190.0/24 | 256 | APNIC | AU | 25th Sept 1996 |
| 203.31.205.0/24 | 256 | APNIC | AU | 25th Sept 1996 |
| 203.31.206.0/23 | 512 | APNIC | AU | 25th Sept 1996 |
| 203.31.230.0/23 | 512 | APNIC | AU | 9th Oct 2007 |
| 203.31.232.0/23 | 512 | APNIC | AU | 25th Sept 1996 |
| 203.31.238.0/23 | 512 | APNIC | AU | 25th Sept 1996 |
| 203.31.24.0/23 | 512 | APNIC | AU | 13th Sept 1996 |
| 203.31.246.0/24 | 256 | APNIC | AU | 25th Sept 1996 |
| 203.31.4.0/23 | 512 | APNIC | AU | 13th Sept 1996 |
| 203.31.47.0/24 | 256 | APNIC | AU | 16th Sept 1996 |
| 203.31.59.0/24 | 256 | APNIC | AU | 16th Sept 1996 |
| 203.31.61.0/24 | 256 | APNIC | AU | 16th Sept 1996 |
| 203.31.66.0/24 | 256 | APNIC | AU | 17th Sept 1996 |
| 203.32.122.0/24 | 256 | APNIC | AU | 1st Oct 1996 |
| 203.32.132.0/24 | 256 | APNIC | AU | 1st Oct 1996 |
| 203.32.136.0/24 | 256 | APNIC | AU | 1st Oct 1996 |
| 203.32.144.0/21 | 2k | APNIC | AU | 2nd Oct 1996 |
| 203.32.159.0/24 | 256 | APNIC | AU | 2nd Oct 1996 |
| 203.32.21.0/24 | 256 | APNIC | AU | 26th Sept 1996 |
| 203.32.219.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.32.220.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.32.26.0/24 | 256 | APNIC | AU | 26th Sept 1996 |
| 203.32.57.0/24 | 256 | APNIC | AU | 26th Sept 1996 |
| 203.32.72.0/23 | 512 | APNIC | AU | 27th Sept 1996 |
| 203.33.107.0/24 | 256 | APNIC | AU | 14th Oct 1996 |
| 203.33.123.0/24 | 256 | APNIC | AU | 15th Oct 1996 |
| 203.33.136.0/22 | 1k | APNIC | AU | 16th Oct 1996 |
| 203.33.144.0/24 | 256 | APNIC | AU | 16th Oct 1996 |
| 203.33.154.0/24 | 256 | APNIC | AU | 17th Oct 1996 |
| 203.33.176.0/24 | 256 | APNIC | AU | 22nd Oct 1996 |
| 203.33.191.0/24 | 256 | APNIC | AU | 22nd Oct 1996 |
| 203.33.20.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.201.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.205.0/24 | 256 | APNIC | AU | 14th Jul 2010 |
| 203.33.217.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.218.0/23 | 512 | APNIC | AU | 25th Oct 1996 |
| 203.33.228.0/23 | 512 | APNIC | AU | 25th Oct 1996 |
| 203.33.232.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.234.0/23 | 512 | APNIC | AU | 25th Oct 1996 |
| 203.33.24.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.242.0/24 | 256 | APNIC | AU | 25th Oct 1996 |