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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.19.49.0/24 | 256 | APNIC |  AU | 23rd Aug 1995 |
| 203.19.66.0/24 | 256 | APNIC | AU | 29th Jul 2010 |
| 203.19.73.0/24 | 256 | APNIC | AU | 30th Aug 1995 |
| 203.19.75.0/24 | 256 | APNIC | AU | 31st Aug 1995 |
| 203.19.78.0/24 | 256 | APNIC | AU | 31st Aug 1995 |
| 203.19.79.0/24 | 256 | APNIC | AU | 31st Aug 1995 |
| 203.19.96.0/22 | 1k | APNIC | AU | 31st Aug 1995 |
| 203.191.132.0/24 | 256 | APNIC | AU | 8th Sept 2010 |
| 203.195.126.0/24 | 256 | APNIC | AU | 11th Aug 2026 |
| 203.2.128.0/23 | 512 | APNIC | AU | 6th Jan 1994 |
| 203.2.132.0/24 | 256 | APNIC | AU | 31st Mar 2011 |
| 203.2.135.0/24 | 256 | APNIC | AU | 14th Jan 1994 |
| 203.2.146.0/23 | 512 | APNIC | AU | 21st Jan 1994 |
| 203.2.210.0/24 | 256 | APNIC | AU | 15th Aug 1995 |
| 203.2.212.0/23 | 512 | APNIC | AU | 11th Feb 1994 |
| 203.2.219.0/24 | 256 | APNIC | AU | 11th Feb 1994 |
| 203.2.230.0/24 | 256 | APNIC | AU | 25th Feb 1994 |
| 203.2.232.0/22 | 1k | APNIC | AU | 25th Feb 1994 |
| 203.2.76.0/22 | 1k | APNIC | AU | 22nd Dec 1993 |
| 203.2.96.0/20 | 4.1k | APNIC | AU | 22nd Dec 1993 |
| 203.20.125.0/24 | 256 | APNIC | AU | 6th Jul 2010 |
| 203.20.200.0/21 | 2k | APNIC | AU | 12th Oct 1995 |
| 203.20.252.0/22 | 1k | APNIC | AU | 17th Oct 1995 |
| 203.20.45.0/24 | 256 | APNIC | AU | 22nd Sept 1995 |
| 203.20.49.0/24 | 256 | APNIC | AU | 21st May 2007 |
| 203.20.56.0/24 | 256 | APNIC | AU | 26th Sept 1995 |
| 203.20.64.0/24 | 256 | APNIC | AU | 3rd Oct 1995 |
| 203.20.72.0/24 | 256 | APNIC | AU | 4th Oct 1995 |
| 203.20.88.0/24 | 256 | APNIC | AU | 5th Oct 1995 |
| 203.20.96.0/24 | 256 | APNIC | AU | 5th Oct 1995 |
| 203.20.98.0/24 | 256 | APNIC | AU | 5th Oct 1995 |
| 203.21.108.0/22 | 1k | APNIC | AU | 16th Apr 2010 |
| 203.21.128.0/23 | 512 | APNIC | AU | 2nd Nov 1995 |
| 203.21.156.0/22 | 1k | APNIC | AU | 14th Nov 1995 |
| 203.21.160.0/20 | 4.1k | APNIC | AU | 10th Nov 1995 |
| 203.21.17.0/24 | 256 | APNIC | AU | 20th Oct 1995 |
| 203.21.224.0/19 | 8.2k | APNIC | AU | 14th Nov 1995 |
| 203.21.39.0/24 | 256 | APNIC | AU | 23rd Oct 1995 |
| 203.21.67.0/24 | 256 | APNIC | AU | 25th Oct 1995 |
| 203.21.69.0/24 | 256 | APNIC | AU | 25th Oct 1995 |
| 203.21.70.0/23 | 512 | APNIC | AU | 25th Oct 1995 |
| 203.217.141.0/24 | 256 | APNIC | AU | 30th Jun 2009 |
| 203.217.162.0/23 | 512 | APNIC | AU | 7th Mar 2016 |
| 203.22.107.0/24 | 256 | APNIC | AU | 23rd Nov 1995 |
| 203.22.112.0/22 | 1k | APNIC | AU | 23rd Nov 1995 |
| 203.22.128.0/24 | 256 | APNIC | AU | 28th Nov 1995 |
| 203.22.129.0/24 | 256 | APNIC | AU | 1st Dec 1995 |
| 203.22.130.0/24 | 256 | APNIC | AU | 1st Dec 1995 |
| 203.22.136.0/21 | 2k | APNIC | AU | 1st Dec 1995 |
| 203.22.16.0/23 | 512 | APNIC | AU | 14th Nov 1995 |