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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
2,391 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 203.217.141.0/24 | 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 |
| 203.22.164.0/23 | 512 | APNIC | AU | 4th Dec 1995 |
| 203.22.20.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.22.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.220.0/23 | 512 | APNIC | AU | 5th Dec 1995 |
| 203.22.222.0/24 | 256 | APNIC | AU | 16th May 2007 |
| 203.22.229.0/24 | 256 | APNIC | AU | 11th Dec 1995 |
| 203.22.23.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.236.0/22 | 1k | APNIC | AU | 14th Dec 1995 |
| 203.22.25.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.65.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.82.0/24 | 256 | APNIC | AU | 18th Nov 1995 |
| 203.23.100.0/24 | 256 | APNIC | AU | 17th Jan 1996 |
| 203.23.109.0/24 | 256 | APNIC | AU | 17th Jan 1996 |
| 203.23.111.0/24 | 256 | APNIC | AU | 17th Jan 1996 |
| 203.23.122.0/23 | 512 | APNIC | AU | 19th Jan 1996 |
| 203.23.125.0/24 | 256 | APNIC | AU | 22nd Jan 1996 |
| 203.23.129.0/24 | 256 | APNIC | AU | 13th Mar 1996 |
| 203.23.144.0/21 | 2k | APNIC | AU | 22nd Jan 1996 |
| 203.23.185.0/24 | 256 | APNIC | AU | 25th Jan 1996 |
| 203.23.195.0/24 | 256 | APNIC | AU | 31st Jan 1996 |
| 203.23.232.0/24 | 256 | APNIC | AU | 9th Feb 1996 |
| 203.23.233.0/24 | 256 | APNIC | AU | 19th Feb 1996 |
| 203.23.245.0/24 | 256 | APNIC | AU | 19th Feb 1996 |
| 203.23.4.0/24 | 256 | APNIC | AU | 21st Dec 1995 |
| 203.23.43.0/24 | 256 | APNIC | AU | 9th Jan 1996 |
| 203.23.45.0/24 | 256 | APNIC | AU | 9th Jan 1996 |
| 203.23.55.0/24 | 256 | APNIC | AU | 10th Jan 1996 |
| 203.23.68.0/23 | 512 | APNIC | AU | 15th Jan 1996 |
| 203.23.76.0/24 | 256 | APNIC | AU | 15th Jan 1996 |
| 203.23.8.0/24 | 256 | APNIC | AU | 21st Dec 1995 |