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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.24.127.0/24 | 256 | APNIC |  AU | 22nd Feb 1996 |
| 203.24.129.0/24 | 256 | APNIC | AU | 22nd Feb 1996 |
| 203.24.130.0/24 | 256 | APNIC | AU | 22nd Feb 1996 |
| 203.24.143.0/24 | 256 | APNIC | AU | 22nd Feb 1996 |
| 203.24.144.0/24 | 256 | APNIC | AU | 22nd Feb 1996 |
| 203.24.16.0/24 | 256 | APNIC | AU | 19th Feb 1996 |
| 203.24.162.0/24 | 256 | APNIC | AU | 26th Feb 1996 |
| 203.24.172.0/24 | 256 | APNIC | AU | 26th Feb 1996 |
| 203.24.183.0/24 | 256 | APNIC | AU | 26th Feb 1996 |
| 203.24.20.0/24 | 256 | APNIC | AU | 20th Feb 1996 |
| 203.24.208.0/24 | 256 | APNIC | AU | 27th Feb 1996 |
| 203.24.210.0/24 | 256 | APNIC | AU | 27th Feb 1996 |
| 203.24.242.0/23 | 512 | APNIC | AU | 29th Feb 1996 |
| 203.24.55.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.24.59.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.24.68.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.24.96.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.25.102.0/24 | 256 | APNIC | AU | 13th Mar 1996 |
| 203.25.150.0/24 | 256 | APNIC | AU | 21st Mar 1996 |
| 203.25.170.0/23 | 512 | APNIC | AU | 26th Mar 1996 |
| 203.25.173.0/24 | 256 | APNIC | AU | 6th Aug 2010 |
| 203.25.176.0/24 | 256 | APNIC | AU | 26th Mar 1996 |
| 203.25.183.0/24 | 256 | APNIC | AU | 26th Mar 1996 |
| 203.25.194.0/24 | 256 | APNIC | AU | 28th Mar 1996 |
| 203.25.24.0/23 | 512 | APNIC | AU | 5th Mar 1996 |
| 203.25.249.0/24 | 256 | APNIC | AU | 2nd Apr 1996 |
| 203.25.250.0/24 | 256 | APNIC | AU | 2nd Apr 1996 |
| 203.25.251.0/24 | 256 | APNIC | AU | 2nd Apr 1996 |
| 203.25.252.0/24 | 256 | APNIC | AU | 2nd Apr 1996 |
| 203.25.254.0/23 | 512 | APNIC | AU | 2nd Apr 1996 |
| 203.25.47.0/24 | 256 | APNIC | AU | 8th Mar 1996 |
| 203.25.96.0/24 | 256 | APNIC | AU | 12th Mar 1996 |
| 203.26.110.0/24 | 256 | APNIC | AU | 23rd Apr 1996 |
| 203.26.124.0/23 | 512 | APNIC | AU | 31st Mar 2011 |
| 203.26.130.0/24 | 256 | APNIC | AU | 1st May 1996 |
| 203.26.14.0/24 | 256 | APNIC | AU | 4th Apr 1996 |
| 203.26.145.0/24 | 256 | APNIC | AU | 1st May 1996 |
| 203.26.147.0/24 | 256 | APNIC | AU | 1st May 1996 |
| 203.26.156.0/24 | 256 | APNIC | AU | 1st May 1996 |
| 203.26.179.0/24 | 256 | APNIC | AU | 3rd May 1996 |
| 203.26.186.0/24 | 256 | APNIC | AU | 3rd May 1996 |
| 203.26.187.0/24 | 256 | APNIC | AU | 3rd May 1996 |
| 203.26.217.0/24 | 256 | APNIC | AU | 8th May 1996 |
| 203.26.36.0/24 | 256 | APNIC | AU | 9th Apr 1996 |
| 203.26.39.0/24 | 256 | APNIC | AU | 9th Apr 1996 |
| 203.26.42.0/23 | 512 | APNIC | AU | 10th Apr 1996 |
| 203.26.66.0/23 | 512 | APNIC | AU | 18th Apr 1996 |
| 203.26.70.0/24 | 256 | APNIC | AU | 18th Apr 1996 |
| 203.27.100.0/24 | 256 | APNIC | AU | 24th May 1996 |
| 203.27.103.0/24 | 256 | APNIC | AU | 27th May 1996 |