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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.25.170.0/23 | 512 | APNIC |  AU | 26th Mar 1996 |
| 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 |
| 203.25.226.0/24 | 256 | APNIC | AU | 29th 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 |
| 203.27.108.0/24 | 256 | APNIC | AU | 27th May 1996 |
| 203.27.111.0/24 | 256 | APNIC | AU | 27th May 1996 |
| 203.27.192.0/24 | 256 | APNIC | AU | 27th May 1996 |
| 203.27.194.0/24 | 256 | APNIC | AU | 27th May 1996 |
| 203.27.204.0/24 | 256 | APNIC | AU | 28th May 1996 |
| 203.27.208.0/21 | 2k | APNIC | AU | 28th May 1996 |
| 203.27.219.0/24 | 256 | APNIC | AU | 30th May 1996 |
| 203.27.222.0/24 | 256 | APNIC | AU | 30th May 1996 |
| 203.27.228.0/24 | 256 | APNIC | AU | 30th May 1996 |
| 203.27.237.0/24 | 256 | APNIC | AU | 5th Jun 1996 |
| 203.27.248.0/24 | 256 | APNIC | AU | 5th Jun 1996 |
| 203.27.35.0/24 | 256 | APNIC | AU | 18th Nov 2008 |
| 203.27.41.0/24 | 256 | APNIC | AU | 16th May 1996 |
| 203.27.68.0/24 | 256 | APNIC | AU | 22nd May 1996 |
| 203.27.85.0/24 | 256 | APNIC | AU | 22nd May 1996 |
| 203.27.93.0/24 | 256 | APNIC | AU | 24th May 1996 |
| 203.28.0.0/21 | 2k | APNIC | AU | 5th Jun 1996 |
| 203.28.13.0/24 | 256 | APNIC | AU | 5th Jun 1996 |
| 203.28.141.0/24 | 256 | APNIC | AU | 24th Jun 1996 |