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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.27.111.0/24 | 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 |
| 203.28.172.0/24 | 256 | APNIC | AU | 25th Jun 1996 |
| 203.28.176.0/24 | 256 | APNIC | AU | 25th Jun 1996 |
| 203.28.177.0/24 | 256 | APNIC | AU | 25th Jun 1996 |
| 203.28.186.0/24 | 256 | APNIC | AU | 25th Jun 1996 |
| 203.28.191.0/24 | 256 | APNIC | AU | 26th Jun 1996 |
| 203.28.200.0/24 | 256 | APNIC | AU | 26th Jun 1996 |
| 203.28.206.0/24 | 256 | APNIC | AU | 26th Jun 1996 |
| 203.28.208.0/22 | 1k | APNIC | AU | 26th Jun 1996 |
| 203.28.212.0/24 | 256 | APNIC | AU | 26th Jun 1996 |
| 203.28.41.0/24 | 256 | APNIC | AU | 6th Jun 1996 |
| 203.28.45.0/24 | 256 | APNIC | AU | 6th Jun 1996 |
| 203.28.75.0/24 | 256 | APNIC | AU | 19th Jun 1996 |
| 203.28.94.0/23 | 512 | APNIC | AU | 20th Jun 1996 |
| 203.29.0.0/24 | 256 | APNIC | AU | 27th Jun 1996 |
| 203.29.116.0/23 | 512 | APNIC | AU | 31st May 2007 |
| 203.29.177.0/24 | 256 | APNIC | AU | 11th Jul 1996 |
| 203.29.192.0/21 | 2k | APNIC | AU | 15th Jul 1996 |
| 203.29.204.0/24 | 256 | APNIC | AU | 15th Jul 1996 |
| 203.29.206.0/23 | 512 | APNIC | AU | 15th Jul 1996 |
| 203.29.208.0/23 | 512 | APNIC | AU | 15th Jul 1996 |
| 203.29.219.0/24 | 256 | APNIC | AU | 16th Jul 1996 |
| 203.29.44.0/24 | 256 | APNIC | AU | 8th Jul 1996 |
| 203.29.45.0/24 | 256 | APNIC | AU | 8th Jul 1996 |
| 203.29.51.0/24 | 256 | APNIC | AU | 8th Jul 1996 |
| 203.29.59.0/24 | 256 | APNIC | AU | 9th Jul 1996 |
| 203.29.68.0/24 | 256 | APNIC | AU | 10th Jul 1996 |
| 203.29.76.0/24 | 256 | APNIC | AU | 10th Jul 1996 |
| 203.29.80.0/24 | 256 | APNIC | AU | 10th Jul 1996 |
| 203.29.82.0/23 | 512 | APNIC | AU | 10th Jul 1996 |
| 203.29.89.0/24 | 256 | APNIC | AU | 10th Jul 1996 |
| 203.29.92.0/24 | 256 | APNIC | AU | 10th Jul 1996 |
| 203.29.98.0/24 | 256 | APNIC | AU | 11th Jul 1996 |
| 203.3.0.0/18 | 16.4k | APNIC | AU | 28th Jan 1994 |