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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.28.177.0/24 | 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 |
| 203.28.58.0/23 | 512 | APNIC | AU | 14th 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 |
| 203.3.122.0/24 | 256 | APNIC | AU | 14th Mar 1994 |
| 203.3.128.0/23 | 512 | APNIC | AU | 14th Mar 1994 |
| 203.3.142.0/24 | 256 | APNIC | AU | 29th Mar 1994 |
| 203.3.152.0/22 | 1k | APNIC | AU | 14th Mar 1994 |
| 203.3.160.0/22 | 1k | APNIC | AU | 24th Mar 1994 |
| 203.3.78.0/24 | 256 | APNIC | AU | 4th Mar 1994 |
| 203.30.112.0/21 | 2k | APNIC | AU | 16th Aug 1996 |
| 203.30.135.0/24 | 256 | APNIC | AU | 19th Aug 1996 |
| 203.30.141.0/24 | 256 | APNIC | AU | 19th Aug 1996 |
| 203.30.161.0/24 | 256 | APNIC | AU | 20th Aug 1996 |
| 203.30.179.0/24 | 256 | APNIC | AU | 28th Aug 1996 |
| 203.30.18.0/24 | 256 | APNIC | AU | 23rd Jul 1996 |
| 203.30.192.0/24 | 256 | APNIC | AU | 30th Aug 1996 |
| 203.30.196.0/24 | 256 | APNIC | AU | 2nd Sept 1996 |
| 203.30.212.0/24 | 256 | APNIC | AU | 3rd Sept 1996 |
| 203.30.228.0/23 | 512 | APNIC | AU | 9th Sept 1996 |
| 203.30.231.0/24 | 256 | APNIC | AU | 10th Sept 1996 |
| 203.30.234.0/24 | 256 | APNIC | AU | 10th Sept 1996 |
| 203.30.239.0/24 | 256 | APNIC | AU | 16th Jun 2005 |