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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.14.144.0/21 | 2k | APNIC |  AU | 28th Apr 1995 |
| 203.14.197.0/24 | 256 | APNIC | AU | 28th Apr 1995 |
| 203.14.210.0/23 | 512 | APNIC | AU | 3rd May 1995 |
| 203.14.224.0/22 | 1k | APNIC | AU | 8th May 1995 |
| 203.14.232.0/21 | 2k | APNIC | AU | 10th May 1995 |
| 203.14.35.0/24 | 256 | APNIC | AU | 10th Apr 1995 |
| 203.14.60.0/24 | 256 | APNIC | AU | 16th Apr 1995 |
| 203.14.68.0/24 | 256 | APNIC | AU | 6th Apr 1995 |
| 203.14.96.0/22 | 1k | APNIC | AU | 16th Apr 1995 |
| 203.143.91.0/24 | 256 | APNIC | AU | 19th Jul 2000 |
| 203.147.108.0/23 | 512 | APNIC | AU | 26th Mar 2008 |
| 203.148.94.0/23 | 512 | APNIC | AU | 4th Nov 2008 |
| 203.15.104.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.106.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.129.0/24 | 256 | APNIC | AU | 15th May 1995 |
| 203.15.139.0/24 | 256 | APNIC | AU | 16th May 1995 |
| 203.15.154.0/24 | 256 | APNIC | AU | 4th Dec 2008 |
| 203.15.176.0/20 | 4.1k | APNIC | AU | 19th May 1995 |
| 203.15.192.0/19 | 8.2k | APNIC | AU | 19th May 1995 |
| 203.15.228.0/22 | 1k | APNIC | AU | 21st May 1995 |
| 203.15.247.0/24 | 256 | APNIC | AU | 31st May 1995 |
| 203.15.69.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.71.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.72.0/22 | 1k | APNIC | AU | 13th May 1995 |
| 203.15.76.0/23 | 512 | APNIC | AU | 13th May 1995 |
| 203.15.78.0/23 | 512 | APNIC | AU | 13th May 1995 |
| 203.15.80.0/22 | 1k | APNIC | AU | 13th May 1995 |
| 203.15.84.0/23 | 512 | APNIC | AU | 13th May 1995 |
| 203.15.86.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.95.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.16.132.0/24 | 256 | APNIC | AU | 6th Jun 1995 |
| 203.16.168.0/24 | 256 | APNIC | AU | 7th Jun 1995 |
| 203.16.173.0/24 | 256 | APNIC | AU | 12th Jun 1995 |
| 203.16.176.0/24 | 256 | APNIC | AU | 12th Jun 1995 |
| 203.16.197.0/24 | 256 | APNIC | AU | 13th Jun 1995 |
| 203.16.198.0/24 | 256 | APNIC | AU | 13th Jun 1995 |
| 203.16.204.0/24 | 256 | APNIC | AU | 14th Jun 1995 |
| 203.161.182.0/24 | 256 | APNIC | AU | 24th Aug 2009 |
| 203.161.186.0/24 | 256 | APNIC | AU | 27th Aug 2009 |
| 203.167.24.0/22 | 1k | APNIC | AU | 25th Nov 2015 |
| 203.17.10.0/24 | 256 | APNIC | AU | 22nd Jun 1995 |
| 203.17.122.0/24 | 256 | APNIC | AU | 14th Jul 1995 |
| 203.17.140.0/22 | 1k | APNIC | AU | 14th Jul 1995 |
| 203.17.144.0/22 | 1k | APNIC | AU | 14th Jul 1995 |
| 203.17.153.0/24 | 256 | APNIC | AU | 15th Jul 1995 |
| 203.17.16.0/23 | 512 | APNIC | AU | 22nd Jun 1995 |
| 203.17.184.0/24 | 256 | APNIC | AU | 26th Jul 1995 |
| 203.17.196.0/22 | 1k | APNIC | AU | 26th Jul 1995 |
| 203.17.20.0/24 | 256 | APNIC | AU | 22nd Jun 1995 |
| 203.17.230.0/24 | 256 | APNIC | AU | 27th Jul 1995 |