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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks in Australia
2,391 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.0.84.0/22 | 1k | APNIC |  AU | 17th Sept 1993 |
| 203.0.92.0/22 | 1k | APNIC | AU | 17th Sept 1993 |
| 203.1.128.0/18 | 16.4k | APNIC | AU | 5th Nov 1993 |
| 203.1.222.0/24 | 256 | APNIC | AU | 24th Feb 2010 |
| 203.1.223.0/24 | 256 | APNIC | AU | 24th Feb 2010 |
| 203.1.24.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.29.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.3.0/24 | 256 | APNIC | AU | 29th Nov 1993 |
| 203.1.30.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.10.104.0/24 | 256 | APNIC | AU | 22nd Dec 1994 |
| 203.10.107.0/24 | 256 | APNIC | AU | 9th Oct 1995 |
| 203.10.111.0/24 | 256 | APNIC | AU | 23rd Dec 1994 |
| 203.10.32.0/24 | 256 | APNIC | AU | 18th Nov 1994 |
| 203.10.33.0/24 | 256 | APNIC | AU | 18th Nov 1994 |
| 203.10.78.0/24 | 256 | APNIC | AU | 14th Dec 1994 |
| 203.10.92.0/24 | 256 | APNIC | AU | 15th Dec 1994 |
| 203.10.93.0/24 | 256 | APNIC | AU | 21st Dec 1994 |
| 203.10.94.0/24 | 256 | APNIC | AU | 21st Dec 1994 |
| 203.11.104.0/22 | 1k | APNIC | AU | 12th Jan 1995 |
| 203.11.118.0/24 | 256 | APNIC | AU | 13th Jan 1995 |
| 203.11.119.0/24 | 256 | APNIC | AU | 13th Jan 1995 |
| 203.11.144.0/24 | 256 | APNIC | AU | 13th Jan 1995 |
| 203.11.168.0/21 | 2k | APNIC | AU | 15th Jan 1995 |
| 203.11.177.0/24 | 256 | APNIC | AU | 15th Jan 1995 |
| 203.11.178.0/23 | 512 | APNIC | AU | 15th Jan 1995 |
| 203.11.212.0/22 | 1k | APNIC | AU | 16th Jan 1995 |
| 203.11.64.0/24 | 256 | APNIC | AU | 23rd Dec 1994 |
| 203.110.248.0/22 | 1k | APNIC | AU | 7th Nov 1996 |
| 203.110.252.0/22 | 1k | APNIC | AU | 22nd Mar 1996 |
| 203.112.96.0/19 | 8.2k | APNIC | AU | 11th Apr 2011 |
| 203.118.243.0/24 | 256 | APNIC | AU | 28th Oct 2008 |
| 203.119.14.0/24 | 256 | APNIC | AU | 10th Feb 2004 |
| 203.119.21.0/24 | 256 | APNIC | AU | 18th Jan 2011 |
| 203.12.119.0/24 | 256 | APNIC | AU | 9th Feb 1995 |
| 203.12.122.0/23 | 512 | APNIC | AU | 13th Feb 1995 |
| 203.12.128.0/24 | 256 | APNIC | AU | 13th Feb 1995 |
| 203.12.192.0/24 | 256 | APNIC | AU | 16th Feb 1995 |
| 203.12.193.0/24 | 256 | APNIC | AU | 16th Feb 1995 |
| 203.12.212.0/22 | 1k | APNIC | AU | 16th Apr 2010 |
| 203.12.216.0/23 | 512 | APNIC | AU | 19th Sept 2010 |
| 203.12.250.0/24 | 256 | APNIC | AU | 23rd Feb 1995 |
| 203.12.38.0/24 | 256 | APNIC | AU | 23rd Jan 1995 |
| 203.12.42.0/24 | 256 | APNIC | AU | 23rd Jan 1995 |
| 203.12.67.0/24 | 256 | APNIC | AU | 2nd Feb 1995 |
| 203.12.72.0/21 | 2k | APNIC | AU | 1st Feb 1995 |
| 203.12.82.0/24 | 256 | APNIC | AU | 2nd Feb 1995 |
| 203.12.99.0/24 | 256 | APNIC | AU | 8th Feb 1995 |
| 203.122.64.0/19 | 8.2k | APNIC | AU | 12th Sept 2002 |
| 203.122.96.0/19 | 8.2k | APNIC | AU | 3rd Oct 2003 |
| 203.128.128.0/19 | 8.2k | APNIC | AU | 11th Apr 2011 |