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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.131.28.0/23 | 512 | APNIC |  AU | 9th Jan 2001 |
| 192.131.30.0/24 | 256 | APNIC | AU | 9th Jan 2001 |
| 192.132.253.0/24 | 256 | APNIC | AU | 20th Nov 1991 |
| 192.140.232.0/22 | 1k | APNIC | AU | 5th Apr 2016 |
| 192.146.232.0/24 | 256 | APNIC | AU | 24th Jan 2011 |
| 192.146.252.0/24 | 256 | APNIC | AU | 8th Feb 1992 |
| 192.146.253.0/24 | 256 | APNIC | AU | 8th Feb 1992 |
| 192.147.235.0/24 | 256 | APNIC | AU | 20th Feb 1992 |
| 192.147.246.0/24 | 256 | APNIC | AU | 25th Feb 1992 |
| 192.148.230.0/24 | 256 | APNIC | AU | 4th Mar 1992 |
| 192.149.36.0/24 | 256 | APNIC | AU | 26th Feb 1992 |
| 192.150.130.0/24 | 256 | APNIC | AU | 13th Mar 1992 |
| 192.150.131.0/24 | 256 | APNIC | AU | 13th Mar 1992 |
| 192.150.132.0/24 | 256 | APNIC | AU | 13th Mar 1992 |
| 192.150.133.0/24 | 256 | APNIC | AU | 13th Mar 1992 |
| 192.150.134.0/24 | 256 | APNIC | AU | 13th Mar 1992 |
| 192.150.135.0/24 | 256 | APNIC | AU | 13th Mar 1992 |
| 192.150.136.0/24 | 256 | APNIC | AU | 7th Feb 2011 |
| 192.150.202.0/24 | 256 | APNIC | AU | 18th Mar 1992 |
| 192.150.234.0/23 | 512 | APNIC | AU | 20th Mar 1992 |
| 192.150.236.0/23 | 512 | APNIC | AU | 20th Mar 1992 |
| 192.189.159.0/24 | 256 | APNIC | AU | 11th Feb 2011 |
| 192.189.229.0/24 | 256 | APNIC | AU | 31st Jul 1992 |
| 192.189.230.0/24 | 256 | APNIC | AU | 24th Jan 2011 |
| 192.189.231.0/24 | 256 | APNIC | AU | 10th Feb 2011 |
| 192.189.232.0/24 | 256 | APNIC | AU | 7th Feb 2011 |
| 192.190.181.0/24 | 256 | APNIC | AU | 7th Aug 2025 |
| 192.190.208.0/24 | 256 | APNIC | AU | 30th Jun 1992 |
| 192.190.210.0/23 | 512 | APNIC | AU | 30th Jun 1992 |
| 192.190.212.0/22 | 1k | APNIC | AU | 30th Jun 1992 |
| 192.190.66.0/24 | 256 | APNIC | AU | 19th Jun 1992 |
| 192.195.102.0/24 | 256 | APNIC | AU | 21st Jul 1992 |
| 192.195.170.0/24 | 256 | APNIC | AU | 30th Jul 1992 |
| 192.203.176.0/24 | 256 | APNIC | AU | 18th Sept 1992 |
| 192.203.213.0/24 | 256 | APNIC | AU | 9th Oct 1992 |
| 192.203.235.0/24 | 256 | APNIC | AU | 23rd Nov 1992 |
| 192.207.113.0/24 | 256 | APNIC | AU | 25th Aug 1992 |
| 192.207.119.0/24 | 256 | APNIC | AU | 26th Aug 1992 |
| 192.207.161.0/24 | 256 | APNIC | AU | 4th Sept 1992 |
| 192.207.165.0/24 | 256 | APNIC | AU | 4th Sept 1992 |
| 192.207.33.0/24 | 256 | APNIC | AU | 18th Aug 1992 |
| 192.231.127.0/24 | 256 | APNIC | AU | 6th Oct 1992 |
| 192.231.136.0/24 | 256 | APNIC | AU | 8th Oct 1992 |
| 192.231.168.0/24 | 256 | APNIC | AU | 13th Oct 1992 |
| 192.231.212.0/24 | 256 | APNIC | AU | 20th Oct 1992 |
| 192.245.106.0/23 | 512 | APNIC | AU | 2nd Nov 1992 |
| 192.251.148.0/24 | 256 | APNIC | AU | 11th Feb 2011 |
| 192.26.216.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.217.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.218.0/23 | 512 | APNIC | AU | 17th May 1990 |