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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
2,394 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 130.195.224.0/20 | 4.1k | APNIC |  AU | 26th Sept 1988 |
| 131.185.0.0/16 | 65.5k | APNIC | AU | 3rd Jan 1989 |
| 134.18.0.0/16 | 65.5k | APNIC | AU | 13th Apr 1989 |
| 134.42.226.0/24 | 256 | APNIC | AU | 25th Apr 1989 |
| 137.59.168.0/22 | 1k | APNIC | AU | 5th Feb 2016 |
| 138.252.216.0/24 | 256 | APNIC | AU | 17th Nov 2025 |
| 138.252.250.0/23 | 512 | APNIC | AU | 19th Nov 2025 |
| 140.168.192.0/19 | 8.2k | APNIC | AU | 8th May 1990 |
| 140.168.248.0/23 | 512 | APNIC | AU | 8th May 1990 |
| 141.120.0.0/16 | 65.5k | APNIC | AU | 24th Jul 1990 |
| 143.174.128.0/18 | 16.4k | APNIC | AU | 1st Oct 1990 |
| 143.174.224.0/19 | 8.2k | APNIC | AU | 1st Oct 1990 |
| 144.48.140.0/22 | 1k | APNIC | AU | 14th Apr 2016 |
| 144.48.172.0/22 | 1k | APNIC | AU | 27th Jun 2019 |
| 144.48.244.0/22 | 1k | APNIC | AU | 21st Apr 2016 |
| 144.79.194.0/24 | 256 | APNIC | AU | 23rd Dec 2025 |
| 144.79.26.0/23 | 512 | APNIC | AU | 25th Nov 2025 |
| 144.97.0.0/16 | 65.5k | APNIC | AU | 28th Nov 1990 |
| 146.221.0.0/16 | 65.5k | APNIC | AU | 28th Feb 1991 |
| 146.88.144.0/23 | 512 | APNIC | AU | 28th Jan 1991 |
| 147.212.0.0/16 | 65.5k | APNIC | AU | 14th Feb 2011 |
| 148.145.0.0/17 | 32.8k | APNIC | AU | 18th Apr 1991 |
| 150.129.12.0/22 | 1k | APNIC | AU | 25th Jun 2014 |
| 150.151.0.0/16 | 65.5k | APNIC | AU | 20th May 1991 |
| 151.158.38.0/23 | 512 | APNIC | AU | 16th Jan 2026 |
| 151.158.40.0/23 | 512 | APNIC | AU | 16th Jan 2026 |
| 151.158.62.0/23 | 512 | APNIC | AU | 22nd Jan 2026 |
| 151.158.68.0/23 | 512 | APNIC | AU | 23rd Jan 2026 |
| 151.178.0.0/16 | 65.5k | APNIC | AU | 17th Sept 1991 |
| 152.147.0.0/16 | 65.5k | APNIC | AU | 23rd Aug 1991 |
| 154.8.120.0/22 | 1k | APNIC | AU | 5th Feb 1992 |
| 155.35.226.0/24 | 256 | APNIC | AU | 4th Feb 1992 |
| 155.71.0.0/16 | 65.5k | APNIC | AU | 30th Oct 1991 |
| 156.22.128.0/18 | 16.4k | APNIC | AU | 1st Nov 1991 |
| 156.22.192.0/19 | 8.2k | APNIC | AU | 1st Nov 1991 |
| 156.22.224.0/20 | 4.1k | APNIC | AU | 1st Nov 1991 |
| 157.15.167.0/24 | 256 | APNIC | AU | 8th Feb 2024 |
| 157.15.5.0/24 | 256 | APNIC | AU | 22nd Jan 2024 |
| 157.227.0.0/16 | 65.5k | APNIC | AU | 23rd Mar 1992 |
| 158.120.224.0/20 | 4.1k | APNIC | AU | 28th Feb 1992 |
| 159.73.0.0/16 | 65.5k | APNIC | AU | 17th Mar 1992 |
| 160.187.172.0/23 | 512 | APNIC | AU | 4th Oct 2024 |
| 160.22.145.0/24 | 256 | APNIC | AU | 13th Jun 2024 |
| 160.222.112.0/20 | 4.1k | APNIC | AU | 18th Jun 1992 |
| 160.222.128.0/20 | 4.1k | APNIC | AU | 18th Jun 1992 |
| 160.222.144.0/22 | 1k | APNIC | AU | 18th Jun 1992 |
| 160.222.148.0/22 | 1k | APNIC | AU | 18th Jun 1992 |
| 160.222.160.0/21 | 2k | APNIC | AU | 18th Jun 1992 |
| 160.222.168.0/21 | 2k | APNIC | AU | 18th Jun 1992 |
| 160.222.176.0/20 | 4.1k | APNIC | AU | 18th Jun 1992 |