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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
2,381 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.136.100.0/22 | 1k | APNIC |  AU | 7th Mar 2019 |
| 103.136.140.0/24 | 256 | APNIC | AU | 11th Mar 2019 |
| 103.137.118.0/24 | 256 | APNIC | AU | 27th Mar 2019 |
| 103.138.210.0/24 | 256 | APNIC | AU | 7th May 2019 |
| 103.138.231.0/24 | 256 | APNIC | AU | 8th May 2019 |
| 103.139.63.0/24 | 256 | APNIC | AU | 16th May 2019 |
| 103.14.228.0/24 | 256 | APNIC | AU | 10th Aug 2012 |
| 103.14.25.0/24 | 256 | APNIC | AU | 17th Nov 2015 |
| 103.14.64.0/22 | 1k | APNIC | AU | 3rd Jul 2012 |
| 103.140.214.0/24 | 256 | APNIC | AU | 8th Jul 2019 |
| 103.140.222.0/23 | 512 | APNIC | AU | 8th Jul 2019 |
| 103.140.33.0/24 | 256 | APNIC | AU | 18th Jun 2019 |
| 103.140.58.0/23 | 512 | APNIC | AU | 20th Jun 2019 |
| 103.142.51.0/24 | 256 | APNIC | AU | 19th Aug 2019 |
| 103.143.60.0/23 | 512 | APNIC | AU | 17th Sept 2019 |
| 103.145.157.0/24 | 256 | APNIC | AU | 26th Nov 2019 |
| 103.146.6.0/23 | 512 | APNIC | AU | 9th May 2024 |
| 103.147.61.0/24 | 256 | APNIC | AU | 3rd Jan 2020 |
| 103.149.108.0/23 | 512 | APNIC | AU | 12th Mar 2020 |
| 103.149.184.0/23 | 512 | APNIC | AU | 19th Mar 2020 |
| 103.15.128.0/22 | 1k | APNIC | AU | 27th Aug 2012 |
| 103.15.178.0/24 | 256 | APNIC | AU | 3rd Sept 2012 |
| 103.15.72.0/23 | 512 | APNIC | AU | 20th Aug 2012 |
| 103.150.233.0/24 | 256 | APNIC | AU | 29th Apr 2020 |
| 103.150.39.0/24 | 256 | APNIC | AU | 7th Apr 2020 |
| 103.150.59.0/24 | 256 | APNIC | AU | 9th Apr 2020 |
| 103.151.175.0/24 | 256 | APNIC | AU | 26th May 2020 |
| 103.151.39.0/24 | 256 | APNIC | AU | 6th May 2020 |
| 103.153.109.0/24 | 256 | APNIC | AU | 17th Jul 2020 |
| 103.153.203.0/24 | 256 | APNIC | AU | 27th Jul 2020 |
| 103.153.47.0/24 | 256 | APNIC | AU | 13th Jul 2020 |
| 103.154.199.0/24 | 256 | APNIC | AU | 19th Aug 2020 |
| 103.156.199.0/24 | 256 | APNIC | AU | 30th Sept 2020 |
| 103.158.7.0/24 | 256 | APNIC | AU | 30th Oct 2020 |
| 103.161.229.0/24 | 256 | APNIC | AU | 19th Jan 2021 |
| 103.161.24.0/24 | 256 | APNIC | AU | 30th Dec 2020 |
| 103.162.96.0/23 | 512 | APNIC | AU | 3rd Feb 2021 |
| 103.164.82.0/24 | 256 | APNIC | AU | 16th Mar 2021 |
| 103.166.225.0/24 | 256 | APNIC | AU | 4th May 2021 |
| 103.17.216.0/22 | 1k | APNIC | AU | 6th Mar 2013 |
| 103.17.59.0/24 | 256 | APNIC | AU | 26th Feb 2013 |
| 103.172.133.0/24 | 256 | APNIC | AU | 30th Aug 2021 |
| 103.172.51.0/24 | 256 | APNIC | AU | 24th Aug 2021 |
| 103.174.227.0/24 | 256 | APNIC | AU | 21st Oct 2021 |
| 103.18.196.0/22 | 1k | APNIC | AU | 20th Mar 2013 |
| 103.18.241.0/24 | 256 | APNIC | AU | 25th Mar 2013 |
| 103.18.36.0/22 | 1k | APNIC | AU | 11th Mar 2013 |
| 103.18.52.0/23 | 512 | APNIC | AU | 12th Mar 2013 |
| 103.180.190.0/23 | 512 | APNIC | AU | 27th Jan 2022 |
| 103.180.208.0/23 | 512 | APNIC | AU | 28th Jan 2022 |