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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 Singapore
528 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 1.21.224.0/19 | 8.2k | APNIC |  SG | 16th Jun 2010 |
| 1.32.128.0/18 | 16.4k | APNIC | SG | 5th Apr 2011 |
| 103.1.172.0/22 | 1k | APNIC | SG | 19th Apr 2011 |
| 103.1.84.0/22 | 1k | APNIC | SG | 18th Apr 2011 |
| 103.104.229.0/24 | 256 | APNIC | SG | 1st Dec 2017 |
| 103.107.42.0/24 | 256 | APNIC | SG | 8th Jan 2018 |
| 103.11.200.0/22 | 1k | APNIC | SG | 1st Nov 2011 |
| 103.116.90.0/23 | 512 | APNIC | SG | 30th May 2018 |
| 103.117.52.0/22 | 1k | APNIC | SG | 19th Jun 2018 |
| 103.120.247.0/24 | 256 | APNIC | SG | 13th Aug 2018 |
| 103.120.41.0/24 | 256 | APNIC | SG | 31st Jul 2018 |
| 103.125.83.0/24 | 256 | APNIC | SG | 16th Nov 2018 |
| 103.138.246.0/23 | 512 | APNIC | SG | 9th May 2019 |
| 103.151.176.0/24 | 256 | APNIC | SG | 26th May 2020 |
| 103.153.55.0/24 | 256 | APNIC | SG | 13th Jul 2020 |
| 103.157.120.0/23 | 512 | APNIC | SG | 19th Oct 2020 |
| 103.159.71.0/24 | 256 | APNIC | SG | 25th Nov 2020 |
| 103.162.254.0/24 | 256 | APNIC | SG | 17th Feb 2021 |
| 103.166.202.0/23 | 512 | APNIC | SG | 30th Apr 2021 |
| 103.166.238.0/23 | 512 | APNIC | SG | 5th May 2021 |
| 103.174.251.0/24 | 256 | APNIC | SG | 22nd Oct 2021 |
| 103.175.26.0/23 | 512 | APNIC | SG | 25th Oct 2021 |
| 103.178.4.0/23 | 512 | APNIC | SG | 14th Dec 2021 |
| 103.179.83.0/24 | 256 | APNIC | SG | 11th Jan 2022 |
| 103.19.82.0/23 | 512 | APNIC | SG | 2nd Apr 2013 |
| 103.194.230.0/23 | 512 | APNIC | SG | 19th Aug 2015 |
| 103.194.76.0/22 | 1k | APNIC | SG | 6th Aug 2015 |
| 103.195.32.0/22 | 1k | APNIC | SG | 4th Sept 2015 |
| 103.205.186.0/23 | 512 | APNIC | SG | 6th Jan 2016 |
| 103.206.30.0/23 | 512 | APNIC | SG | 11th Jan 2016 |
| 103.209.0.0/24 | 256 | APNIC | SG | 11th Feb 2016 |
| 103.209.120.0/22 | 1k | APNIC | SG | 18th Feb 2016 |
| 103.216.84.0/23 | 512 | APNIC | SG | 28th Apr 2016 |
| 103.222.238.0/24 | 256 | APNIC | SG | 6th Jun 2016 |
| 103.224.74.0/23 | 512 | APNIC | SG | 3rd Oct 2023 |
| 103.229.186.0/24 | 256 | APNIC | SG | 22nd Apr 2014 |
| 103.23.76.0/22 | 1k | APNIC | SG | 16th Jan 2012 |
| 103.231.220.0/23 | 512 | APNIC | SG | 20th May 2014 |
| 103.231.250.0/24 | 256 | APNIC | SG | 22nd May 2014 |
| 103.234.190.0/24 | 256 | APNIC | SG | 6th Jul 2023 |
| 103.236.119.0/24 | 256 | APNIC | SG | 14th Aug 2015 |
| 103.239.72.0/22 | 1k | APNIC | SG | 1st Aug 2014 |
| 103.24.164.0/22 | 1k | APNIC | SG | 17th Apr 2013 |
| 103.243.12.0/22 | 1k | APNIC | SG | 2nd Oct 2013 |
| 103.244.100.0/22 | 1k | APNIC | SG | 13th Dec 2012 |
| 103.245.223.0/24 | 256 | APNIC | SG | 24th Jan 2013 |
| 103.246.140.0/22 | 1k | APNIC | SG | 23rd Aug 2011 |
| 103.247.132.0/22 | 1k | APNIC | SG | 31st Jan 2012 |
| 103.247.180.0/24 | 256 | APNIC | SG | 25th Nov 2015 |
| 103.248.201.0/24 | 256 | APNIC | SG | 18th Sept 2023 |